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03-02-2013, 07:59 AM   #1
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Hello everyone! Hope you might be able to help with a Pentax 645 FA 75mm lens problem

Pentax 645 FA 75mm lens aperture problem.

Hi Folks!

Think I might have been bitten for taking a gamble on a Japanese Ebay spur-of-the-moment purchase but - I have a very clean condition Pentax 645 FA 75mm F2.8 but the aperture doesn't work. The aperture ring feels 'nasty' but it is free-moving, just very 'clicky' not like my other lenses which are very smooth. Auto focus works fine though and looking inside the lens I can't see anything that might be causing the blades to jam. Does anyone have any idea if this is a relatively easy fix? Part of me wonders if the aperture ring is not actually engaging with the blades and maybe just skimming over the top - hence the 'clickyness?' Don't know - I have minimal expertise (okay, none) and to be honest I'd have though it would be far stiffer if it was out of position.

I would be concerned at returning this from the UK to the Japanese Ebay seller since it's taken a month already just to receive it and am not sure how likely it would be I'd get a refund without major hassle. So I might just have to keep it and if it is a major repair problem might well have to resign myself to just shooting wide-open with that lens. It would be a shame though because I'd be missing the best of it.

Has anyone else had a similar experience with a lens? I would appreciate any guidance.

Thanks for your time.


03-02-2013, 12:17 PM   #2
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Is the aperture (when set to A or 22) moving when You push the lever?
Is the "A" -setting recognized by the camera?

-Linus-
03-02-2013, 01:16 PM   #3
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Original Poster
QuoteOriginally posted by -Linus- Quote
Is the aperture (when set to A or 22) moving when You push the lever?
Is the "A" -setting recognized by the camera?

-Linus-
Linus, thanks for posting.

Yes the aperture does close down when I push the lever. And the "A" setting is recognised by the camera (I get a reading from the exposure meter.) Is this where I discover I've been really dumb and the aperture isn't supposed to shut down manually on this FA lens?

Thanks for answering so quickly.

Stella
03-03-2013, 04:20 AM   #4
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The aperture will shut down when you press the DOV-Preview lever. If the lens is manually set to 22 (the maximum) Your viewfinder should get really dark.
If not... there really might be something wrong.

-Linus-

03-03-2013, 05:53 AM   #5
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Linus, thanks a lot. No, it's just me being stupid. The lens is fine. I've just gone from a prolonged spell of using the K5 with some manual A lenses and forgotten to engage brain when switching to the 645N. Thanks for the clarity. You've been a massive help.

Stella
03-04-2013, 05:47 PM   #6
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QuoteOriginally posted by Stellaaaah Quote
Linus, thanks a lot. No, it's just me being stupid. The lens is fine. I've just gone from a prolonged spell of using the K5 with some manual A lenses and forgotten to engage brain when switching to the 645N. Thanks for the clarity. You've been a massive help.

Stella
That will teach you to mess around with digital You have a great camera and lens there. Everything works intuitively on the P645N as things did in the pre-digital era

asahijock
03-04-2013, 10:06 PM   #7
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QuoteOriginally posted by asahijock Quote
That will teach you to mess around with digital You have a great camera and lens there. Everything works intuitively on the P645N as things did in the pre-digital era

asahijock
Ha, ha - quite right Asahijock. I wanted a 645N forever but the price put them way out of my affordability. Thanks to digital, though - I now have one. And I have to say that it feels like the most perfect camera ever designed (as much as I'd know anything about that ;-) It's the right size, the right weight, all the controls are fantastically positioned and simple - and all with that big fat shutter sound to put a grin on your face! It's still new to me but I do adore it.

`Stella
03-10-2013, 08:03 AM   #8
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with the 75mm f 2.8 you can wheel the 645d around like a 35mm camera.

03-11-2013, 08:56 AM   #9
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Thanks Bull. Yes, it is beginning to take over. I'm about to start developing my own B&W film too, so I have a sneaky feeling it is going to be the one I have with me all the time, very shortly. And there's nothing like film to make you concentrate on the shot. Digital was making me lazy even though I was shooting all manually with some old film lenses on my K5. You have to work differently with the 645N.
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