Pentax 67 pressure plate..

chris77 · Mar 11, 2021

Hello Pentax 67 users.
I have bought a Pentax 67 and found that the edges of my negatives are somewhat soft. I mean the borders.
I have checked this with film that I sacrificed and shutter open in bulb. It seems the pressure plate does not press the film completely against the frame. I mean not perfectly.
So I tried switching the pressure plate to 220 (using 120 film) and voilà, more pressure, I can easily advance the film though (feels the same).
Is there a potential problem using it with 120 film, setting the plate to 220?
Any opinions would be welcome.
Cheers

halfaman · Mar 11, 2021

chris77 said:
Is there a potential problem using it with 120 film, setting the plate to 220?

Not in your case, but this should not happen in a healthy Pentax 67. I can hardly advance film in my Pentax 67II if I use the plate in 220 position with 120 film.

chris77 · Mar 11, 2021

halfaman said:
Not in your case, but this should not happen in a healthy Pentax 67. I can hardly advance film in my Pentax 67II if I use the plate in 220 position with 120 film.

Hmm. Thanks. The body is hardly used. It's the 67 with late serial number.
I don't really understand it neither but I guess I will shoot a roll on tripod to see if it does affect sharpness at all..

Grim Tuesday · Mar 11, 2021

It is not likely to affect sharpness, especially if you find your plate set at 220 is pushing harder than 120. But I don't really understand how this can be the case with the way the P67 plate works. Could something have gotten under it and you dislodged it when switching from 120 to 220?

chris77 · Mar 12, 2021

Hello .
Thanks for your reply. No, the plate is and was working correctly.
Just as the borders between the exposed Neg and the clear film seemed somewhat blurry, compared to the negatives I got with the rz67 (razorsharp distinct borders) I started wondering..
And by inspection of the pentax67 I have to say that the film is more tightly pressed against the frame in the 220 position, for a fact.
So, I guess I will just try it out.
Could it be that backing paper and/or film base is thinner today than in the beginning ofthe 80s?

chris77 · Mar 13, 2021

Hello againjust some follow up.
The borders of exposed negs are ever so slightly sharper, very little difference.
I honestly think that the sharpness is slightly improved, but I may be wrong as I didn't set up a proper test shot, so it stays subjective.
Good day

Pentax 67 pressure plate..

chris77

halfaman

chris77

Grim Tuesday

chris77

chris77

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