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09-05-2008, 07:22 AM   #16
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yes TC's affect quality... how much IQ loss you're willing to accept versus just cropping is something you have to investigate

well on APS-C sized sensor DSLRs, a 1.5x crop factor applies so that in 35mm film terms the lens is like a 450mm lens

09-05-2008, 07:27 AM   #17
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Oh ok, thanks for that.

I think based off what I've heard in this thread, the Bigma is still the best option for me and my trip. Thanks for your thoughts though
09-05-2008, 07:41 AM   #18
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Since you're shooting polar bears, I'm assuming it will be pretty bright. Personally, I think the 18-250 will work fine. The polar bears will probably come up close, and in those instances, you'll need something wider than even the 50mm of the Bigma. Plus, as you've already mentioned, handholding the heavier lenses in the moving vehicle will be tough.

I'm all for adding a second lens (I'd go for the Bigma), but I'd also take the 18-250. With enough light, it will perform to within 90%+ of the other lenses, IMHO, unless you're doing some serious pixel peeping.
09-06-2008, 06:03 AM   #19
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QuoteOriginally posted by rfortson Quote
Since you're shooting polar bears, I'm assuming it will be pretty bright. Personally, I think the 18-250 will work fine. The polar bears will probably come up close, and in those instances, you'll need something wider than even the 50mm of the Bigma. Plus, as you've already mentioned, handholding the heavier lenses in the moving vehicle will be tough.

I'm all for adding a second lens (I'd go for the Bigma), but I'd also take the 18-250. With enough light, it will perform to within 90%+ of the other lenses, IMHO, unless you're doing some serious pixel peeping.
Yeah, it ranges though from what I've heard, and depends completely on the bears activity. My financee is also planning on getting a Pentax and taking that long and using the 18-250 lenses, while I use the Bigma, so I think that could work well actually.

The vehicle won't be moving all the time, it will stop when requested and for a good number of hours for photography. You're on the Buggy from 9am till 3pm.

09-07-2008, 05:49 AM   #20
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Based on the conditions I'll be shooting in, would any lenses filters be necessary or could I get away without one?
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