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07-24-2015, 01:21 AM   #1
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K5II overexposure on modern lensens only

A weird problem with my k5II is that it tends to overexpose massively with my modern lenses, which are the kitlens, DA35/f 2.4 and a DA40/2.8 i borrowed. I almost exclusively shoot in munual mode using the green button to set exposure if i need it set quickly. Interestingly, it works great when i use pentax-M lenses or m42s, which makes me think its a software problem rather than a mechanical one. Any suggestions here, as for theres nothing but to guesstimate exposure time and aperture

Thanks,
Sander

07-24-2015, 03:45 AM   #2
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set your aperture to f22 or higher and shutter to 1 second look into the lens and press the shutter button to see if the aperture is working
07-24-2015, 04:08 AM   #3
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Lowell Goudge's Avatar

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What is the level of over exposure? You should check the linearity of the mechanism. You can do this by setting aperture with the dial and letting the camera set shutter speed, and the measure the greyscale value at each setting. My tamron 28-75/2.8 has an error in aperture which leads gradually to a +1 stop over exposure when at F32. It's perfect at F2.8
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