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03-29-2009, 05:25 PM   #1
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Join Date: Oct 2008
Location: London / Southampton
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Wierd Vivitar...

My new Vivitar (Kiron) 105 f/2.8 appears to have a strange communication issue with my K20D; the camera believes the minimum aperture to be f/4.5 and stops it down accordingly When used with stop down metering the lens works fine but any automatic control programs cause the same problem. I've got quite a few legacy and third party "A" lenses and never seen this before! Any ideas? I Haven't been able to test this on another pentax A camera yet, but I'm pretty sure its the lens. Help!


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