Ultra-Long Exposure Photos and Digital Solargraphy

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More info: volzo.de/posts/digital-solarg...
Source code, CAD files, and everything else: github.com/volzotan/compresso...
Do you want to take long exposure images for days, weeks or even months?
Solargraphies (pinhole images on photograhic paper that capture months of the sun arching across the horizon) were a thing starting sometime in the 200Xs and this got a lot of people excited for film again. Quite a few people apparently started dropping cans with paper and pinholes in woods and the public urban space and I very much like this idea.
But how can we move the art of solargraphy into the digital domain?
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Timeline:
00:00 Introduction
01:20 Theory
02:57 The Problem
05:38 Dynamic Range
08:50 Hardware
10:30 Assembly
11:30 Results
12:44 A few remarks
13:45 Outro
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Blog: volzo.de
Twitter: / vlztn
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Music by Peyruis: / peyruismusic
Swing [CC BY]: / swing
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Analog solargraphy images by Willi Winzig [CC BY]: www.flickr.com/photos/9241710...

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Опубликовано:

30 июн 2024

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Комментарии : 30

@ab-hx8qe Год назад

3/3 videos I have watched have been excellent so far.

@EatRawGarlic 2 года назад

Sir, your videos are highly under-appreciated! Looking forward to more videos in the near future.

@springchickena1 2 года назад

I would feel it would be less appreciated if viewed a million times by people who don't care to fully understand. did you know fire, light, and sight are all inter-connected?

@dextrodus 2 года назад

That's cool stuff, you deserve a larger audience. I love how well that camera fits on that signpost, it's a really elegant solution to hiding a camera in plain sight. Also, as a felllow german I have a love/hate relationship with your accent. Ps. "BEAR with me" is pronounced more like the german Word bär, not Bier, unless you wanted us to enjoy a drink with you.

@vlztn 2 года назад

Being a non-native speaker is one of the (many) reasons why I care to offer subtitles ;)

@TusharPal93 Год назад

Side note, the camera enclosure looks amazing!!

@bluetran1 Год назад

Excellent video thank you

@billallen275 2 года назад

Wow, loved it, thanks! On my list of things to try... there's so many! Nice job with the camera!

@someguyontheinternet- Год назад

Excellent results

@bensneen Месяц назад

What a great video I have been looking at doing something like this with Raspberry Pi. No my thought process to would be if there is a program or a script you could use, that would mimic live view composite like on the Panasonic cameras. LVC takes a base photo which becomes your general exposure so all following photos just show changes in your environment without over sampling and overexposing you can look up making star trails with live view composite

@drewgossage8842 2 года назад

Great content! Presentation style is great, it reminds me of marcoreps. Looking forward to your new content👍👍 Thanks for sharing, all the way from Ipswich Australia.

@joanrue5169 Год назад

Absolutely cool! Flawless Victory!!!

@fotostyle1983 2 года назад

Wow! Perfect! Well done! No try half of year. :)

@gusatvoschiavon Год назад

great job

@OnnieKoski 11 месяцев назад

Very cool! I’ve made pi zero cameras in the past, but mostly I just stuck them in old broken cameras. I’d love to do a full 3D print like you’ve done, but I need to figure out how to control the camera settings using physical inputs. Like a dial for ISO and another for shutter speed. (I’ve already figured out push button to shoot, that was easy). GREAT VIDEO!

@gawaikerja1553 Месяц назад

amazing

@complexobjects Год назад

Really enjoyed this! Fascinating technique. I have a question: what exactly does w(i) indicate at 5:23? Is this value inversely proportional to the pixel’s brightness?

@vlztn Год назад

Yes, that's exactly what it is. I use the exposure value as a weight which is an inverse log scale. That's the code I use: ev = math.log(aperture / shutter, 2) - math.log(iso/100, 2) + EV_OFFSET

@hirsebrei90 Год назад

Volzo, great video on a great topic ;D I have a technical question about the exposure stacking: Instead of using a weighted average why not set a fixed exposure? As I understand the difference in exposures between images is "reversed" by the weight, right? Or will the result not be the same?

@vlztn Год назад

Fixed exposure = same exposure settings for each image? This would not capture the same dynamic range as you would loose all images exposed during morning and evening when the scene is too dark. That would be equivalent to doing a shorter overall exposure, like starting to capture at 9 and stopping at 16 o'clock. That does work, indeed, and saves a bit of hassle when doing the computation, but the images are much "flatter", you loose a lot of colours and you don't get the part of the sun's arc when it is just raising and setting above the horizon.

@hirsebrei90 Год назад

@@vlztn Ahh, okay I understand. Gonna make some test series to see what works best for me. P.S. Danke für die schnelle Hilfe ;)

@gw5976 2 года назад

amazing, really. do you think a small solar panel can power the operating system? in order to lengthen the periods of exposure.

@vlztn 2 года назад

Good point. Yes, it does work well with a medium-sized panel (about as large as a piece of paper). Even a few overcast days in a row are okay. But that does make the camera a lot more obvious, so I tested the solar prototype only on my balcony and did never actually put that to use.

@lindarose4870 2 года назад

Wow man you deserve more views where can I Download the 3D file is it PLA?

@vlztn 2 года назад

well, that's up to people (and the RU-vid algorithm) to spread the word... You can find all files here: github.com/volzotan/CompressorCam/tree/master/hardware I would recommend printing in PETG or something similar, PLA may deform after a few hours in direct sunlight.

@JoaquimGonsalves 2 года назад

Wow! This video is a rare gem! And it felt like I was listening to Einstein.🤩

@elvn4933 Год назад

Weimar!

@fotostyle1983 2 года назад

Ps. Can you sell me one of yours camera?

@vlztn 2 года назад

Thanks to the global chip shortage it's almost impossible to get the components for the controller board. So, no new solargraphy cameras in the near future, sorry.

@springchickena1 2 года назад

you made the mistake of buying sony. naturally will produce worse color from exposure to light its in the software