Views : 1,101,273
Genre: Science & Technology
Date of upload: Aug 6, 2018 ^^
Rating : 4.944 (416/29,438 LTDR)
RYD date created : 2022-04-09T04:54:37.368144Z
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Top Comments of this video!! :3
I'm a photographer and I definitely wouldn't consider 22:48 underexposed. Even the pre-toned one looked acceptable to me. You definitely lost plenty of contrast and thus some detail in the highlights, but if you'd exposed it any more, I think you'd have lost the detail in the storefronts and buildings (which comprises the majority of the composition). I think it looks quite nice.
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In chemistry-based photography there is the idea of reciprocity, where exposing film or paper for twice as long at half brightness will give the same exposure. ISO 200 film at 1/500th second is the same as ISO 100 at 1/250th.
But in really long exposures, on the order of above a minute, there is "reciprocity failure": a ten minute exposure isn't the same as a fie minute exposure one stop down. From your experiment it seems like that may apply to cyanotypes too.
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I really love the trial & error aspect of your videos , it feels a lot more organic and is much more entertaining to watch since it's more of an amateur experiment then it is a lecture ( and i use the word amateur really loosely cause clearly you know your science ).
That's why i love your channel and cody's so much , keep it up man !
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In the final scene, did you just expose FAC coated paper and then brush on PF? That's allegedly how Herschel did it though we haven't tried ourselves.
Very enjoyable series seeing you come at it from a different angle. If you try other recipes doing your first rinse in 1% Citric Acid lowers the contrast and helps other tones to the party. There are also a few published curves for Photoshop to adjust the tones for better representation. A Photoshop script called Chartthrob (Free) can be used to generate your own curves.
Lastly, we never have luck making laser digital negatives. Inkjet is much better but make a test to see which color ink in your printer blocks the most UV. Reddish orange Canon inks work much better than black for us.
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@Qwerasd
5 years ago
Your description of making coffee is very scientific.
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