JMDobson Offline Upload & Sell: Off
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Thank you all so much for the responses. This info is exactly the kind I need. I have been leaning towards the AFS-II version for a while, and this helps solidify that idea. I will respond in the order of posted.
Mitch: I wish I didn't need to follow the play so hard with my 300. I want to fill the frame more, but the focusing capabilities are what I am really trying to improve. Last night I was shooting at a game where the brightest spot on the field was ISO 25600 @2.8 1/400th I'm thinking a clean prime lens might have a higher T-stop than this big zoom, and could really help the camera find focus.
Next39: Thank you for chiming in with experience from both lenses. After printing on the newspaper, the image looses enough quality that if the focus is the same, I don't see a reason to spend the extra cash.
John: Thanks for taking the time to reply. I know there are excellent pieces of older glass out there, and I have used some of the 300mm versions and the 400 3.5AIS. Yes, I am paying for the lens myself, however, I'd be able to afford the lens with enough prep ahead of time. I'm not freelancing, so I can rely on a steady paycheck from shooting, so it all comes down to just being frugal if I can get away with it. I figure I'd sell the sigma after the 400 purchase to recoup about half the price.
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