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09-02-2010, 03:08 AM   #1
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Issues with K10D and aperture

I have a K10D where last year at version 1.3 I tweaked the AF in debug mode with the back focusing issues I was having with my DA* 50-135. Last month I updated the firmware to 1.31 and the DA* still works properly. Today, I bought a DA 40 and I cannot shoot anything above f/2.8, when I do, the shot is way over exposed and in the exif, it states the shot was taken at f/2.8 (although it was dialed to f/8). I then tried my 18-55 kit lens and I get the same issue.

So, my question is does this issue have anything to do with the debug mode setting and the upgrade to 1.31?

Cheers for any help.

**maybe wrong area...can this be moved please if it is.


Last edited by figmental1978; 09-02-2010 at 03:53 AM.
09-02-2010, 09:38 AM   #2
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Since this affects more than one lens, then it definitely seems like a camera problem, so I do think moving it makes sense - done!
09-02-2010, 10:29 AM   #3
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QuoteOriginally posted by figmental1978 Quote
I have a K10D where last year at version 1.3 I tweaked the AF in debug mode with the back focusing issues I was having with my DA* 50-135. Last month I updated the firmware to 1.31 and the DA* still works properly. Today, I bought a DA 40 and I cannot shoot anything above f/2.8, when I do, the shot is way over exposed and in the exif, it states the shot was taken at f/2.8 (although it was dialed to f/8). I then tried my 18-55 kit lens and I get the same issue.

So, my question is does this issue have anything to do with the debug mode setting and the upgrade to 1.31?

Cheers for any help.

**maybe wrong area...can this be moved please if it is.
Set your camera for optical preview (pg 169-170 in the manual). Put the camera into M mode. Dial an aperture higher than f2.8 (or whatever wide open is) such as f11 or so. When you activate the optical preview, you should see the lens stop down (and your viewfinder will get darker). This is also known as DOF preview as well. It it doesn't happen, then the camera is not allowing the lens to stop down and something is going on with the lever. You can verify this by removing the lens and see if the lever moves when you activate the preview.

Start there.


Last edited by JeffJS; 09-02-2010 at 02:48 PM.
09-02-2010, 12:58 PM   #4
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I had the same problem with my K10, some years ago. It was a defective lens control circuit board (or something like that) that was exchanged under warranty. It didn't affect the main board.
Cheers - Klaus (and good luck!)

09-02-2010, 02:05 PM   #5
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Thanks JeffJS, I'll test that when I get home from work. Lets hope it's not what Klaus described as my K10D's warranty is well expired.
09-02-2010, 03:08 PM   #6
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My checks are only going to tell you if the lens is stopping down or not. The Optical preview forces it to do so. If it is, I'm out of ideas. If not, it could be a mechanical problem in the camera or as Klaus says, electronic. You say your DA* lens(es) are working. Does that mean they are Focusing? or are you stating that They/It stops down when you take a photo?

09-03-2010, 05:53 AM   #7
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Ok, I have the cam on optical (DOF) preview as default anyway, I set the DA 40 to f/11 and press the shutter half way and the aperture reverts back to f/2.8.

The K10D and the DA* 50-135 play well together, just not the new DA 40 or the 18-55. Any ideas?
09-03-2010, 08:20 AM   #8
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QuoteOriginally posted by figmental1978 Quote
Ok, I have the cam on optical (DOF) preview as default anyway, I set the DA 40 to f/11 and press the shutter half way and the aperture reverts back to f/2.8.

The K10D and the DA* 50-135 play well together, just not the new DA 40 or the 18-55. Any ideas?
No, Not half press shutter, pull the preview all the way over to activate it. That's the power switch and if you are looking through the viewfinder, that would be to the right (to the left if looking at the front of the camera). Make sure you are in M mode when you do it otherwise, auto exposure takes over. All we're trying to discover here is if it's a camera or lens issue. The fact your DA* works (stops down as you'd expect, correct?), has me confused about this. Only the camera controls aperture and if it is doing so on the 50-135, I see no reason why it shouldn't on your new DA40. I would say clean the contacts on your camera but if the one lens is working properly I doubt that would change anything.



09-03-2010, 02:38 PM   #9
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QuoteOriginally posted by figmental1978 Quote
So, my question is does this issue have anything to do with the debug mode setting and the upgrade to 1.31?
I don't know what's wrong. But I guess it has nothing to do with 1.31 firmware and/or debug mode setting.

My K10D is exactly that (1.31 firmware and debug mode to correct severe back focus). It has no problem with any of my lenses (DA40 included).
09-03-2010, 04:19 PM   #10
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Ok, so I did the stop down test and it's stopping down correctly on the DA*50-135 but not on the DA40 or the 18-55. When I took the lens off and tried the preview, the lever seems to be moving correctly.
09-03-2010, 08:05 PM   #11
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QuoteOriginally posted by figmental1978 Quote
Ok, so I did the stop down test and it's stopping down correctly on the DA*50-135 but not on the DA40 or the 18-55. When I took the lens off and tried the preview, the lever seems to be moving correctly.
Well, Now, I'm Really confused... Are these the only 3 lenses you have? Is there a chance of trying another camera? Every type of lens I own (M, A, FA-Limited, DA, DA*), behaves correctly on my K10d. The only real difference is mine is at v1.10. I fail to see why the firmware would make any difference. Aside from turning on SDM in v1.30, I don't think and I've never seen reported, any lens specific changes in firmware updates.

I'm going to assume the apertures on the two DA lenses are actually working. That is, you can manually operate the levers on the back of the lenses and they both open and Snap back closed properly, Correct? The only other mechanical issue I can think of is dirty contacts on the lens mount. Though I still don't see what firmware would have affected about them, try cleaning them. Can't hurt.

I don't know if this will work over v1.31 but you can try backdating the firmware..

Vietzon.com Forums

Some info about it here..

Re: SDM bypass: Pentax SLR Talk Forum: Digital Photography Review

09-03-2010, 08:37 PM   #12
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I tried a few different M lenses and they stop down fine. I checked the two DA lenses and the aperture levers work fine. The only thing they have in common is that they're both DA but I doubt that would mean anything. I'll try and revert back to 1.3 or to a lower firmware.

Last edited by figmental1978; 09-03-2010 at 08:59 PM.
09-03-2010, 09:06 PM   #13
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I can't revert the firmware from 1.31 to anything less. I think there needs to be an update in the hack code to recognise 1.31, not sure though.

Anyway...any other ideas that doesn't require me buying a new cam or returning my DA40?
09-03-2010, 11:12 PM   #14
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I took a shot but I'm still perplexed by this. When you have the DA lens mounted, and you do the preview, can you Hear the aperture arm moving inside the camera? I've never checked (and have no reason to think they'd be different, are the levers on the rear of the lenses the same length (DA compared to M or DA*)? That's a REAL long shot that they'd be different enough to make a difference on the camera. If this were JUST the kit lens, I'd say who cares but you shouldn't be having problems with a NEW DA Limited lens.

At this point, I'm kind of out of ideas. Perhaps you can try just reloading 1.31? Otherwise, Short of trying another DA lens in a shop or taking the camera/lens (kit lens) to a service center, I'm going to have to let someone else jump in.

09-03-2010, 11:37 PM   #15
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Yeah, even though the DA lenses don't stop down, the aperture arm still moves. What I'll do is go back to the shop and tell them what's going on. I'll have to take my whole kit and demo what's going on so they can't blame it solely on the camera. Thanks so much Jeff for helping me out, I really appreciate your time.
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