aperture problem with 50 1.7

kent · 11-01-2009, 03:53 AM

Hi,
I've just received old pentax 50mm 1.7 lens. It's tiny , it's great, it's not automatic.
However I have two problems with it:
1. k200d won't read aperture value (shows F---)
2.Even though aperture closes when i push shutter button there is no difference between f1.7 anf f22. I mean, shutter speed is always the same. I saw that aperture really closes when I push shutter button, but still it seems that all the time I am taking pictures at 1.7. DOF remains the same at 1.7 or at 8 or at 22.
Idea?

xjjohnno · 11-01-2009, 04:02 AM

Try setting to M mode. The F stop won't show, that happens with A and later lenses.

kent · 11-01-2009, 04:09 AM

Originally posted by xjjohnno

Try setting to M mode. The F stop won't show, that happens with A and later lenses.

I've tried,only exposition changes. I guess aperture is closed just too late, because on the same shutter speed there is no exposition changes between 1.7 and 22.

RawheaD · 11-01-2009, 04:12 AM

Originally posted by kent

I've tried,only exposition changes. I guess aperture is closed just too late, because on the same shutter speed there is no exposition changes between 1.7 and 22.

Set eposure with the green button.

**Ash** · 11-01-2009, 04:16 AM

Kent, not sure if you know this already, but make sure the menu setting for permitting non-A apertures on your lens is set to allow non-A settings.

Then see here:
https://www.pentaxforums.com/forums/pentax-dslr-articles/32-can-i-use-k-m-len...ist-ds-dl.html

Basically, set the aperture on the lens, go to M mode on the camera, focus, stop-down meter using the green button (which automatically meters the scene for the aperture chosen and sets a shutter speed) then take the shot.

patriotap · 11-01-2009, 04:28 AM

not sure if its different, but i have the same lens but on a k20d, i set the aperture ring to lock on A, then i can change f stop and shutter speed on the camera, the F-- goes away after that ring lock.

kent · 11-01-2009, 04:38 AM

Originally posted by Ash

Kent, not sure if you know this already, but make sure the menu setting for permitting non-A apertures on your lens is set to allow non-A settings.

Then see here:
https://www.pentaxforums.com/forums/pentax-dslr-articles/32-can-i-use-k-m-len...ist-ds-dl.html

Basically, set the aperture on the lens, go to M mode on the camera, focus, stop-down meter using the green button (which automatically meters the scene for the aperture chosen and sets a shutter speed) then take the shot.

Thank you very much, I forgot about green button. Now everything works.

**Ash** · 11-01-2009, 04:39 AM

That's for an A lens, Brian. No indication from Kent yet that he has an A, F or an M lens. For all A, F and FA lenses (and their non-OEM equivalents), the aperture ring should be set at A, and aperture controlled on the camera. But for M lenses, the above guidelines need to be following for the lens to work well.

kent · 11-01-2009, 04:40 AM

Originally posted by patriotap

not sure if its different, but i have the same lens but on a k20d, i set the aperture ring to lock on A, then i can change f stop and shutter speed on the camera, the F-- goes away after that ring lock.

There is no A position indicated. It is written on lens SMC Pentax-M . So all aperture values I have to set by myself

patriotap · 11-01-2009, 05:11 AM

gothca, yes mine is the A version

11-01-2009, 03:53 AM	#1
kent Veteran Member Join Date: May 2009 Location: Lithuania Photos: Gallery Posts: 344	aperture problem with 50 1.7 Hi, I've just received old pentax 50mm 1.7 lens. It's tiny , it's great, it's not automatic. However I have two problems with it: 1. k200d won't read aperture value (shows F---) 2.Even though aperture closes when i push shutter button there is no difference between f1.7 anf f22. I mean, shutter speed is always the same. I saw that aperture really closes when I push shutter button, but still it seems that all the time I am taking pictures at 1.7. DOF remains the same at 1.7 or at 8 or at 22. Idea?

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11-01-2009, 04:02 AM	#2
xjjohnno Veteran Member Join Date: Jan 2009 Location: Melbourne Australia Photos: Gallery Posts: 2,115	Try setting to M mode. The F stop won't show, that happens with A and later lenses.

11-01-2009, 04:09 AM	#3
kent Veteran Member Join Date: May 2009 Location: Lithuania Photos: Gallery Posts: 344 Original Poster	Originally posted by xjjohnno Try setting to M mode. The F stop won't show, that happens with A and later lenses. I've tried,only exposition changes. I guess aperture is closed just too late, because on the same shutter speed there is no exposition changes between 1.7 and 22.

11-01-2009, 04:12 AM	#4
RawheaD Veteran Member Join Date: Dec 2008 Location: MA, USA Photos: Gallery Posts: 831	Originally posted by kent I've tried,only exposition changes. I guess aperture is closed just too late, because on the same shutter speed there is no exposition changes between 1.7 and 22. Set eposure with the green button.

11-01-2009, 04:16 AM	#5
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Kent, not sure if you know this already, but make sure the menu setting for permitting non-A apertures on your lens is set to allow non-A settings. Then see here: https://www.pentaxforums.com/forums/pentax-dslr-articles/32-can-i-use-k-m-len...ist-ds-dl.html Basically, set the aperture on the lens, go to M mode on the camera, focus, stop-down meter using the green button (which automatically meters the scene for the aperture chosen and sets a shutter speed) then take the shot.

11-01-2009, 04:28 AM	#6
patriotap Senior Member Join Date: Oct 2009 Location: South Jersey Photos: Albums Posts: 159	not sure if its different, but i have the same lens but on a k20d, i set the aperture ring to lock on A, then i can change f stop and shutter speed on the camera, the F-- goes away after that ring lock.

11-01-2009, 04:38 AM	#7
kent Veteran Member Join Date: May 2009 Location: Lithuania Photos: Gallery Posts: 344 Original Poster	Originally posted by Ash Kent, not sure if you know this already, but make sure the menu setting for permitting non-A apertures on your lens is set to allow non-A settings. Then see here: https://www.pentaxforums.com/forums/pentax-dslr-articles/32-can-i-use-k-m-len...ist-ds-dl.html Basically, set the aperture on the lens, go to M mode on the camera, focus, stop-down meter using the green button (which automatically meters the scene for the aperture chosen and sets a shutter speed) then take the shot. Thank you very much, I forgot about green button. Now everything works.

11-01-2009, 04:39 AM	#8
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	That's for an A lens, Brian. No indication from Kent yet that he has an A, F or an M lens. For all A, F and FA lenses (and their non-OEM equivalents), the aperture ring should be set at A, and aperture controlled on the camera. But for M lenses, the above guidelines need to be following for the lens to work well.

11-01-2009, 04:40 AM	#9
kent Veteran Member Join Date: May 2009 Location: Lithuania Photos: Gallery Posts: 344 Original Poster	Originally posted by patriotap not sure if its different, but i have the same lens but on a k20d, i set the aperture ring to lock on A, then i can change f stop and shutter speed on the camera, the F-- goes away after that ring lock. There is no A position indicated. It is written on lens SMC Pentax-M . So all aperture values I have to set by myself

11-01-2009, 05:11 AM	#10
patriotap Senior Member Join Date: Oct 2009 Location: South Jersey Photos: Albums Posts: 159	gothca, yes mine is the A version