Martin b
Allowing Ads
- Joined
- Apr 9, 2015
- Messages
- 3
- Format
- Sub 35mm
EDIT: I didn't see the sticky at the top, I've now posted this in that thread. Could a mod delete this please?
Hi all,
So I had a go at putting a large format lens on the Holga 120 Pan body. I was following the 'Making a HolgAgon' pdf guide that I downloaded ages ago, I've lost the original source but there's a copy on my blog post about the mod.
It was all pretty smooth sailing apart from focusing. I used a Graflex Optar instead of the Schneider Kreuznach 90mm mentioned in the pdf. I don't know if the flange distance is different between the two lens but I think with the 12-17mm focusing helicoid and the lens cap/adapter that the lens sits 2-3mm too far forward.
I tried with a 7mm macro ring instead of the helicoid and the lens then sits too close the film plane, so I reckon I'll go with the helicoid but try and move the M42 mount back a couple of mm, I'm just afraid the front of the camera is going to get messed up.
There's a few more pictures of the build here, along with several photos taken with the macro ring and helicoid at different f-stops showing the forward and back focusing problem.
Dead Link Removed
Cheers
Martin
Finished camera for now, until I have to chop into the front to try and move the mount backwards.
Focusing Helicoid at 12mm, f22
Hi all,
So I had a go at putting a large format lens on the Holga 120 Pan body. I was following the 'Making a HolgAgon' pdf guide that I downloaded ages ago, I've lost the original source but there's a copy on my blog post about the mod.
It was all pretty smooth sailing apart from focusing. I used a Graflex Optar instead of the Schneider Kreuznach 90mm mentioned in the pdf. I don't know if the flange distance is different between the two lens but I think with the 12-17mm focusing helicoid and the lens cap/adapter that the lens sits 2-3mm too far forward.
I tried with a 7mm macro ring instead of the helicoid and the lens then sits too close the film plane, so I reckon I'll go with the helicoid but try and move the M42 mount back a couple of mm, I'm just afraid the front of the camera is going to get messed up.
There's a few more pictures of the build here, along with several photos taken with the macro ring and helicoid at different f-stops showing the forward and back focusing problem.
Dead Link Removed
Cheers
Martin
Finished camera for now, until I have to chop into the front to try and move the mount backwards.
Focusing Helicoid at 12mm, f22
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