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p.2 #9 · p.2 #9 · Sigma 70-200mm f/2.8 DG DN OS Sports for Sony E and Leica L | |
QuietOC wrote:
The Sony teleconverters do mount on this lens and some of the other Sigma DG DN lenses. It seems to me that the Sigma lens firmware doesn't properly handle whatever the Sony teleconverters add electronically. I am pretty certain it is a lens firmware issue because Sony didn't need to update any camera bodies to support the teleconverters, and they haven't updated the teleconverter firmware either despite releasing new lenses that are compatible with them. My Sigma 100-400 mostly works on the Sony 1.4x after a power cycle.
Sigma may have some agreement with Sony not to make their lenses work with teleconverters, but then why make their lenses mechanically compatible with them? The Tamron lenses which seem to have plenty of room to mount on the Sony teleconverters as far as their optically design, have baffles at their mounts that mechanically block the Sony FE teleconverters. ...Show more →
This Sigma lens is also sold for the L-mount, where teleconverters are not restricted by one manufacturer's cynical licencing restrictions and legal threats, so you can use the L-mount Sigma TC with it.
Therefore the rearmost optical components of this lens had to be spaced far enough away from the sensor (which is a constant, regardless of mount, if you want to save work and design lenses with multi-mount compatibility like Sigma does) to accommodate the elements and long nose of a TC. So it had to be physically compatible anyway.
And it is a good thing to at least have physical compatibility. I presume this means that the lens works in manual focus with the TC, at least? So if you're a landscape shooter who just needs to reach a bit further, you can still use a Sony TC? I'm glad Sigma didn't add any extra baffles to block the physical shape of the TC from fitting in.
I agree that Sony should let the old legal/licencing restriction on TC compatibility die off. It's their fault, not Sigma's in any way, that the lens can't autofocus with TCs.
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