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PhilRich · 08-21-2015, 09:03 PM

My Z has developed a problem. The aperture will randomly change after taking a picture. For example, when shooting in manual, if the aperture was set to 11, it might randomly shift to f10 or f13 without my making a change for the next shot. It has been doing this for the last few outings.

Is this a known problem with the Z? I really hate the idea of sending it in for repair for a problem like this, especially since I bought it in Canada and not the US.

Phil

Adam · 08-21-2015, 09:57 PM

If you have instant review on, the e-dials still affect the shutter speed and aperture. Is that throwing you off perhaps?

PhilRich · 08-21-2015, 10:16 PM

Thanks for the reply. I will check my settings to see if that is the problem.

Racerdew · 08-21-2015, 10:28 PM

Adam's the man!

transam879 · 08-22-2015, 02:40 AM

Originally posted by Adam

If you have instant review on, the e-dials still affect the shutter speed and aperture. Is that throwing you off perhaps?

I experience this problem when I try to zoom in to the instant review pic before it is displayed where you can zoom in, usually after a series of shots. Instead of zooming in (with the dial) it changes the aperture 1/3 stop instead.

**Ed Hurst** · 08-22-2015, 05:11 AM

The explanation given above is probably it, but just one silly thing to exclude - you don't have the camera set to auto bracket do you?

PhilRich · 08-22-2015, 09:33 AM

No, I don't have it set to auto bracket. I do use the 2 sec delay when on tripod. In general I don't purposely use the multitude of settings available in the camera and have a lot to learn about them, just shoot in manual.

Later when I have a chance I'll experiment with settings.

PhilRich · 08-22-2015, 06:23 PM

I've not been able to figure what was going on. Today first off the problem was there. The battery was low and after changing the battery the aperture shifts have not been reoccurring.

From the responses from the forum I conclude that this is not a common problem.

Royce Howland · 08-23-2015, 08:16 AM

Also make sure you're running the latest firmware. A number of goofy glitches in the Z have been fixed over the months.

luchoh · 05-21-2018, 10:51 AM

@PhilRich - did you figure this out? My 645z developed the same issue.

08-21-2015, 09:03 PM	#1
PhilRich Senior Member Join Date: Apr 2015 Location: Western Washington Posts: 204	645Z Aperture Problem My Z has developed a problem. The aperture will randomly change after taking a picture. For example, when shooting in manual, if the aperture was set to 11, it might randomly shift to f10 or f13 without my making a change for the next shot. It has been doing this for the last few outings. Is this a known problem with the Z? I really hate the idea of sending it in for repair for a problem like this, especially since I bought it in Canada and not the US. Phil

08-21-2015, 09:57 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	If you have instant review on, the e-dials still affect the shutter speed and aperture. Is that throwing you off perhaps? Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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08-21-2015, 10:16 PM	#3
PhilRich Senior Member Join Date: Apr 2015 Location: Western Washington Posts: 204 Original Poster	Thanks for the reply. I will check my settings to see if that is the problem.

08-21-2015, 10:28 PM	#4
Racerdew Senior Member Join Date: Apr 2011 Location: Thousand Oaks, CA Photos: Gallery \| Albums Posts: 285	Adam's the man!

08-22-2015, 02:40 AM	#5
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651	Originally posted by Adam If you have instant review on, the e-dials still affect the shutter speed and aperture. Is that throwing you off perhaps? I experience this problem when I try to zoom in to the instant review pic before it is displayed where you can zoom in, usually after a series of shots. Instead of zooming in (with the dial) it changes the aperture 1/3 stop instead.

08-22-2015, 05:11 AM	#6
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,657	The explanation given above is probably it, but just one silly thing to exclude - you don't have the camera set to auto bracket do you?

08-22-2015, 09:33 AM	#7
PhilRich Senior Member Join Date: Apr 2015 Location: Western Washington Posts: 204 Original Poster	No, I don't have it set to auto bracket. I do use the 2 sec delay when on tripod. In general I don't purposely use the multitude of settings available in the camera and have a lot to learn about them, just shoot in manual. Later when I have a chance I'll experiment with settings.

08-22-2015, 06:23 PM	#8
PhilRich Senior Member Join Date: Apr 2015 Location: Western Washington Posts: 204 Original Poster	I've not been able to figure what was going on. Today first off the problem was there. The battery was low and after changing the battery the aperture shifts have not been reoccurring. From the responses from the forum I conclude that this is not a common problem.

08-23-2015, 08:16 AM	#9
Royce Howland Senior Member Join Date: Nov 2010 Location: Calgary, Alberta Posts: 275	Also make sure you're running the latest firmware. A number of goofy glitches in the Z have been fixed over the months.

05-21-2018, 10:51 AM	#10
luchoh New Member Join Date: Dec 2015 Posts: 3	@PhilRich - did you figure this out? My 645z developed the same issue.

645Z Aperture Problem

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