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Canon Extendet 1.4 II vs. Keno 300D Pro 1.4 - Surprise


sattler123

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I did a comparison test today of those two extenders with my Canon 500mm lens

and to my big surprise, the Kenko seems to be quite a bit sharper than the

Canon. Attched are two 100% crops of the lower right area of a newspaper that I

taped against a wall. I then stood back about 20 yards and took the pictures

with the lens tripod mounted. You can easily read the entire paper from that

distance.

 

Both were shot at ISO800 at f5.6 and 1/400sec - no sharpening was applied to

the image or the crops.

 

Is there such a thing as a bad version of this extender? We always hear about

lens issues, but I have never heard anybody complain about the Tele-Extender.

 

Does this make sense?<div>00NKF5-39808484.jpg.2922db223b72fb70a37e76f6b3336d4d.jpg</div>

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what camera?

 

on my 5D in the corners, the Canon added mild red/green CA compared to the bare lens; the Kenko added a noticeably more severe blue/yellow CA. Outside of the corners I didn't see any real sharpness difference. the situation could be very different on say an XTi, which ought to be quite a bit more revealing of pure on-center resolution but will crop out the problematic corners.

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Maybe this is not a fluke! I can't provide a link, but I seem to recall a lens test by Bob Atkins where he reported superior performance by a 10 year-old, rinky-dink Tamron 1.4X TC compared to the Canon 1.4X TC (1st version). Tamron and Kenko are basically different marketing fronts for the same products.
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<i>Will the Kenko allow auto focus when using the 100-400mm L? It can only be focused manually with the Canon Extender. If auto focus is possible, then I would switch to the Kenko.</i><br><br>

I have three pins on the Kenko Pro taped over and my Canon 100-400 does auto focus even at 400mm.

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