Conversion of Hartblei T/S lens to pentax 67

[herb]

I am quite fond of my t/s lens that fits a 6x6 Ukranian camera (hartblei), and it seems reasonable it could be adapted to fit a Pentax 67. Anybody ever heard of that?

 

[paul ewins]

I've never heard of an adapter to mount P6 lenses on a Pentax 67. That's probably because until recently most 67s were sold to professionals that would just buy the 67 lenses. The other thing is of course that you run the risk of running out of image circle when mounting a lens designed for a smaller system to a larger one. That shouldn't apply to your Hartblei lens as it will need a bigger image circle anyway for the tilts and shifts. There is a good chance that the telephoto lenses would cover the 67 image circle too. Anyway the register distance for the P6 is 74.1mm and for the P67 it is 84.95mm so what you need is effectively a 10.85mm extension tube with a 67 bayonet and P6 breech. The shortest 67 tube is 15mm long so you can't just modify that one but maybe there is a 10mm P6 extension tube. In any case it should be a very simple job to manufacture what you want.

 

[Rudeofus]

Paul, I think you got the thing with the registration distance mixed up. The Pentax 67 has the longer registration distance, which places the lens too far from the film plane, which means that for infinity focus capability the lens would require a minus 11mm extension tube which obviously doesn't exist. If herb somehow managed to attach his hartblei lens to his Pentax 67, he could only use it for close up and macro shots.

 

[paul ewins]

Oops, you're absolutely right of course. I guess T/S could be useful for macro shots, but probably not what herb had in mind.

 

[borisdeswan]

A few months ago a reputable dealer on the auction site was offering a 120 mm mc f 2.8 Biometar lens in pentax 6x7 mount. I,m not sure if the image circle of said lens can cover 6x7 without vignetting, but another example being sold, still is a mamiya 50mm shift mounted on a Hasselblad mount. (Ofcourse a shift lens has got to produce a larger image circle.) However nowadays adapters abound that can make use of lenses on different cameras that was unheard of in the past. Perhaps the modified lens was intended only for portraits...

 

[surfotog]

Herb,
At one point Hartblei made a very few copies of the 55/4.5 super-rotator in Pentax 67 mount. No longer. Nor will they make a custom T/S in P67 mount, I asked. Your current lens could probably be mounted on a P67 w/ an adapter, but as stated earlier, you won't have infinity focus. To get that, the lens would have to be disassembled and remanufactured, to get the proper registry distance. This is what Hartblei must have done with the 55/4.5, as it was originally intended for a smaller format.