DIY adapter - lens mount locking pin?

C

cgecko1219

New member
Hey all - first thread, been trolling around for a while, but I need to know:

especially for those of you with a DIY adapter, how does the lens lock in on your mount?

I'm using the home depot/edwierdo plans for this build and havent encountered anything regarding a locking pin for the lens to secure itself to the mount.

Without it, pulling focus is near impossible because it keeps detaching, and that is a bad thing. (I'm using a Nikon FG mount, btw)

Thanks, all
Chris
 
Chris,

at first i used a rear lens cap. With my DIY mid format adapter i went this route. For my DIY 35mm adapter for nikon lenses, i first started with a rear lenscap as well, but i made another using a "cannibalized" Nikon m2 extension tube which has a locking pin to prevent my lens from falling off.

Ted
 
yuo can always cannibalize one of the 2x converters (your choice of brand) for the lens mount. a lot more durable than the plastic from the rear lens caps.
 
sorry be so pressing, but budget's kind of tight lately.

Does anybody care to explain how to go about "cannibalizing" a 2x converter?
or maybe how to create something that does the same job for a lesser cost?
 
oh no worries. you just need to get your set of little screw drivers ready (hint: you can get the tiny ones fot $1 at the Dollar Store) and take the converter apart to where you can unscrew the metal mount. I don't think there's a step by step as each camera and converter is slightly different, but your goal is getting that mount off INTACT and so you can screw it on to your adapter.

"Creating" one of these mounts is difficult, if not impossible and the plastic from the end caps breaks at some point.
 
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from my understanding, isnt that the same process as taking a lens mount right off of an SLR? (which I have already done)

I'm still not clear on how to get the locking device secured to the adapter?
 
a lot of people don't already have a camera handy and buying one second hand/broken/for parts from ebay is usually sometimes a little more expensive than buying a 2x converter. 2x converter is simply an additional resource.

How you attach it is entirely up to the buil dof you radapter. I used 58mm Asian Spacer Tubes, co i screwed my mount onto a Cokin 58mm adapter. Now I can change mounts whenever I want. I'm sure other people have different methods, all depending on their own individual builds. You'll be creative and figure out what is best for your own purposes.
 
cgecko1219

If you remove the mount from the camera body and use that for your adaptrt, it is difficult to transfer the locking pin and pin release with springs since it is "buried" within the camera body.

Whereas if you use the extension tubes readily available all you have to do is remove the lenses if there is, a nikon m2 tube doesnt have glass element inside, and find the right screws to attache the whole thing. The locking pin is already part of the assembly.

Attached is a pic of 2 adapters i made. The one for RB645 uses a rear lens cap
cover with no locking mechanism (dangerous), the other uses a nikon m2 tube.
Much safer and sturdier.

Ted

1196946707.jpg
 
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