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"Ultra-Short Throw" Lens setup? (self.photography)

submitted 1 week ago by nickwitha_k to c/photography@lemmy.world

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A thought occurred to me that it would be nice to build a little webcam type thing onto a whiteboard. I recently became aware that Ultra-Short Throw video projectors, which are able to project a 254cm (100") diagonal image from only about 8cm (3") away are a thing that exists.

My question is: What sort of lenses come to mind to do the opposite? That is, take a rectangular surface that is very close and accurately capture it, with minimal distortion.

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[–] anguo@lemmy.ca 6 points 1 week ago

I would imagine it would be the exact same lens & mirror setup. Light goes both ways.

[–] colourlesspony@pawb.social 2 points 1 week ago (1 children)

I think you can just use a wide angle lens and convex mirror to get the same effect. Like a rear view car mirror or security mirror. I found image on google showing how it works.

[–] nickwitha_k 2 points 6 days ago

Awesome! Thank you! I'll have to think on this for a bit and see if I can figure out a way to use some of my spare parts to test.