80mm lens with smallest diameters

[bill_glickman]

I am trying to mount two modern 80mm (or 70mm)lenses side by side on a LF lens board for shooting stereo. My goal is to find a modern sharp lens where the diameter of the widest part of the lens (usually the shutter) is 60mm or less. I believe all Copal 0's are wider than than 60mm. Coverage requirments is only 6x6, any suggetions? New digital lenses? Thank you.

[skygzr]

Bill -

 

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Here's an option - the "lower" component from a Mamiya TLR lens. I

don't have one in front of me, but I think the filter diameter is

46mm, and the shutter isn't much bigger. There's a retaining nut on

the back of the "lens board", just like you'd expect. Remove it, and

the flash sync wire, and you're good to go.

 

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I don't know if you could expect to put Humpty Dumpty back together

again, so you'd be ruining the lens for future use on a TLR.

 

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The shutters don't have cable release sockets, just trip levers, so

you'll have to invent some mechanical linkage to trip the shutters.

 

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I know some of these details because I tore apart a damaged 80mm lens

some years ago (couldn't resist it). I might still have the lens and

shutter around somewhere.

 

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eBay has older used ones all the time. It might be a fairly

inexpensive option.

 

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Good luck!

[dave_willison]

Bill:

 

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Take a look at the following page. This particular hand-built camera

uses two 65mm Super Angulons, although they are not mounted on a LF

lenseboard and camera.

 

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http://www.ghouse.com/daniel/stereoscopy/equipment/index.html

 

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I believe that the older 65mm SA (often mounted in a syncho compur

shutter) is less than 60mm. In fact the widest part of these lenses is

the front element which measures about 55mm using the lenscap as a

guide. In addition, the rear relement is about 42mm and the retaining

ring is approximately 30mm.

 

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If my calculations are right, two of these lenses would require a

lensboard that is at least 4.25 inches wide. This is based on the

assumption that the lenses are mounted side-by-side and spaced 65mm

from center to center. I don't remember the exact requirements for

stereo, but this figure seems about right depending on the subject

distance. This also assumes a 1/4 inch margin around the lensboard

holes and adequate space for some clearance between the front

elements.

 

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It would be easier to mount these lenses on a 5x7, but your 4x5 may

work if the camera has a large lensboard. The other problem to keep in

mind is whether your camera belows is compact enough to focus a 65mm

lense at infinity.

 

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I hope this helps and let me know if you need more exact dimensions on

the older SA.

 

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................................

[jim_galli4]

OK, this is a little far fetched but I'm just going to throw an idea

out there that might be buildable. What about those Polaroid ID

camera things with the twin 75mm lenses with adjustable apertures, and

the shutter is just 2 round holes that rotate on a common axle to line

up with the lenses and then close again? They're nearly worthless on

Ebay because digital does the job they were originally designed to do

much better now. You could always put better glass in front of the

rotating shutter, although some of the Polaroid glass wasn't too bad.

[doug_paramore]

Bill: I have a match to Kevin's Mamiya TLR lens you can have if you

want to go that route. I have no need for it.

 

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Regards,

[bill_glickman]

The Mamiya TLR lenses were popular for this application for years,

and still is due to their small size. I was hoping to find some

modern optics that would produce sharper chromes for this

application, but I guess I can not rule out the mamiya TLR lenses.

The Super Angulons used on the stereo camera which you provided the

link have copal 0 shutters I beleive...for his camera it is

acceptable since he shoots two 6x9 frames, while I am trying to

shoot two 6x6 frames on 4x5 film, so therefore the maximun diameter

of the lenses would need to be 59.5mm, otherwise, I can not center

the images over the tight fit for two 6x6's. I plan to use a very

thin septum between the lenses. Thanks for all the input.

 

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Does anyone know if the Rodenstock or Schneider digital lenses

can be fitted with smaller shutters, i.e. not Copals?

[bob_salomon]

No they can't.

 

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They have either 0 or 1 size threads.

 

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"Does anyone know if the Rodenstock or Schneider digital

lenses can be fitted with smaller shutters, i.e. not Copals? "

 

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want a brochure?

[bill_glickman]

Bob, yes, I will take the brochure if you feel these lenses will

accomplish my task. But from what you wrote above, it seems they

would be too wide, right? I have no way to check the dimensions on

the web for the Rodenstock digitals. Can you advise?

[bob_salomon]

There is no way to screw them into a shutter smaller then a 0.

 

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For a brochure we need a mailing address.

[struan_gray]

You might just be able to squeak two Mamiya 6 or 7 rangefinder

lenses in there (58 mm filters), but you'll have to control the

shutter yourself. Otherwise the only thing small enough is going

to be the lens off a MF folder, with the expensive Plaubel Makina

lenses amongst the most modern.

 

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Can you use a focal plane shutter? That would at least give you

the chance to use something like an enlarging lens or - a

compromise - a normal lens from a focal-plane 645 SLR like the

Pentaxes and Mamiyas. Alternately, it would let you get the cells

from a small view-camera lens re-mounted into a barrel.

[adam_friedberg]

the makina lenses - at least with the shutter - are very large.