Pentax KS2 aperture ring problem

Ahsaaan · 09-28-2019, 12:18 AM

Dear all, i am new to this forum and to photography the problem is from last week i cant change aperture from aperture ring in pentax ks2. Lense remains wide open even if i stop down can anybody help me out? Thanks in Advance.

---------- Post added 09-28-19 at 12:21 AM ----------

Mostly i use manual lenses, in start i was able to change their aperture but now they remain wide open even if i stop down.

---------- Post added 09-28-19 at 12:22 AM ----------

Mostly i use manual lenses, in start i was able to change their aperture but now they remain wide open even if i stop down.

Adam · 09-28-2019, 12:39 AM - **1 Like**

Make sure you're in M mode when using the aperture ring. Also, if the lens isn't manual, it's best to leave the aperture ring set to A.

Ahsaaan · 09-28-2019, 12:47 AM

Originally posted by Adam

Make sure you're in M mode when using the aperture ring. Also, if the lens isn't manual, it's best to leave the aperture ring set to A.

My lense is Manual smc M 1.7 the problem is i cant change aperture mechanically when attached to camera something inside is keeping it wide open whereas when ever i detach lense and change aperture of lense from ring it changes.

slartibartfast01 · 09-28-2019, 01:20 AM

Originally posted by Ahsaaan

My lense is Manual smc M 1.7 the problem is i cant change aperture mechanically when attached to camera something inside is keeping it wide open whereas when ever i detach lense and change aperture of lense from ring it changes.

There is a menu setting to allow aperture ring use but I assume you have already set that.

RKKS08 · 09-28-2019, 03:21 AM - **1 Like**

You know the lens will only close the aperture during green button metering and while the exposure is taken?
All the rest of the time the aperture stays fully open (as long as the lens is fixed on the body).
Detached from the camera, the aperture will follow the ring setting.

This behaviour is different from that of M42 lenses.
Sorry if you already know all this.

**pschlute** · 09-28-2019, 03:57 AM

Originally posted by Adam

Make sure you're in M mode when using the aperture ring

Adam is correct. The camera must be in Manual mode

Kozlok · 09-28-2019, 05:15 AM

You may want to review the instructions again. Also pasting this here for anyone else who has the same issues.

How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc) - PentaxForums.com

**stevebrot** · 09-28-2019, 09:08 AM

Originally posted by Ahsaaan

My lense is Manual smc M 1.7 the problem is i cant change aperture mechanically when attached to camera something inside is keeping it wide open whereas when ever i detach lense and change aperture of lense from ring it changes.

Welcome to the Pentax Forums!

That is how lenses with auto aperture actuation work.* Most (almost all) K-mount lens when used on a K-mount camera only stop down for the exposure, depth of field preview, or for stop-down metering. When using the aperture ring to control the iris, this is only allowed in M or B modes on your camera with metering limited to M mode with set ISO. One must also enable aperture ring in the menu settings. Basic instructions are on p115 of the user guide. All other modes operate as Av mode with the lens staying wide open, even during exposure.

Steve

* Since the early-to-mid 1960s, the vast majority of SLR lenses (all makes) work this way with very few having fully manual aperture.

Last edited by stevebrot; 09-28-2019 at 10:59 AM.

09-28-2019, 12:18 AM	#1
Ahsaaan New Member Join Date: Sep 2019 Posts: 2	Pentax KS2 aperture ring problem Dear all, i am new to this forum and to photography the problem is from last week i cant change aperture from aperture ring in pentax ks2. Lense remains wide open even if i stop down can anybody help me out? Thanks in Advance. ---------- Post added 09-28-19 at 12:21 AM ---------- Mostly i use manual lenses, in start i was able to change their aperture but now they remain wide open even if i stop down. ---------- Post added 09-28-19 at 12:22 AM ---------- Mostly i use manual lenses, in start i was able to change their aperture but now they remain wide open even if i stop down.

09-28-2019, 12:39 AM - 1 Like	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 49,170	Make sure you're in M mode when using the aperture ring. Also, if the lens isn't manual, it's best to leave the aperture ring set to A. 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, 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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09-28-2019, 12:47 AM	#3
Ahsaaan New Member Join Date: Sep 2019 Posts: 2 Original Poster	Originally posted by Adam Make sure you're in M mode when using the aperture ring. Also, if the lens isn't manual, it's best to leave the aperture ring set to A. My lense is Manual smc M 1.7 the problem is i cant change aperture mechanically when attached to camera something inside is keeping it wide open whereas when ever i detach lense and change aperture of lense from ring it changes.

09-28-2019, 01:20 AM	#4
slartibartfast01 Pentaxian Join Date: May 2015 Photos: Gallery Posts: 345	Originally posted by Ahsaaan My lense is Manual smc M 1.7 the problem is i cant change aperture mechanically when attached to camera something inside is keeping it wide open whereas when ever i detach lense and change aperture of lense from ring it changes. There is a menu setting to allow aperture ring use but I assume you have already set that.

09-28-2019, 03:21 AM - 1 Like	#5
RKKS08 Pentaxian Join Date: Mar 2010 Location: Frankfurt am Main Posts: 1,229	You know the lens will only close the aperture during green button metering and while the exposure is taken? All the rest of the time the aperture stays fully open (as long as the lens is fixed on the body). Detached from the camera, the aperture will follow the ring setting. This behaviour is different from that of M42 lenses. Sorry if you already know all this.

09-28-2019, 03:57 AM	#6
pschlute Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 3,770	Originally posted by Adam Make sure you're in M mode when using the aperture ring Adam is correct. The camera must be in Manual mode

09-28-2019, 05:15 AM	#7
Kozlok Pentaxian Join Date: Jun 2012 Location: Albuquerque Photos: Gallery Posts: 2,841	You may want to review the instructions again. Also pasting this here for anyone else who has the same issues. How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc) - PentaxForums.com

09-28-2019, 09:08 AM	#8
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 34,735	Originally posted by Ahsaaan My lense is Manual smc M 1.7 the problem is i cant change aperture mechanically when attached to camera something inside is keeping it wide open whereas when ever i detach lense and change aperture of lense from ring it changes. Welcome to the Pentax Forums! That is how lenses with auto aperture actuation work.* Most (almost all) K-mount lens when used on a K-mount camera only stop down for the exposure, depth of field preview, or for stop-down metering. When using the aperture ring to control the iris, this is only allowed in M or B modes on your camera with metering limited to M mode with set ISO. One must also enable aperture ring in the menu settings. Basic instructions are on p115 of the user guide. All other modes operate as Av mode with the lens staying wide open, even during exposure. Steve * Since the early-to-mid 1960s, the vast majority of SLR lenses (all makes) work this way with very few having fully manual aperture. Last edited by stevebrot; 09-28-2019 at 10:59 AM.

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