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Upgrading tele for wildlife, need suggestions
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<blockquote data-quote="csgaraglino" data-source="post: 599448" data-attributes="member: 42498"><p>It is a well known fact that Nikon bodies (and most Canon) especially the new more sensitive versions cannot Auto Focus at a maximum aperture greater than f8.</p><p></p><p>Nikon states it all over their websites and the forums are fill to the brim with posts talking abut it.</p><p></p><p>Because these both are variable aperture lenses - as soon as you hit native f/6 (with Sigma that's just past 250mm) your done if you have the TC on. Why would any reasonable person spend well over a Grand on something to only be able to use less than 1/2 of it?</p><p></p><p>Just because a company sells a lens/tc combo together does not mean that it will function correctly in all, most or even some specific bodies.</p><p></p><p>The other thing to remember is that Sigma is also banking on the fact that Live View (Canon/Nikon) uses a different AF system and is not limited to the f/8 restrictions and thus can state that AF does work - but if you do a tad bit more homework, you'll quickly see that the majority of folks out there cannot get the combo to work on Nikon (or Canon) at f/8 or beyond via the viewfinder. It's slick borderline deceptive marketing IMO.</p><p></p><p>Knowing this, lets look at your link, it covers Nikon as a mount option, but also Canon and their in-house brand Sigma. I would expect it to work on the Sigma body (their own brand) - but not so much on the other two. Also, right on that page, Sigma has a disclaimer: "...with full autofocus functionality <strong>with most recent</strong> DSLR cameras" and my guess is because most resent cameras have a LiveView function. </p><p></p><p>Nikon addressed this SPECIFICALLY with the 200-500mm just to avoid all the issues that come after f/5.6</p></blockquote><p></p>
[QUOTE="csgaraglino, post: 599448, member: 42498"] It is a well known fact that Nikon bodies (and most Canon) especially the new more sensitive versions cannot Auto Focus at a maximum aperture greater than f8. Nikon states it all over their websites and the forums are fill to the brim with posts talking abut it. Because these both are variable aperture lenses - as soon as you hit native f/6 (with Sigma that's just past 250mm) your done if you have the TC on. Why would any reasonable person spend well over a Grand on something to only be able to use less than 1/2 of it? Just because a company sells a lens/tc combo together does not mean that it will function correctly in all, most or even some specific bodies. The other thing to remember is that Sigma is also banking on the fact that Live View (Canon/Nikon) uses a different AF system and is not limited to the f/8 restrictions and thus can state that AF does work - but if you do a tad bit more homework, you'll quickly see that the majority of folks out there cannot get the combo to work on Nikon (or Canon) at f/8 or beyond via the viewfinder. It's slick borderline deceptive marketing IMO. Knowing this, lets look at your link, it covers Nikon as a mount option, but also Canon and their in-house brand Sigma. I would expect it to work on the Sigma body (their own brand) - but not so much on the other two. Also, right on that page, Sigma has a disclaimer: "...with full autofocus functionality [B]with most recent[/B] DSLR cameras" and my guess is because most resent cameras have a LiveView function. Nikon addressed this SPECIFICALLY with the 200-500mm just to avoid all the issues that come after f/5.6 [/QUOTE]
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Upgrading tele for wildlife, need suggestions
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