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jbrowning · 08-05-2015, 06:20 PM

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

falconeye · 08-06-2015, 05:45 AM

Originally posted by jbrowning

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.

DeadJohn · 08-06-2015, 07:26 AM

Originally posted by jbrowning

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.

mohb · 08-06-2015, 09:30 AM

Originally posted by DeadJohn

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.

Mazhe · 08-07-2015, 03:58 AM

Originally posted by falconeye

[...]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).

08-06-2015, 05:45 AM	#17
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by jbrowning 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.

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08-05-2015, 06:20 PM	#16
jbrowning Veteran Member Join Date: Sep 2007 Location: Colorado Photos: Gallery \| Albums Posts: 996 Original Poster	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, 07:26 AM	#18
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,834	Originally posted by jbrowning 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
mohb Veteran Member Join Date: Feb 2010 Photos: Albums Posts: 1,912	Originally posted by DeadJohn 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
Mazhe Senior Member Join Date: Jun 2012 Photos: Gallery Posts: 139	Originally posted by falconeye [...]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).

Longer lenses?

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