Manual lens - green button - stop down meassure
Not sure why this should be the case though!
If there's a solution which doesn't involve using a lighmeter or fitting an A lens to meter, I'd also be interested to know.
If you search the forum, you should be able to find plenty of info.
If not it wont work!
Secondly i found the best method of using manual lenses on k20d is to have the camera set to fully manual and when holding the optical preview switch in place turn the dials to set your exposure and speed until the green hexagon lights up and exposure meter is in centre.
Hope thats some help.
K20D, PENTAX DA 18-55, TAMRON DI 70-300, PENTAX SMC-K 135 f2.5
www.ajohnson-photography.co.uk
But I think Niklas has found a limitation of the metering system when using non-A lenses... 3" is the limit of the shutter speed it displays / selects.
Thats the method I use with them so hopefully will work for you guys to
K20D, PENTAX DA 18-55, TAMRON DI 70-300, PENTAX SMC-K 135 f2.5
www.ajohnson-photography.co.uk
Thank you very much.
However, it did not yet solve the ~4-stop underexposure I experience in low light conditions.
So if anyone has an input on this issue, bid in.
Elsewise I will hold on to Mannesty's explanation that it's a known and described issue.
Niklas
It may well be that this is technically solveable, but if that means the cameras became uncompetitive compared to other marques, then it would not happen.
If you look at the instruction manual, Pentax tell us that exposure may not be accurate.
I have found the metering with K lenses to be reasonable.. occasionally a half to a stop out, but very usable.
However shutter speeds longer than 3" are simply not available, which explains Niklas's problem of gross underexposure.
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56 posts
14 years
Denmark
Aperture is manual - without the A setting on the aperture ring.
Focus is manual as well. Not relevant in this post though.
My problem is that I find the meassurement of my K20D camera, with the Stop Down function on the Green Button or with Optical Preview, to be underexposing a lot in low light.
It is as much as four to six exposure stops wrong.
I.E.: F22. Stop Down and Optical Preview show the same meassurement: 3''
Correct Exposure is 30''
This goes for both lenses.
Is this normal?
Is there a way out?
Niklas