1.4x Teleconvertor, Canon vs Kenko

Myrgjorf wrote:

If you can afford it you should consider to complement your 6D with a 70D for wildlife and BIF - I did. With the 100-400L there is no way you can get the same IQ from the 6D with a TC as you get from the 70D. You will have some more benefits from that setup:

• The 70D gives you 1.6x without degrading IQ (at lower ISO)
• Your 6D / 70-200/f4 is immediately ready for everything else without swapping lens
• You can enjoy the 70D's superior AF + burst rate especially for BIF
• Handling the 6D and 70D is very similar (though the 70D is a little bit better) so it easy to switch between them

I have the Kenko C-AF 1.4X Teleplus Pro 300 which auto focuses perfectly fine on both the 6D and the 70D, both with LV and OVF without any taping. But the Kenco 1.4x kills IQ on both the 6D and the 70D so I rarely use it.

I did the "which wine" test with the 100-400L @400mm with all combinations of 6D /70D, no TC / Kenko 1.x, OVF / LV. The 70D without TC gave the best results with no difference between OVF and LV.

My 100-400L rarely leaves the 70D and the 6D is ready for most other things. The 6D and 70D complements each other very nicely as the strength of one of them covers the weakness of the other.

("which wine test": put a wine bottle e.g.50 meters from you and shoot the label. Read as much from the label as you can. Wine labels tends to have several lines with different font sizes.)

This also something that I am seriously considering.

I still have a couple of EF-S lenses from my previous crop body and I was thinking a 70D body would help me make use of them, as well as giving me the extra reach with the telephoto lenses.
I don't normally do much bird photography, but on the occasions that I do a 70D would be a useful tool for the extra reach, plus I also like the articulating screen for doing macro shots, since one of the EF-S lenses I have is the 60mm Macro and I want to make more use of it.

Decisions, decisions...