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04-02-2015, 04:57 AM   #1
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sigma 17-50 with k5iis not so good

I realy like this lens .it is sharp and very useful at most photography cases. works so good with k 3 and catch the focus quickly but when using it with k5iis it has much time to catch the focus .. hunts many times
. this is happening when using the lens at 17 mm as a close up.
your thoughts!
thanks


Last edited by zmohie; 04-02-2015 at 05:55 AM.
04-02-2015, 06:00 AM   #2
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Check for dust on the AF prism under the mirror!
04-02-2015, 01:49 PM   #3
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I also notice that is not so sharp at 17mm, actually the Tamron 18-250 is sharper at 18mm, may be my copy. And diffraction kicks in at lower apertures than other lenses
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