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12-04-2019, 01:39 AM - 1 Like   #16
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Thanks for the comparison. Personally I'd be happy to have either. #BeggersCantBeChoosers

12-04-2019, 02:18 AM   #17
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Thank you ever so much for investing the time, effort, and skill to put this together. Interestingly, the DFA seems to offer better contrast with distant subjects and has a clear edge in close-up work. In the other scenarios, the Sigma holds its ground.
12-04-2019, 02:28 AM - 1 Like   #18
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Thank you for the comparison! I had done mine between the DFA and the Bigma 50-500 OS before I sold the Bigma. I believe the DFA is an excellent zoom lens but the Sigmas are good and cheap alternatives and moreover the 50-500 OS offers some advantages over the DFA that are up to the user to decide what is more important for her/his photgraphic needs...
12-04-2019, 11:15 AM   #19
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Thanks for the great comparison. It's given me some very useful information for deciding on a ultra telephoto zoom.

12-04-2019, 11:22 AM   #20
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There are two more little plus points for the sigma: a better case comes with it (decent thick foam padding), and the sigma has a built in strap attachment point on the tripod mount foot. However I think the tripod mount on the D FA is more rigid, the sigmas' flexes a bit too easily for my liking. Don't touch the lens if you want the best results while tripod mounted, and woe betide the effect of any breeze...

Last edited by marcusBMG; 01-23-2020 at 10:21 AM.
12-04-2019, 02:32 PM   #21
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Thanks for extensive comparison. I have Sigma 150-500 OS, and I wondered how DFA performs when compared to it. Well, looks like it in fact performs better (especially at long end), but for me the difference is not big enough to justify extra cost of DFA. Have you had opportunity to compare effectiveness of AF? I do not mean another extensive test, just first impression.
12-04-2019, 03:00 PM   #22
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QuoteOriginally posted by pentageek Quote
opportunity to compare effectiveness of AF?
Not really - I acquired the sigma after i dropped my k3 which affected AF, so not representative. The 150-450mm was good for me with AF, although if the subject was very OoF the camera might hunt ineffectively - qiuicker to manually spin the focus in the right direction until the camera picked up the focus.
12-16-2019, 03:17 PM   #23
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I have now added another set of test pics at the "birding" distance of ~ 5m.

12-17-2019, 03:18 AM   #24
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QuoteOriginally posted by marcusBMG Quote
I have now added another set of test pics at the "birding" distance of ~ 5m.
Thanks one more! The focus breathing is more than I would expect but otherwise the results are as Id expect them. The Sigma lens is good option for Pentax tele work.
12-17-2019, 03:42 AM   #25
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Thanks for the comparison. As others have said, this took a lot of work, but is very useful.
12-17-2019, 04:00 AM   #26
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Thanks for the time and effort that went into this comparison.
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