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Occasional Contributor
Posts: 17
Registered: ‎07-09-2013

Teleconverter for 600D with Sigma 70-200mm f2.8 EX DG OS HSM?

I've been reading that 2x teleconverters aren't that great. That they can cause a lot of image quality loss as well as slowing down or even stopping auto focus from working altogether. What do I need to know about teleconverters to make an educated purchase?

Thanks,
Cg.
Canon 6D,Canon EF 24-105mm f/4 L IS USM, Sigma 70-200mm f/2.8 EX DG OS HSM, Sigma 1.4 x EX DG Teleconverter, Canon EF 100mm f/2.8 macro USM, Canon EF 50mm f/1.8, EF 40mm f/2.8 pancake, Sigma AF 8-16mm f/4.5-5.6 DC HSM, Pentax 400mm f/5.6
Esteemed Contributor
Posts: 2,350
Registered: ‎11-14-2012

Re: Teleconverter for 600D with Sigma 70-200mm f2.8 EX DG OS HSM?

This is the best info I know of.

 

http://photography-on-the.net/forum/showthread.php?t=41922

 

Adding a 2X to an f2.8 lens will still allow Af on most bodies because you're now an f5.6 lens. It may degrade the image a bit depending on the specific TC so do your homework before shopping.

 

"A skill is developed through constant practice with a passion to improve, not bought."
VIP
Posts: 11,914
Registered: ‎12-07-2012

Re: Teleconverter for 600D with Sigma 70-200mm f2.8 EX DG OS HSM?

Anytime you add anything into the light path of any lens, you are going to degrade the image quality. Now, that may be a slight or it can be a significant loss.

I have always subscribed to using the original manufacturers accessories and in this case I still think so.

Sigma makes two tele converters that will work with your lens. Both are designed for your lens and retain all features including AF.

The Sigma 70-200mm f2.8 EX DG OS HSM is of such high quality it has room to give up a small amount of IQ, introduced by the tele converter, and still be better that some 70-200mm without one.

 

Another consideration is how big do you intend to make the prints? Do you use a tripod?

So you must weigh all the factors of IQ and cost plus slower AFetcand decide if it is for you.

I recommend the 1.4x over the 2x, though.

EOS 1DX and 1D Mk IV and several lenses!
Occasional Contributor
Posts: 17
Registered: ‎07-09-2013

Re: Teleconverter for 600D with Sigma 70-200mm f2.8 EX DG OS HSM?

@ cicopo. Thank you. That's a hell of a lot of information.

@ ebiggs1. Thank you also for your insight. From the information I have researched so far, I was leaning towards the sigma 1.4.

I'm not buying for a while, so I have plenty of time to learn more.


Canon 6D,Canon EF 24-105mm f/4 L IS USM, Sigma 70-200mm f/2.8 EX DG OS HSM, Sigma 1.4 x EX DG Teleconverter, Canon EF 100mm f/2.8 macro USM, Canon EF 50mm f/1.8, EF 40mm f/2.8 pancake, Sigma AF 8-16mm f/4.5-5.6 DC HSM, Pentax 400mm f/5.6
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