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11-17-2011, 08:28 AM   #16
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QuoteOriginally posted by 35mmGun Quote
i have read that the sigma has a tendancy to AF faster than the FA501.4 but i also read in the lens reviews hear that the F501.7 and FA501.7 seem to be rated faster than the FA501.4 as far as AF speed goes so i am a little confused

there are too many options and i am indeed easily confuesd.

lighting levels are sufficient for me to shoot at f2 and so the main criteria for me is AF speed and accuracy, as i am not too concered with achieving edge to edge sharpness as long as centre sharpness is good, which all of the above do very well indeed.

many thanks
Yeah, decisions in the AF department can really only be made when you've got both lenses in your hands to compare directly between... I do know that the Sigma is really fast (because of the HSM) and silent, whereas the screw driven lenses (like the FAs or F lenses) are louder.

11-18-2011, 04:13 AM   #17
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i am actually considering aquiring a few to compare over time.

for some instances noise will not be an issue if focus is faster/more accurate but then again for other situations noise will play a more important role.

so in this instance i will start with the easiest and most cost effective lens i can lay my hands on followed by the next most available/cost effective and then the comparison shall begin.

many thanks
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