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08-05-2015, 06:20 PM   #16
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Thank you everyone, looks like the Sigma 50-500 and 70-200 f2.8 are both the DG versions. So unless I break one of them I will only need to get the FF camera. But of course I will always look for new lenses.

Jim

08-06-2015, 05:45 AM   #17
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QuoteOriginally posted by jbrowning Quote
70-200 f2.8 are both the DG versions.
Actually, 70/80-200/2.8 is THE classical full frame tele zoom.

Variants (50-135 for APSC or 35-100 for FourThirds) have been made for smaller sensor cameras, but at full 70-200, all lenses of this zoom range (Canon, Nikon, Pentax, Sony, Sigma, Tamron) are full frame.

The Pentax DA* 60-250/4 is close to this range and its original patent is for full frame indeed. However, it is weaker than average (although not unusable) on full frame corners, compared to a classical 70-200 zoom. I'd like to see Pentax adjust its optical design (remove the APSC optimization) and release a DFA* 60-250/4. Because that's a lens missing from other systems and the corresponding 70-400s are all heavier.

Last edited by falconeye; 08-06-2015 at 05:53 AM.
08-06-2015, 07:26 AM   #18
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QuoteOriginally posted by jbrowning Quote
Thank you everyone, looks like the Sigma 50-500 and 70-200 f2.8 are both the DG versions...SNIP
All Sigma 50-500 and 70-200 lenses are full frame. They never made a smaller version for APS-C. There are multiple revisions with tweaks over time but they all have the full frame image circle.
08-06-2015, 09:30 AM   #19
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QuoteOriginally posted by DeadJohn Quote
All Sigma 50-500 and 70-200 lenses are full frame. They never made a smaller version for APS-C. There are multiple revisions with tweaks over time but they all have the full frame image circle.
The 50 - 150 2.8 for APS-C seems to have been discontinued for all mounts now (pentax went years ago) so perhaps making crop versions of the longer zooms doesn't attract enough custom.

08-07-2015, 03:58 AM   #20
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QuoteOriginally posted by falconeye Quote
[...]I'd like to see Pentax adjust its optical design (remove the APSC optimization) and release a DFA* 60-250/4. Because that's a lens missing from other systems and the corresponding 70-400s are all heavier.
I'd love to see that too, if they can keep the quality of the 60-250mm. On FF, I'd give up F/2.8 for F/4 to gain a little more reach without compromising anything else (not that I don't see the appeal of a 70-200/2.8).
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