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Forum: Pentax SLR Lens Discussion
12-12-2010, 07:49 PM
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I've been looking at the Sigma 300 2.8 coupled with their 2x TC. According to their documentation, anything over f 5.6 doesn't autofocus well (I've seen varying accounts of this...). That would be my main desire for a 'fast' lens - the ability to strap a TC onto it and still capture good photos.
But, the other thing comes down to my individual setup and wants.
The K10D sucks at high ISOs - so that seriously limits 1/3 of my options (aperture, ISO, shutter speed) when shooting wildlife. I do plan to upgrade to the K-5 at some point in time which will help. The other piece is a lot of the shots of what I want are best taken early or late in the day. For example, I can go back to Nebraska and take pictures of dozens of whitetail deer all in one spot at sunrise or dusk. Because it's darker (and I'd like action shots - not grazing shots), I have to either slow shutter speed (bad for action) decrease aperture, or increase ISO. As such, the faster lens I have the better because it provides me with more options.
The question I have to ask myself is simple: Is the extra cash (~$1800 between the DA 300 f4 and Sigma 300 f2.8) worth what I can do with it or do I pursue other options that may give me the same results? I debated this a month or two ago with another forum member and they made some good points. The question comes down to how much is the extra stop of flexibility worth to me?
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