There is talk around the net about an upgrade to the Canon 100-400 IS with improved image stabilization and improved optics. It’s unclear wether or not it will be a push pull design.

Guesstimated price = $1899

(6 votes, average: 4.67 out of 5)

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All of the images were shot using F8, RAW, tripod, remote, mirror lockup using a Rebel XT and a Canon 300 F4 IS L. Each image has had zero color or contrast processing, but they have each had a level 4 sharpening done in DPP.

The Canon is $290 retail, and the Kenko is $190 retail. Please click on the thumbnails for the full images.

The first examples were done using manual focus.

Crops:

Things look pretty even when using manual focus at F8. Let’s check out the autofocus results using one shot AF:

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