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08-18-2009, 10:22 AM   #1
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Sigma 70-250 1:3.5-4.5 KA mount lens on Samsung GX20

I have the Sigma lens and i'm using it with a Samsung GX20 body.
It is a KA mount so should be able to use the Av mode and it works .. but i cant set the maximum aaperture of 3.5(at 70) .. the maximum i can set is 6.7.
Also the minimum i can set is 45 when it should be a minimum of 22 at 70mm.

Is there something wrong with the lens or is it normal for a KA manual lens?

Sorry if it's been discussed before but I searched and couldn't find something.


PS .. first MF lens i use

08-18-2009, 12:19 PM   #2
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QuoteOriginally posted by DasModell Quote
I have the Sigma lens and i'm using it with a Samsung GX20 body.
It is a KA mount so should be able to use the Av mode and it works .. but i cant set the maximum aaperture of 3.5(at 70) .. the maximum i can set is 6.7.
Also the minimum i can set is 45 when it should be a minimum of 22 at 70mm.

Is there something wrong with the lens or is it normal for a KA manual lens?

Sorry if it's been discussed before but I searched and couldn't find something.


PS .. first MF lens i use
I don't know that particular lens. But generally speaking, this is NOT the normal behaviour of a KA-lens. You should be able to read the maximum aperture correctly and any other setting too. KA lenses work just as fine as the current AF lenses, except for the AF...

Ben
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