Holga 120 Pan + 90mm Graflex Optar, my attempt at a 6x12

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

nice stuff