making a pin-hole lens
A long long time ago, cameras utilized what we call a pin-hole lens. This was a close fitting lens without glass or plastic, but rather a tiny pin-pricked hole. There's a lot of careful math involved to create a good focal length and diameter, but I dislike math so I disregarded it entirely. I was initially inspired by my impatience to get a lens for a Nikon F3HP that I recently purchased, and wanted to see what quick alternatives there were. So, with my Canon DSLR as a test subject, I decided to try my hand at making a pinhole lens for fun.
I initially started off by tracing the lens cap on some scrap paper, and used it to cut a small disk of aluminum. Then, I wasted a ton of time looking for my misplaced calipers and ended up having to use this ancient piece of trash.
With that done, I went ahead and center-punched/drilled a hole at the center point i marked out.
Along with my misplaced calipers, was some misplaced foam, so I used a circle of white leather that I cut out instead to help seal light. I had black leather, which would have been best, but I was saving it for something else. After I cut it, I glued it to the back of the disk and clamped it.
I used a piece of aluminum tape to prick the hole in the center, though foil would have worked better. The adhesive actually marred the image. From then on, it was just a matter of adjusting the exposure, flash, and hole diameter. Being night, getting good images was difficult. I'll have to take it outside sometime.
stapler and pencil can behind a boxed bottle of ink
pictures framed with the light reflecting
the Nikon one touch and stapler
A little set back. This is 0.0 aperture...?
A closer view of the nikon and stapler. This was the best image, but as i was adjusting the hole size, i ruined it.
Edit: I used tin foil and got better results...Just need to adjust the size of the hole more and keep it as round as possible.
EDIT 2 - Glass lens upgrade
After adding the glass, i made the pinhole as small as i possibly could and took a 30 second exposure on ISO 800
Then i wanted to test its threshold for detail
30 seconds at ISO 800. Amazing.
just needs a lot of light