Upload & Sell: Off
I recently picked up a 300mm f/2.8. I ordered the mk III teleconverters for it, but in the time that it took for them to get to me I ended up picking up a new Kenko pro 1.4x and a Canon 2x mk II to test them against planning on keeping which ever ones did best - considering cost after IQ if they were equal or too close to call. I had all 4 teleconverters with me today and ran a couple quick tests.
I really only cared about the center IQ with teleconverters, so I didn't do any edge crops. All images were taken on a tripod/ballhead combo with mirror lock-up and a remote (crappy weather and light), ISO 400 on a 1d mk III. I used autofocus (none of the combos were micro adjusted). The only oddity was that the kenko metered slightly (maybe 1/3 a stop) brighter than the canons. Should have used manual mode. Oh well.
Here's the test. First shot is the bare 300 2.8. No need to show a 100% crop there, it's ridiculously sharp. The rest are all 100% crops from the center of the image. First up is the kenko pro 1.4, then the Canon 1.4x III, then the Canon 2x II and finally the Canon 2x III. All used the same standard import settings in Lightroom 3.
Nothing groundbreaking really, just something else to pass a Friday afternoon .