(2 votes, average: 4.50 out of 5)
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As documented earlier on this site, I had issues with my 300 F4 IS and teleconverters. Well, it appears both items were at fault. I ordered a new Canon 1.4x II TC which also front focused. Upon realizing this, I sent both my teleconverter and 300 F4 IS back into Canon. The combination came back working perfectly. I ultimately sold the Kenko because Canon tech told me they would not touch it, and I wanted a good working TC/300 F4 IS combo.

Upon receiving the unit back from Irvine, I was blown away at how the IQ turned out. I immediately thought, “so this is how a TC should work!”. Based on my experience, I would spend the extra coin for the Canon 1.4x II so you can have it serviced with the lens you plan to use it on. Plus, I noticed better contrast and colors when using the Canon TC with my 300 F4 IS compared to third party TC’s. It also seems to have a more robust build quality along with weather sealing. This does add extra weight though.

These examples were taken wide open(f5.6), hand held. No adjustments were done except for a level 3 sharpening in DPP 3.4.1. Speed was only 1/125th! These are very good results for a 420mm lens handheld at 1/125. Please click the images for the proper sizes.

(4 votes, average: 3.25 out of 5)
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I have to say from the images that the build quality looks too close to the kit lenses. For an estimated retail price of $699, you would except a little better fit and finish.

Canon 18-200 IS

Canon 18-200 IS product page

(3 votes, average: 4.33 out of 5)
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People seem to love their RAW converter comparisons so here we go. Different image this time. All images had *no* adjustments except for 200/ .2 / 0 smart sharpen in Photoshop Elements 5.0. Please click on the images for the full versions.

(1 votes, average: 5.00 out of 5)
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Link

Some of these look excellent.

(4 votes, average: 5.00 out of 5)

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