Aperture chatter

**richard0170** · 05-06-2023, 03:05 AM

My recently acquired F 50mm f1.7 behaves oddly on my KP. Whenever the camera is turned on or woken up with the lens attached the aperture "chatters" for a moment before behaving normally like any other AF screw drive lens. It does not behave like this on my K3 or K1 ii, having impeccable manners on those cameras. Has anyone else experienced something similar, know what causes the problem and know of any potential cure?

**JensE** · 05-06-2023, 04:30 AM

Originally posted by richard0170

My recently acquired F 50mm f1.7 behaves oddly on my KP. Whenever the camera is turned on or woken up with the lens attached the aperture "chatters" for a moment before behaving normally like any other AF screw drive lens. It does not behave like this on my K3 or K1 ii, having impeccable manners on those cameras. Has anyone else experienced something similar, know what causes the problem and know of any potential cure?

Same on my KP with several lenses (e.g. yesterday with the HD-DFA 100mm AW macro), but only in live view. It also happens on my K-1, I think, but not as often or intense. So far, I have not noticed any problems.

**UncleVanya** · 05-06-2023, 05:48 AM

I think I’ve seen this in live view with at least one lens on my KP.

**mikesbike** · 05-06-2023, 02:12 PM

(a sexist joke) Maybe it is the female coupling?

que es tu · 05-06-2023, 03:04 PM

My SMC DA 21mm Ltd does this quite annoyingly on my KP!

My HD DA 55-300 f4-5.8 used to do it too, but has stopped! Weird, huh? I have tried cleaning the contacts on the 21mm, and making sure it is seated on the camera properly, and I've tried fresh batteries, but nothing works. Sometimes the 21mm doesn't do it for a while, then it starts again! It doesn't seem to hurt anything, and it quickly stops, so I guess I should just ignore it, which I do!

que es tu · 05-06-2023, 03:05 PM

Originally posted by mikesbike

(a sexist joke) Maybe it is the female coupling?

Bow-chicka wow wow!

05-06-2023, 03:05 AM	#1
richard0170 Site Supporter Join Date: Feb 2017 Photos: Gallery \| Albums Posts: 2,032	Aperture chatter My recently acquired F 50mm f1.7 behaves oddly on my KP. Whenever the camera is turned on or woken up with the lens attached the aperture "chatters" for a moment before behaving normally like any other AF screw drive lens. It does not behave like this on my K3 or K1 ii, having impeccable manners on those cameras. Has anyone else experienced something similar, know what causes the problem and know of any potential cure?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Auto Aperture FAQ - changing aperture using lenses without aperture ring	angerdan	Film SLRs and Compact Film Cameras	11	03-11-2022 02:03 PM
Aperture block on K50...Finding legacy lenses with aperture rings give new life!	PBRD	Pentax SLR Lens Discussion	49	12-19-2021 03:45 AM
Lens w/o aperture ring + adaptor to M4/3 : effect of adjusting aperture on adaptor?	timo	Pentax SLR Lens Discussion	5	08-18-2021 04:03 PM
Aperture control problems with variable aperture lenses (with aperture rings)	gtxSeries	Troubleshooting and Beginner Help	3	09-13-2017 01:11 PM
Idle chatter	fractal	Monthly Photo Contests	0	01-06-2010 12:19 AM

05-06-2023, 04:30 AM	#2
JensE Site Supporter Join Date: Dec 2015 Location: Leipzig Photos: Gallery \| Albums Posts: 1,969	Originally posted by richard0170 My recently acquired F 50mm f1.7 behaves oddly on my KP. Whenever the camera is turned on or woken up with the lens attached the aperture "chatters" for a moment before behaving normally like any other AF screw drive lens. It does not behave like this on my K3 or K1 ii, having impeccable manners on those cameras. Has anyone else experienced something similar, know what causes the problem and know of any potential cure? Same on my KP with several lenses (e.g. yesterday with the HD-DFA 100mm AW macro), but only in live view. It also happens on my K-1, I think, but not as often or intense. So far, I have not noticed any problems.

05-06-2023, 05:48 AM	#3
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,404	I think I’ve seen this in live view with at least one lens on my KP.

05-06-2023, 02:12 PM	#4
mikesbike Site Supporter Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,549	(a sexist joke) Maybe it is the female coupling?

05-06-2023, 03:04 PM	#5
que es tu Pentaxian Join Date: Feb 2020 Location: Smoky Mountains, NC Photos: Gallery \| Albums Posts: 1,602	My SMC DA 21mm Ltd does this quite annoyingly on my KP! My HD DA 55-300 f4-5.8 used to do it too, but has stopped! Weird, huh? I have tried cleaning the contacts on the 21mm, and making sure it is seated on the camera properly, and I've tried fresh batteries, but nothing works. Sometimes the 21mm doesn't do it for a while, then it starts again! It doesn't seem to hurt anything, and it quickly stops, so I guess I should just ignore it, which I do!

05-06-2023, 03:05 PM	#6
que es tu Pentaxian Join Date: Feb 2020 Location: Smoky Mountains, NC Photos: Gallery \| Albums Posts: 1,602	Originally posted by mikesbike (a sexist joke) Maybe it is the female coupling? Bow-chicka wow wow!