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This Instructable will help you build an adapter that allows you to make use of those old, film-based SLR camera lenses you have gathering dust in your basement. It also allows you to take pictures in an automated way (think time lapse, security or what I had in mind, a camera for entry level astrophotography). Gather up the following (many will have these laying around the house):
1) A working Raspberry Pi (you can choose the model you want, I had the RPI 2 model B, but I suspect you can use any model
2) RPI camera V2 (you might be able to use the V1, but I like the quality and features of the version 2). I picked the NOIR camera because I didn't want to filter out infrared on my astrophotography.
3) keyboard, monitor and power for the RPI. Google it. I would recommend an HDMI monitor, but I can understand using others.
4) An old camera lens. In my case, I used an old Olympus lens. The important thing is to have the REAR lens cap. But even if you don't have that lens cap, you should be able to find one at a local camera shop for pretty cheap.
5) A trap adapter - 1.5" (see picture) this is available at the local hardware store for a buck and some change. It includes two parts. If the one you find is too expensive, get the next size down. You might have to improvise some of the assembly though.
6) An old tripod that you don't use very often (don't worry, I won't cut it up).
7) Tiny plastic screws (x4) that fit the RPI Camera and nuts to match. My electronic store had these, but they might have them at a hardware store. If you have to use metal ones, you might want to put some electrical tape around them (pretty cozy, though). During experimentation, i used insulated wire.
8) A laundry detergent cap. I picked one that the plumbing part fits inside. I think you could also use a kitty litter cap.
9) A handful of zip-ties.

Step 1: Begin Prep Work - Drill Out the Lens Cap

Take the BACK lens cap and drill a hole into it. DO NOT HOLD THE CAP WITH YOUR HANDS WHILE DRILLING. At a minimum, use pliers. In my case, I drilled it out with a quarter inch drill bit and reamed it out further. It isn't terribly critical that it be super exactly centered and a huge hole, but try to be decent about it. Standard warnings - use the proper tools, use safety glasses, lock down the part (semi-gently) in a vise before drilling. The plastic can get hot when drilling.
<p>Great article!</p><p>I wish I had seen this about 2 years ago. That's when I sold my SLR camera and lenses on eBay-cheap. :(<br></p>
<p>If you keep the right flange focal distance for the lens you can use the focus ring on the lens. Also if you keep it and have a zoom lens you can change zoom without having to refocus. Should be easy to find, the distance is dependant on the lens mount.</p>
<p>Great point; I was eluding to that with the plumbing thread being coarse focus. But you get the point.</p>
<p>There is a simple way of flipping the image, as documented here:<br>https://www.raspberrypi.org/documentation/usage/camera/raspicam/raspistill.md<br><br>raspistill -o test.jpg<br> -&gt;<br>raspistill -vf -hf -o test.jpg</p>
<p>Good point. Otherwise, you have to train yourself to flip-flop your movements to center the picture.</p>
<p>X-Ray Film ( the solid black part that does not have the bone in it ) is PERFECT for a Solar Filter. Also PERFECT for viewing a Solar Eclipse!</p>
<p>As is exposed color film negative, like 35mm. I take no responsibility for any resulting retina damage, trauma to the patella, or other consequences of following random information found on the internet.</p>
Ok, but I wanted to go with &quot;safe&quot; material...had not heard of X-ray film...had heard of welder's glass, but again, not sure if it is as safe. Probably just paranoid. Very excited about the 8-21-17 eclipse!
<p>Fantastic!!! </p><p>Great Idea with the trap adapter! I wanted to do this since a long time, but didn't get far! Thanks for sharing!</p>
Hopefully, you can finish it now...I know the feeling...many unfinished projects here too.
<p>like it!</p>
Glad you like it...please vote for my instructable in the contests. Thabks.
<p>Very pretty shots :)</p>
Thanks!

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