In Body SR vs. Sigma OS

Docrwm · 12-05-2014, 04:39 PM

Originally posted by promacjoe

I have two Kenko Teleconverters That I carry, a 1.5 and a 2x, mainly for an 80-200 F2.8. Although, If the conditions are right both converters can be used on that lens, I only use the 1.5x with that lens, When I have no other choice. Sigma makes one that is designed for that type of lens.

Have fun with your new toy. And don't pay any attention to those who say it is not sharp at wide open aperture. Used correctly, it is a extremely sharp lens.

Thanks. Sigma's website specifies that their teleconverter will not work on the Pentax model. No reason stated. Perhaps its like the lens not having OS (which it does) and they are just wrong?

promacjoe · 12-05-2014, 06:55 PM

Originally posted by Docrwm

Thanks. Sigma's website specifies that their teleconverter will not work on the Pentax model. No reason stated. Perhaps its like the lens not having OS (which it does) and they are just wrong?

I have not seen the Sigma website information, I was going by the B&H website for that particular lens, When I bought it, it stated that the Sigma Converter was compatible with that lens. Note: B&H has revise there website, It now states that this lens is not compatible with the Sigma tele-converter. however, I have used my Kenko 1.5 tele-converter With the Sigma 150-500, with good results. although it is not something that I like to do.

PS, I have a K3. And the autofocusing capabilities of the K-3 is better than any of the other Pentax cameras. They maybe placing that disclaimer on the website for those cameras with focus capabilities that are not up to par with the K-3.

**boriscleto** · 12-05-2014, 07:29 PM

Originally posted by promacjoe

Sigma makes one that is designed for that type of lens.

Not in K-mount. Sigma no longer makes a 1.4x or 2x converter for Pentax. The 1.4x had a protruding front element and did not have HSM. The front element may not have been a problem, but the lack of HSM is.

12-05-2014, 06:55 PM	#17
promacjoe Veteran Member Join Date: Jun 2014 Posts: 340	Originally posted by Docrwm Thanks. Sigma's website specifies that their teleconverter will not work on the Pentax model. No reason stated. Perhaps its like the lens not having OS (which it does) and they are just wrong? I have not seen the Sigma website information, I was going by the B&H website for that particular lens, When I bought it, it stated that the Sigma Converter was compatible with that lens. Note: B&H has revise there website, It now states that this lens is not compatible with the Sigma tele-converter. however, I have used my Kenko 1.5 tele-converter With the Sigma 150-500, with good results. although it is not something that I like to do. PS, I have a K3. And the autofocusing capabilities of the K-3 is better than any of the other Pentax cameras. They maybe placing that disclaimer on the website for those cameras with focus capabilities that are not up to par with the K-3. Last edited by promacjoe; 12-05-2014 at 07:03 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Optical IS (in lens) vs optical SR (body sensor shift) vs DS (pixel tracking)	rburgoss	Canon, Nikon, Sony, and Other Camera Brands	10	10-20-2014 07:07 PM
Sigma 50-500 OS vs non-OS	Rmagers	Pentax SLR Lens Discussion	9	07-24-2013 06:34 PM
SR Vs OS, which works better?	Reportage	Pentax SLR Lens Discussion	17	06-03-2012 10:20 AM
In-Body SR vs. In-Lens SR Pros and Cons?	uchinakuri	Troubleshooting and Beginner Help	32	09-23-2010 09:42 PM
Can Sigma OS lens be used with SR?	amphysics	Pentax SLR Lens Discussion	6	06-19-2009 08:58 AM

12-05-2014, 04:39 PM	#16
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285 Original Poster	Originally posted by promacjoe I have two Kenko Teleconverters That I carry, a 1.5 and a 2x, mainly for an 80-200 F2.8. Although, If the conditions are right both converters can be used on that lens, I only use the 1.5x with that lens, When I have no other choice. Sigma makes one that is designed for that type of lens. Have fun with your new toy. And don't pay any attention to those who say it is not sharp at wide open aperture. Used correctly, it is a extremely sharp lens. Thanks. Sigma's website specifies that their teleconverter will not work on the Pentax model. No reason stated. Perhaps its like the lens not having OS (which it does) and they are just wrong?

12-05-2014, 07:29 PM	#18
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by promacjoe Sigma makes one that is designed for that type of lens. Not in K-mount. Sigma no longer makes a 1.4x or 2x converter for Pentax. The 1.4x had a protruding front element and did not have HSM. The front element may not have been a problem, but the lack of HSM is.