pentax lens Myth

ljfitz · 12-29-2008, 05:47 AM

cannot get my original k mount lens to work with the k20 need help trying to use a 600mm f8 k type mount

wildlifephotog · 12-29-2008, 05:51 AM

You have to enable use of the aperture ring, and then shoot in manual mode.

JJJPhoto · 12-29-2008, 06:23 AM

Who manufactured the 600mm f8 lens in question?

Even if you set the camera menu to allow the use of manual lenses with aperture rings and use the camera in manual mode you may not get the best results.

I remember years ago buying a 500mm f8 mirror reflex lens and swearing that there was something wrong with my camera because whenever I used that lens I couldn't take an image that was correctly focused and the exposures weren't being consistently metered by the camera's in-body light meter.

It turned out it was just a REALLY bad lens.

Mike Cash · 12-29-2008, 06:28 AM

Is this "myth" something that can be dispelled by reading the manual?

newarts · 12-29-2008, 06:52 AM

Originally posted by ljfitz

cannot get my original k mount lens to work with the k20 need help trying to use a 600mm f8 k type mount

What's the problem? In what sense does it not function as you expect it should?

Blue · 12-29-2008, 07:09 AM

Originally posted by JJJPhoto

Who manufactured the 600mm f8 lens in question?

Even if you set the camera menu to allow the use of manual lenses with aperture rings and use the camera in manual mode you may not get the best results.

I remember years ago buying a 500mm f8 mirror reflex lens and swearing that there was something wrong with my camera because whenever I used that lens I couldn't take an image that was correctly focused and the exposures weren't being consistently metered by the camera's in-body light meter.

It turned out it was just a REALLY bad lens.

It is probably a Sigma lens since it is 600mm.

Isaac314 · 12-29-2008, 07:11 AM

Go into the custom menus and set enable aperture ring.

You can shoot on any of the auto modes as aperture priority, but the lens will stay at f/8. You can shoot in manual mode and use any aperture but the camera will not metre for you until you press the green button.

And next time search the forums...

Wheatfield · 12-29-2008, 07:25 AM

Originally posted by IsaacEastgate

Go into the custom menus and set enable aperture ring.

You can shoot on any of the auto modes as aperture priority, but the lens will stay at f/8. You can shoot in manual mode and use any aperture but the camera will not metre for you until you press the green button.

And next time search the forums...

And learn how to punctuate sentences.

Sean Nelson · 12-29-2008, 11:15 AM

Originally posted by ljfitz

cannot get my original k mount lens to work with the k20 need help trying to use a 600mm f8 k type mount

This link will help you. It's written for the K100 but operation on the K20 is almost identical:

K100D (Super) Pictorial guide to using manual lenses [imgs]

ljfitz · 12-29-2008, 02:35 PM

link to dp rreview proved the buisness

Miserere · 12-29-2008, 03:47 PM

If it's a mirror lens, shoot in Av.

12-29-2008, 05:47 AM	#1
ljfitz Inactive Account Join Date: Dec 2008 Location: ireland Posts: 3	pentax lens Myth cannot get my original k mount lens to work with the k20 need help trying to use a 600mm f8 k type mount

12-29-2008, 07:11 AM	#7
Isaac314 Veteran Member Join Date: Aug 2008 Location: London Photos: Gallery Posts: 417	pentax lens Retard Go into the custom menus and set enable aperture ring. You can shoot on any of the auto modes as aperture priority, but the lens will stay at f/8. You can shoot in manual mode and use any aperture but the camera will not metre for you until you press the green button. And next time search the forums...

12-29-2008, 02:35 PM	#10
ljfitz Inactive Account Join Date: Dec 2008 Location: ireland Posts: 3 Original Poster	problem solved thanks to all who replied link to dp rreview proved the buisness

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12-29-2008, 05:51 AM	#2
wildlifephotog Inactive Account Join Date: Nov 2008 Location: USA Posts: 924	You have to enable use of the aperture ring, and then shoot in manual mode.

12-29-2008, 06:23 AM	#3
JJJPhoto Veteran Member Join Date: Nov 2006 Location: Cincinnati, OH Posts: 419	Who manufactured the 600mm f8 lens in question? Even if you set the camera menu to allow the use of manual lenses with aperture rings and use the camera in manual mode you may not get the best results. I remember years ago buying a 500mm f8 mirror reflex lens and swearing that there was something wrong with my camera because whenever I used that lens I couldn't take an image that was correctly focused and the exposures weren't being consistently metered by the camera's in-body light meter. It turned out it was just a REALLY bad lens.

12-29-2008, 06:28 AM	#4
Mike Cash Veteran Member Join Date: Jan 2007 Location: Japan Photos: Gallery Posts: 6,950	Is this "myth" something that can be dispelled by reading the manual?

12-29-2008, 06:52 AM	#5
newarts Inactive Account Join Date: Dec 2008 Location: Ames, Iowa, USA Photos: Albums Posts: 2,965	Originally posted by ljfitz cannot get my original k mount lens to work with the k20 need help trying to use a 600mm f8 k type mount What's the problem? In what sense does it not function as you expect it should?

12-29-2008, 07:09 AM	#6
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by JJJPhoto Who manufactured the 600mm f8 lens in question? Even if you set the camera menu to allow the use of manual lenses with aperture rings and use the camera in manual mode you may not get the best results. I remember years ago buying a 500mm f8 mirror reflex lens and swearing that there was something wrong with my camera because whenever I used that lens I couldn't take an image that was correctly focused and the exposures weren't being consistently metered by the camera's in-body light meter. It turned out it was just a REALLY bad lens. It is probably a Sigma lens since it is 600mm.

12-29-2008, 07:25 AM	#8
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,976	Originally posted by IsaacEastgate Go into the custom menus and set enable aperture ring. You can shoot on any of the auto modes as aperture priority, but the lens will stay at f/8. You can shoot in manual mode and use any aperture but the camera will not metre for you until you press the green button. And next time search the forums... And learn how to punctuate sentences.

12-29-2008, 11:15 AM	#9
Sean Nelson Veteran Member Join Date: Sep 2008 Location: Vancouver BC Canada Posts: 353	Originally posted by ljfitz cannot get my original k mount lens to work with the k20 need help trying to use a 600mm f8 k type mount This link will help you. It's written for the K100 but operation on the K20 is almost identical: K100D (Super) Pictorial guide to using manual lenses [imgs]

12-29-2008, 03:47 PM	#11
Miserere Veteran Member Join Date: Sep 2007 Location: Boston Photos: Gallery Posts: 1,993	If it's a mirror lens, shoot in Av.

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