Showing posts with label Moon. Show all posts
Showing posts with label Moon. Show all posts

Saturday 24 July 2021

The Best Laid Plans of Mice and Men

So I've been playing about a bit with PhotoPills recently, a really geeky photographer's planning App. There's a steep learning curve, but once you've got the gist of it, it's really quite useful, particularly for sun/moon-set/rise shots and astrophotograpy. I'm not a huge fan of shooting the full moon - it can be a bit bland because the crater shadows are so short (like shooting terrestrially at noon), but if the moon is positioned well, it can still give usable results.

Full Moon and Kloster Andechs | Olympus 400 mm, f/6.3. 1/2 s ± 2 stops, ISO 400
Back in June I already tried shooting the full moon rising behind Kloster Andechs, a local landmark. Unfortunately I got my planning slightly off, meaning that the moon was much further south of the monastery than I'd envisioned, it was a day past full moon due to cloud cover the night before and despite having clear skies at home, there was a cloud bank low on the horizon to the east, obscuring the view and it was quite dark.

Obscured by Clouds | Olympus 123 mm, f/5.7. 60 s, ISO 400
Back home I went over the PhotoPills planning again and found out what my problem was. There are a number of variables that have to be entered; position of the subject, position of the photographer, time, etc. The App determines the distance between the two as well as the elevation distance and you can then select the precise time at which the moon will be at the correct elevation and work out the optimal place to stand in order to fine-tune the position to shoot from. It turned out that I'd taken the elevation into account and then used the wrong line in the map - the one 

Come July and the full moon fell on a Friday again, always good for a late shoot, plus moonrise was 8 minutes after sunset, meaning that there would still be a significant amount of ambient light to shoot with; it wouldn't just be a bright moon against a dark background (đŸ„±). Back in PhotoPills I realised that I'd forgotten all the steps necessary to plan the shoot, so it was back to their helpful YouTube tutorial for a quick refresher.

  1. Subject to be photographed
  2. Standpoint to shoot from
  3. Second panel of Planner
  4. Altitude difference standpoint ⇾ subject
  5. Dial in Moon height using time slider (8)
  6. Line indicating direction of moonrise
  7. Line indicating direction of moon at selected time
  8. Time slider (magnified view).

Slide the time slider back and forth to give the correct elevation to match the altitude difference (4) and then reposition the standpoint pin (2) to position the moon direction line (7). Simples!
Getting into position about a half-hour ahead of time we discovered that the place on the lake shore that we'd worked out in the App was obscured by 2 m high reeds and so we backtracked 150 m north to just outside the Wasserwacht by the Pavillion at Utting. Waiting for the moon to appear we scanned around us for other motives. The sky colours were getting really pretty and pastelly at this stage and so I whipped out the smartphone for this grab. Actually one of my favourite of the evening in the end.

Pastel Tones | Huawei P30 Pro Smartphone
Moonrise came and went and we didn't see anything. Check the App. Oh yes, we have to wait for it to rise sufficiently to be seen behind the 173 m higher horizon to the east. I'd figured that into the planning, but I'd been looking at the moonrise time rather then the time that I'd dialled into PhotoPills. Bang on 21:33 we saw a red-pink glow on the horizon north of the monastery. Our move to a clearer spot had pushed the moon further north than I'd hoped for.

Ah, There She Is! | Olympus 150 mm, f/5.7. 1/3 s, ISO 400 
Starting with the moon 'upstream' of the monastery was much better than downstream, however, since it could only move into constellation and not out of to start with. It was now a waiting game, waiting for the moon to come into a good position, adjusting the tripod position every now and then to make sure the reflection of the moon's light was unobstructed - it would have been messy to have it interrupted by the boats or jetty at this stage. Avoiding this meant repositioning the tripod every five minutes or so.

Moon and Andechs | Olympus 138 mm, f/5.7. 1/2 s, ISO 400

With  as spectacle like this, we weren't the only 'togs out of course. Not sure whether this chap was a planner or an opportunist staying at the local campsite. I always go out of my way and exchange a few friendly words with anyone out shooting. I seem to get two types of reaction; folks are either really ultra friendly and chatty or they give the impression that you're treading on their toes, poaching their photos. It isn't a competition and generally we can only learn from each other. I'm always happy to promote other's photos on social media too if I see merit that deserves sharing. We need to be building each other up, not tearing each other down.

Photographer's Paradise | Olympus 169 mm, f/5.8. 0.8 s ± 2 stops, ISO 400
As we watched the moon rise, we could see the transition in colour from red to orange to yellow. Just like the sun, the more atmosphere the light reflecting from the sun has to travel through, the redder it appears as the shorter wavelengths of light get bounced off into space. Now we could zoom in with the Olympus f/5.6 100-400 to catch a couple of full frame images. Believe it or not, I've toned down the saturation of the moon here as it looked simply too artificial.

Moon and Andechs: Exposure Blend | Olympus 400 mm, f/6.3. 0.8 s ± 2 stops, ISO 400
As the distance between moon and monastery increased, so the size of the two elements in the picture as I had to zoom out as well as the contrast in brightness as dusk slowly arrived. Our work here was done. Almost. Sharon actually spotted this composition of the light playing on the water next to the jetty. And with that we were done.

Moonglow Reflected | Olympus 400 mm, f/6.3. 1 s, ISO 400
Do you have a subject that you'd like to shoot at full moon some time? Want some help planning exactly when and where to stand to take that shot instead of using trial and error? Drop me a line and we'll see if we can set you up.




Sunday 28 June 2020

In Seach of the Milky Way - From Dusk 'Til Dawn in the AllgÀu

At the end of May I scouted a possible location for an astro shoot in the AllgÀu mountains come next new moon. A good milky way photos lives and dies by the foreground and I wanted somewhere with a good view over the alps. The middle of June arrived and the forecast for Friday and Saturday was awful; clouds, rain, the lot. Nothing doing. The next weather window was going to be Tuesday night. To make matters worse, the initiator of the whole idea - my friend Matthias - couldn't make it as he was stuck up at work in northern Bavaria. But an old school friend who happens to live in Munich was interested enough to bite when I announced my intentions on Facebook and so Martin and I ended up heading down to Fischen im AllgÀu early Tuesday evening to see what we could see. Meteorologically we were on a rising tide - there were still some clouds around but the weather was definitely clearing from the north and so we were optimistic.

The Shoot


Waiting For The Moon To Set || Huawei P30 Pro


Dusk

Driving down there were still cloud remnants lurking in all the wrong places, but the northerly wind was driving them deeper into the alps and so we weren't too concerned. We set off from the car-park in the early evening light. Normally, like most people, I spend most of my time in the mountains during the day. Unless I'm staying in one of the mountain huts, I'm generally back down in the valley for dinner. This evening's experience may get me to revisit that schedule. There's a good reason why landscape photographers choose to shoot at the ends of the day; the light quality is very different. It's softer, gentler and less blue. Watching the pastel colours changing on the Vorarlberg mountains in the gathering dusk made me start rethinking how I plan my days in the Alps.

As the Sun Goes Down || Olympus f/7.1, 1/80 s, ISO 200

It was great to see that not all of the snow had disappeared in the intervening weeks; I find the last snowfields really make a photo like this and I don't shy back from exaggerating them in post-processing like  here (above).

The Pastel Colours of Evening || Olympus f/7.1, 1/160 s, ISO 200

All the Layers || Olympus f/7.1, 1/30 s, ISO 200


Moonset

I'd promised my school chum a relatively easy hike up to the first mountain top that I'd identified. Unfortunately we didn't make it all the way and ended up about 100 m below the summit on a slight shoulder. The location was optimal for the first spectacle of the evening - the fresh new moon was due to set behind the peak above us and our location appeared to be optimal for that. My smartphone app (Sky View) was showing me where the moon should be in the sky, but for the life of me I couldn't find it. I was beginning to fret that either (a) the app was playing up, or (b) there wasn't going to be enough moon to see. As the sky darkened and I still couldn't see it Martin spotted it - why we hadn't seen it before was a complete mystery as it was so clear at this point.

Well It's Obvious Now! || Olympus f/8, 1/5 s, ISO 200


Setting Moon || Olympus 100 mm f/5.6, 0.6 s, ISO 400

Before we turned our attention to the stars that were beginning to appear in twos and threes there was one more dusk photo to grab before the technical stuff began:

When Purple Comes Out To Play || Olympus f/5.6, 40 s, ISO 200

As fun as it was to shoot the setting moon, it cost me my first milky way shots as I wasn't set up to get a good foreground photo during the blue hour that I could use to blend into the final image in post. The shot I ended up getting was ok, probably one of my better photos of the Milky Way per se, but the foreground is lacklustre. I don't know whether it would have been any better 100 m higher up either, but the lesson is that you need to be in position early, you need to get your foreground shots in in good time and you can only recon on about two good astro shots per night, one after the sun goes down and one before it rises, unless you're shooting with multiple cameras.

Collision Imminent || Olympus 300 mm f/5.6, 0.6 s, ISO 1600, Composite Image

Milky Way

The challenge with astrophography is the low light levels. You need an open aperture and relatively high ISO with a wide angle lens to get enough light to the sensor before the earth's rotation turns the star points into lines - the so-called star trails. As a rule of thumb, the maximum exposure time before this happens is 500/focal length* (400 if you're being conservative). So for my 16 mm equivalent wide angle lens, I can shoot for 25 s. In order to further increase light-sensitivity, we need to increase the ISO. Small sensor cameras (I shoot with an Olympus micro four-thirds crop sensor, technically a small sensor camera) are notorious for being sensitive to high ISO, the images tend to have a lot of unsightly noise - a random phenomenon that causes an unsightly buzz in the image. But being random, there's a solution: If you take multiple shots and then take the average of those shots, the noise is diminished. The challenge is that the software performing the calculations needs to take into account the fact that the stars are moving - if it didn't you'd end up with the trails again. All in all quite a technical feat, especially when there's a foreground involved. Fortunately the free Windows software Sequator can do all of this - it's what it was written for. It's not the most user-friendly app, but if you know what you're doing (or in my case if you know someone who knows what they're doing), it's extremely powerful. The trick seems to be not using too many of the features, but more of that below.
*25 mm equivalent, so with my micro four-thirds sensor I need to double my focal length

First Starlight - Stacked but Unprocessed || Olympus 8 mm, f/2.8, 25 s, ISO 6400, Stacked

We could just about make out the trail of the Milky Way in the AllgĂ€u sky. From our vantage point I tried several series of shots, with and without my Haida Clear Light filter and Tiffen Fog filter and with the new 7Artisans 7.5 mm fish-eye. In the end I liked the unfiltered images through the Panasonic Leica 8-18 mm the best. The above image is stacked to reduce noise but otherwise unprocessed. The sheer clarity of the image just blows me away. The detail in the Milky Way is amazing. But I don't think this is a good Milky Way photo. It's a good photo of the Milky Way, but like I said earlier, a good Milky Way photo stands or falls by the foreground and I wasn't satisfied with what I was getting here, so after a cup of tea  and a pasty (thanks Martin, those were life-savers) I lay down for a 45 min shut-eye before heading up to the ridge, where I knew just the spot.

With Haido Clear Sky Filter, Unprocessed

7Artisans 7.5 mm Fish-eye Lens, Unprocessed

One of the greatest challenges with astro photography is finding infinity on the focus dial. Looking through the viewfinder you're confronted with an almost completely black image - finding something to focus on can be extremely difficult. If there's a bright light a couple of miles off this works relatively well, as at this distance there's effectively no focal change between 2 miles and infinity. It was quite a challenge in the dark though, and I had to hunt through the magnified viewfinder on the Olympus to locate Jupiter (bright spot in the middle of the images above) and twiddle the focus ring of the lens to render the tiny fuzzy light as tight and small as possible. Then it's shoot and hope. You can examine the images on the camera display, but you're never entirely sure whether your photo is sharp or not until you get the image on the computer screen.

Despite being pitch dark, it was easy enough to find my way by the light of my head-torch, having scouted the area less than a month before. I located the second spot relatively easily and set up the tripod again. A few ultra-high-ISO shots helped me frame the photo correctly. I also tried some low ISO long exposures with a bit of light painting so that I would have a foreground to go with it. This is a separate image that is blended with the processed astro image in post processing (see last image). This final photo here has to be my favourite image of the year so far. I didn't get a huge number of finished shots that I was happy with, but at the end of the day, if you come away with at least one, that's a win.

Milky Way Over The AllgÀu || Olympus 8 mm, f/2.8, 25 s ISO 6400, Stacked

I carried on shooting for a while after this into the blue light of pre-dawn before giving up and catching a few more minutes sleep lent against my rucksack. It was a mild night with little wind and the ground was comfortable and dry beneath me, not a sound to be heard.

Birdsong and a yipping fox in the valley below alerted me to the coming dawn. By the light of the red band of cloud to the east I could just make out a small peat pond nearby that I'd just avoided in the dark. In retrospect I should have taken a lower vantage point for this shot. This is two images blended in ON1 Photo Raw, one for the sky, one for the foreground. I took the liberty of brightening the tufts of cotton grass to emphasise them in the pre-dawn light.

Mountain Tarn at Dawn || Olympus f/5.6, 1/6 s, ISO 200

Then it was down to find Martin and head down to the car. I found him warming himself over his camping stove and ready to return to the valley. As I waited for him to pack his things there was time for one last shot of the sun rising on the mountain escarpment opposite us. 

The Red Light Of Dawn || Olympus f/5.6, 1/30 s, ISO 200

Processing the Images

If you're not interested in the nitty-gritty of processing astro photography you can probably stop reading here and scan to the last images. It's very easy to over-process Milky Way photos: I spent two evenings working on this last shot only to have Sharon (correctly) tell me that it was too speckled and she didn't like the foreground. I've left this technical bit to the end for my techie friends who'll be interested in this stuff (hi Matthias!). 

Before the images can be 'stacked' (averaged), they need to be in tiff format. ON1 Photo Raw, my post-processing software can export tiffs, but they're the wrong format for my stacking software, Sequator. The images have to be opened in Olympus Workspace and exported as tiffs from there. For each image I used 10 star images and two control images with the lens cap on (lights and darks respectively).

Crop of main image


 

Unprocessed image OOCStacked in Sequator
10 Star images, 2 Noise images (with lens cap on), Align stars, Freeze ground, Sky region: Partial, otherwise all default settings
Processed in ON1 Photo Raw 2020
Develop:
Contrast +24, Highlights +18, Midtones +15, Shadows -20, Whites +45, Temperature +40, Tint -3
Effects:
Sharpening, Noise Reduction (Moderate), Tone Enhancer (Shadows Lighter on foreground; Midtone Contrast Boost, 50%), LUTs (1983, 35%), Sunshine (Sunglow, 50%), Curves (mild S-curve), Dynamic contrast on Milky Way


I also tried a blend of my favourite image with the light-painted foreground in ON1 Photo Raw. It's not perfect as I seem to have adjusted the camera between frames and had to stretch the resulting images to fit. I'd be interested to hear which image you prefer, this one with more detail in the foreground trees, or the original "Milky Way Over The AllgÀu" above. My jury is still out on this one.

Milky Way Over The AllgÀu II || Olympus 8 mm, f/2.8, 25 s ISO 6400, Stacked and Blended


Friday 5 June 2020

Moonshots - Getting the Shot and Post-Processing

Who doesn't want to take cracking images of the moon, our closest celestial object? We've all seen startlingly bright photos of the craters and then perhaps gone out to try to make our own and come back disappointed with black photos containing a bright, blurry smear in the middle. With a little bit of know-how and a decent-length lens it's not too difficult to get images that will stun our friends. There are two important steps: getting the images in the camera and then processing the pictures on the PC. 

Moonrise over the AllgÀu || Olympus f/8, 1/1250 s, ISO 200


Some phases of the moon are definitely more photogenic than others. When the sun hits the moon obliquely, like here at just after half moon, the shadows on the craters are longer and stand out more. At full moon the sun is full-on and the shadows shrink. This was one of those 'oh wow' moments that I knew I had to capitalise on. We were sitting outside at a restaurant in the mountains when one of the kids noticed the moon rising over the hillside. I had to dash to the car to grab my telephoto lens and was able to capture this image before the moon became too high above the hillside.

Getting the Images

All the images in this article were taken using my Panasonic Lumix 100-300 mm lens at the long end on my Olympus E-M1 Mk II, a micro four thirds camera, making this equivalent to a 200-600 mm lens in 35 mm terms. Without image stabilisation we need to watch out for the shutter speed / focal length rule (maximum shutter speed = 1/ focal length; for a 500 mm lens, for example, the max shutter speed should be 1/500 s). 

The next challenge is getting the exposure right. Most cameras are set to evaluate the exposure over the whole image, combine this with some intelligent guess-work and provide you with what your camera thinks is a suitably exposed image. So for an image of the moon your camera sees a bright spot - even at 600 mm FF equivalent we're talking about an area that probably takes up less than 5% of the image - against a dark background and will try to provide you with an images that balances the light and dark.

Exposure

So we have to trick the camera or even go to manual. If you know how to adjust your exposure with exposure value (EV) adjustment - experience tells me that setting your camera to -3 EV should give you a decently lit image. Alternatively, you can go manual. The night images were taken at 1/640 s at f/5.6 and ISO 200 on my Olympus. You could try starting from there and adjusting the exposure as needed.

Even though you can hand-hold these shots, there is one significant advantage to sticking your camera on a tripod; aligning your images in post will be much easier.

Focus

Sticking your camera on a tripod also makes focusing your shot easier, and I really would recommend slipping into manual focus for this to be on the safe side. If your camera allows you to magnify around the focus point then use this, in fact use every trick you can to get the image as sharp as you possibly can. Don't leave anything to chance. What you'll notice is that the moon won't stay still on your camera display. Don't worry, your camera isn't slipping on the tripod mount (well, it might be, but not necessarily). What you're seeing is the moon moving in relation to the earth.

Multiple Exposures

Why images and why align them? Because a single image isn't going to give you much of an picture. In fact, you're going to want to grab at least about 50 images. This will give you enough to generate a mean image in post (colloquially and mathematically) reducing noise and sharpening the image. The atmosphere is full of convection currents, particularly in the summer, which will muddy your image.

Processing the Images

Ok, so the fun part is over, now the work begins. First we need to do a little bit of basic editing in your post-processing software of choice. I make no apologies for using a slightly obscure programme for mine; ON1 Photo Raw 2020 instead of Lightroom or Photoshop for the same reason I make no apologies for shooting with an Olympus rather than Canon, Nikon or Sony. They're informed decisions that I made and stand by - I've never been afraid of going down the road less travelled.

Initial Processing

Import your RAW images into your processor of choice and select the images from your series. Most image processing programmes allow you to apply the settings you apply to one photo to a series of photos, so you can hopefully just edit one and cascade to the other images. Crop your image to the final size you want for the image, allowing room around the edges for a final crop. You may want to increase the basic exposure and clarity, but don't over-do it and leave the noise reduction for now, we'll get back to that later.  Apply the crop and adjustments across the whole series and export them all to tiff or jpeg files in a dedicated folder for stacking.

Image Stacking

You will probably have noticed that your photos are a little muddy, a little unclear. That's perfectly allowable; your subject is at least 384,000 km away and you're shooting through 480+ km of air. That air is seldom clean and often full of convection currents, making matters worse. Stacking your images will give you a mathematical mean image, reducing image noise and sharpening the details.

The software I use is a free programme called RegiStax 6 and can be downloaded from the website here. The programme will first align the various images - like I said, the moon will be in a slightly different place each time due to the relative motion of the earth and its satellite. Before the images can be averaged, they need to be lined up. After that, you can select what percentage of the base images you want to use for the averaging before stacking.

Rather than list the specific steps I used and palm them off as my own, I'll point you to the Sarah and Colins Astro YouTube video that I followed verbatim. After aligning the images, there will still not be much difference from the original until you adjust what the programme calls 'wavelets'. Then the magic happens and the crisp image begins to reveal itself. 

I had problems using tiffs; firstly the tiffs I generated from ON1 weren't recognised by RegiStax. The tiffs from Olympus Workspace were recognised, but the resulting image had a lot of digital noise. My best results were from Olympus RAW files exported to jpeg in ON1 Photo Raw. The output from RegiStax can be saved in any of the usual formats, though if you've used jpeg as the starting point for stacking, you possibly won't gain anything by saving the output in any of the information richer formats.

Final Processing

Now it's time for the last polish. Re-open the image in your image processing software. It's likely to have quite a bit of noise in the smoother parts of the image and it's now time to deal with that and any other adjustments you might care to make.

In ON1 I dealt with noise using Luminance 2020 Noise reduction, setting Luminance to 30 and Detail to 5. Your mileage will of course differ. I loose a little bit of detail like this, but it's a sacrifice I'm prepared to make to get rid of the unsightly noise.

Watch the craters at the bottom of the moon as well as the noise in the Sea of Tranquillity (the darker patch towards the top).


 

Starting Image



 

After Stacking


 

After Noise Reduction



Layers

As a last step, you may want to assemble the final image(s) in layers. This will let you plant your final moonshot back in its environment as with my Moonrise over the AllgĂ€u shot at the beginning of this article. I used this process to slightly magnify the moon in this scene to emphasise it. 

What Next?

If you found this tutorial useful, link to your final image(s) below, it would be great to see them. 

If you're still looking for a challenge? Go and take a look at Alyn Wallace's YouTube tutorial on taking gorgeous HDR images of the half moon.

I'll close with two more before and after pics taken later that evening from home to emphasise how much detail can be wrung out of these images. I had to add a gaussian blur to the background on the stacked image due to an ugly moire pattern, but that's trivial.


Later the Same Night: Before || Olympus f/5.6, 1/320 s, ISO 200

Later the Same Night: After || Olympus f/5.6, 1/320 s, ISO 200