Digital Pinhole Camera for free

Posted February 10th, 2011 by ch3ka

This is a pinhole "glass" for canon EOS:

well, not yet.

But this is:

(those are all full-res images. right click and "view image" to view fullsized)

Howdunit?

First, we have to carefully determine the center of the bodycap:

then we drill a hole:

We remove the sharp edges:

And polish, until it looks like this:

Then we cut a hole in a square of gaffers tape:

and cut a square of aluminium foil - slightly larger than the hole in the gaffers tape:

putting it together:

and place it in the body cap:

now comes the critical part: pinning the hole with a needle.
we need approx. 0.2mm diameter, exactly round shaped, and in the very center of the "lens".

When we failed to achieve that, it might look like this:

Almost done! We add an impromtu lens-cap :)

and mount the "glass" on the camera:

ok, looks good... but can it make pictures?
See the red blanket on the sofa behind the camera?
That's where I placed the test subject: a little marsupilami.

Surprisingly enough, I was able to actually see something like an image in the viewfinder, yet extremely dark.
It was merely more than a little aid to aim the camera.

I also got - surprisingly enough - a lightmeter reading from the camera which told me I should dial in 8 seconds for "perfect exposure, evaluative metered", so I did.
This came out:

So something like 2 stops to dark.
I tried again with 30 seconds:

better, but still a bit too dark. you can already tell by the histogram, that the tonal range of this "lens" is very, very limited. And as far as the IQ goes... its... not even "soft" ;)
but this was expected, and I'm sure one can get fine experimental or surrealistic results w/ this lens.

well: here are exposures of 1,2, and 4 minutes, and their histograms:
1min:

2min:

4min:

possible improvements:
- really center the hole - mine is like 0.3mm off
- thinner hole - the needle had a diameter of .25mm by itself, yet we need a .19mm hole for perfect focus at this distance from the sensor
- increase focal length - when we go further away from the sensor, both our best pinhole diameter and the allowed errors increase
- thinner material - the hole should be as thin as possible, even aluminium foil is ~2x too thick
- better shaped hole - we do not have a circle here, as we literally *punched* through the foil

If you liked this, buy me a beer and / or comment below

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