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05-26-2010, 07:28 AM   #1
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Pentax LX + 28mm

I recently bought a Pentax-M 28mm 2.8 to go along with my trusty SMC-A 50mm 1.4 and I've noticed that almost every single photo I've taken with the 28mm is underexposed when using my Pentax LX. I've had no issues at all with the 50mm or my 135mm, but the 28mm is underexposing at least one stop. The lens seems to be in perfect shape so I have no idea what the issue is. Has anyone else had this problem?

05-26-2010, 07:38 AM   #2
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I don't think any kind of defect with the lens will cause underexposure (over exposure can be caused by sticky aperture blades) so my guess is that it's the metering.

What happens if you meter for a scene with your 50mm, shoot, and compare that to 28mm shot at same aperture/shutter speed?
05-26-2010, 07:45 AM   #3
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Good question, I haven't done any formal tests with it yet. I just got my NYC vacation pics back yesterday and noticed the issue. I'll try and run a cheapo 24 exposure roll through it this weekend and do that. Hopefully I can just correct the issue with the exposure compensation dial.
05-26-2010, 10:28 AM   #4
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I use a M28/2.8 with my LX and haven't had any problems with exposure - is it possible it's down to technique?

The LX uses a centre-weighted metering system and shots outdoors with any wide angle lens will include more sky than those shot with a "normal" lens - this can have quite an effect on the outcome as the light in the sky is given more prominence than it's due. The trick is usually to point the camera down and lock a reading from a patch of grass (or any midtone) before recomposing and shooting.

Do you have the same underexposure problem indoors? If not then the above is where I would put my money.

05-27-2010, 07:16 AM   #5
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It is possible that the aperture lever is bent.

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