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Medium format m42 adapter? + reason...
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PostPosted: Wed Apr 30, 2014 10:17 am    Post subject: Medium format m42 adapter? + reason... Reply with quote
Is there any medium format system out there with a m42 adapter available?

Before you say why?... I'll answer - because I have adapted a whole bunch of vintage lenses from medium format folders into m42 to use with 35mm & full frame digital.

Lately I've wondered if I could adapt them onto 'modern' medium format film cameras like Bronica SQ-A or one of its contemporaries (hence the question about an adapter!).


PostPosted: Wed Apr 30, 2014 12:44 pm    Post subject: Reply with quote
There are Visoflex M39 adapters for Pentax 645, Pentax 6x7, Mamiya 645, Hasselblad and possible for other medium format cameras.
I'm not sure about Bronica.
With a M42->M39 adapter you can have a M42 mount for all those cameras (without infinity, of course).
You'll still need bellows or a focusing helicoid and M42 macro rings to focus the folder lenses.
If you want to have infinity focus check for the register distances of your lenses and the Visoflex register distance (Visoflex I - 91.3 mm) + M39->M42 adapter (~3 mm). That would give ~94.5 mm. and I'd say that only folder lenses with a FL greater then ~115 mm could be easily adapted this way.


PostPosted: Wed Apr 30, 2014 1:05 pm    Post subject: Reply with quote
Edited

Last edited by bernhardas on Sat Apr 02, 2016 8:03 pm; edited 1 time in total


PostPosted: Thu May 01, 2014 3:31 am    Post subject: Reply with quote
dan_ wrote:
There are Visoflex M39 adapters for Pentax 645, Pentax 6x7, Mamiya 645, Hasselblad and possible for other medium format cameras.
I'm not sure about Bronica.
With a M42->M39 adapter you can have a M42 mount for all those cameras (without infinity, of course).
You'll still need bellows or a focusing helicoid and M42 macro rings to focus the folder lenses.
If you want to have infinity focus check for the register distances of your lenses and the Visoflex register distance (Visoflex I - 91.3 mm) + M39->M42 adapter (~3 mm). That would give ~94.5 mm. and I'd say that only folder lenses with a FL greater then ~115 mm could be easily adapted this way.


Ah, m42 through m39 - that may do the trick. Definitely worth a try, cheers for that!

I've got plenty m42 helicoids/rings, so that part has already been taken care of.

I've also have an assortment of vintage shutter lenses which i have converted and I'm sure a few of them will work as i have to mount a few a lonnngggg way away from a 35mm format camera.


PostPosted: Thu May 01, 2014 3:37 am    Post subject: Reply with quote
bernhardas wrote:
My guess is that you might get some vignetting as the m42 diameter is a bit smaller than the medium format diameters.

I have never heard of an adapter but in these 3D printing times you never know.


Even though a lot of this glass is actually smaller than m42 in diameter, they are for the most part from medium and large format folders!

Hopefully these m42=>m39 adapters do the trick as i haven't had anything to do with 3d printing (yet...).


PostPosted: Thu May 01, 2014 7:59 am    Post subject: Reply with quote
For testing only, if a shorter register distance is needed, I'll make a hole in a body cup and glue a step-down larger diameter to M42 adapter ring in it. That would be really cheap and the normal 100-105 mm. 6x9 lenses could be focused to infinity, too.


PostPosted: Sat May 03, 2014 7:06 am    Post subject: Reply with quote
dan_ wrote:
For testing only, if a shorter register distance is needed, I'll make a hole in a body cup and glue a step-down larger diameter to M42 adapter ring in it. That would be really cheap and the normal 100-105 mm. 6x9 lenses could be focused to infinity, too.


Ah, the body cap adapter - I'm well accustomed to that one Smile


PostPosted: Tue May 13, 2014 11:42 am    Post subject: Reply with quote
It's your fun(eral), I am just saying ok?

Kiev for instance has register distance that is way way way more than m42.
Considering how infinity goes to 15 m by just a little too thick hama cradapter, I would estimate that, if mounted "standard" way (not recessed into camera), focus starts at like inches before the lens, if not in the lens.
For the same reason, smaller image circle from M42 will be non-issue, because it will be widened by implicit bellows.
Unfortunately this will also widen its resolution pitch, and if you started with a "lens" from a MF folding camera, it would maybe be cheaper to buy a lomo.

Just saying.


PostPosted: Tue May 13, 2014 1:06 pm    Post subject: Reply with quote
buerokratiehasser wrote:
It's your fun(eral), I am just saying ok?

Kiev for instance has register distance that is way way way more than m42.
Considering how infinity goes to 15 m by just a little too thick hama cradapter, I would estimate that, if mounted "standard" way (not recessed into camera), focus starts at like inches before the lens, if not in the lens.
For the same reason, smaller image circle from M42 will be non-issue, because it will be widened by implicit bellows.
Unfortunately this will also widen its resolution pitch, and if you started with a "lens" from a MF folding camera, it would maybe be cheaper to buy a lomo.

Just saying.


Cheaper? If I was looking for the cheapest option, I'd forget film and go digital. I'm searching for a certain and unique quality that comes with vintage glass.

As I've stated previously, my lenses aren't m42 format (only adapted to the m42 mount) therefore my 'register distance' isn't based on m42, but the particular original lens formats.


PostPosted: Tue May 13, 2014 1:15 pm    Post subject: Reply with quote
Sorry. With another register distance things change a lot, you are right.
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