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02-05-2015, 07:30 PM   #16
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Lowell Goudge's Avatar

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QuoteOriginally posted by Not a Number Quote
When I use my DA lenses on my K10D with my 6 pin Vivitar Macro Focusing 2x TC they get treated as if they were manual focus "A" lenses. I have to set a focal length for SR, the widest rated aperture will show as the widest no matter what focal length is in use, the EXIF data will not show lens model/name or set focal length information.

As I recall there was some discussion that some Sigma lenses behave differently on teleconverters even if the data pin is present (and functional).
I can confirm the pentax lens behavior,

As for sigma on Sogma TC the issue is that they feed throug data in modifi d, therefore native aperture is wrong for P-TTL flash and native focus length is wrong for all exposure curves in program mode and shake reduction

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