Pentax 67ii front focus - easy to fix?

[pkr1979]

Hi all,

I've discovered while using a 130/2 projector lens that my Pentax 67II has a slight front focusing issue. How can I fix this? By adjusting the mirror?

Cheers
Peter

 

[OAPOli]

You would have to adjust the focus screen height to match the focal plane on film. To achieve the accuracy needed for a fast lens you would need an autocollimator. It's not too hard if you have the equipment.

 

[Eff64]

I hope you really like that lens-as in you never plan to use any others-because if you modify the body no other lens will work.

 

[pkr1979]

I assumed it was easier to discover it with that lens as the aperture is quite large, and that what causes the front focusing is a mirror + film plane issue - regardless of what lens you are using?

 

[grain elevator]

I assumed it was easier to discover it with that lens as the aperture is quite large, and that what causes the front focusing is a mirror + film plane issue - regardless of what lens you are using?

Yes, it's an slr. The focus on focusing screen and film must match, regardless of lens.

 

[pkr1979]

Thanks guys. Ill try to get this fixed while making sure it doesnt cause any issues with original lenses.

 

[rknewcomb]

Work the problem the other way...it is an SLR camera, so if the image from the 130/f2 lens when in focus on the ground glass screen does not come out focused on the film plain neither would an original Pentax lens. In other words, not a camera problem if the modern lenses work.
My $0.02 worth.

 

[pkr1979]

There is a chance, and probable, that Ive shot the original lenses wide open so rarely Ive never noticed.