Surprised: 800mm - Sigma 400mm f5.6 with a 2X Teleconverter

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Michael
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Older version of the lens (APO Telephoto Macro HSM) , used on a Canon D60

b9dca98a.jpg
 
On the MKIV it only works open wide (f5.6) but it is still very sharp.
Will put more photos on that one soon.

I heard about aperture.
Does the AF still work, and how accurate is it? Any other issues?
 
I heard about aperture.
Does the AF still work, and how accurate is it? Any other issues?

AF works perfectly and is very accurate (HSM motor, albeit an older version that is not completely silent). No other problems. On the MKIV AF works with the 1.4TC making the lens 560mm f8. At 800mm f11 it still works but with manual focusing and it is not as sharp as I would want it to be as I cannot step it down a tad more as I can do with the D60.
 
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