Build: A calibrated white light sensitometer

reneboehmer · 2026-03-20T12:43:02-0400

ic-racer said:
Thank you for sharing this detailed and well thought out project.

Thank you!

reneboehmer · 2026-03-20T12:45:02-0400

Bill Burk said:
I think the LCD would be great for it. Having seen ic-racer’s sensitometer shootout and seeing significant latent image degradation effects, I think marking timestamp is more critical than light source falling short of ideal.

A standalone edge stamper would be good too

Yes we thought about a 0.9 inch oled display board from aliexpress. It could show custom information.

reneboehmer · 2026-03-20T13:23:24-0400

ic-racer said:
Can you show the light box?

bernard_L · 2026-03-20T13:28:04-0400

reneboehmer said:
I have slight falloff to the very left and right, because the leds are not longer than the illumianted surface.

You might remedy this by making the left and right walls out of mirrors, creating virtual LEDs to the left and right, without increasing the physical width of your box.

reneboehmer · 2026-03-20T13:30:44-0400

bernard_L said:
You might remedy this by making the left and right walls out of mirrors, creating virtual LEDs to the left and right, without increasing the physical width of your box.

Thats a good idea and easy to try, ill order some small mirrors and try.

Build: A calibrated white light sensitometer

reneboehmer

reneboehmer

reneboehmer

bernard_L

reneboehmer

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