KevinRA
•
Senior Member
•
Posts: 1,457
Re: Canon R7, Ef 100-400 ii and 1.4 Tc Bif Photos. Are these acceptable?
1
OlcayK wrote:
Victor Engel wrote:
In my testing with EF 100-400 II lens and a bunch of different teleconverters, including the Mark III Canon ones, there was no improvement with any of them over using the lens by itself and resizing. That was using a Canon 5DS. The pixel pitch on the R7 is smaller than with the 5DS, so I would expect no improvement on the R7 either. The lens simply isn't sharp enough to gain an advantage with the TC. But maybe you have a sharper lens than I have. It doesn't appear so, though, from the photos.
Are there sample variations in this lens? I read the first version really suffers from this.
So no gain with the tc at all? I saw some great images on the net even with the 2.0 tc.
If you compare the 5DSR with a 2X converter, this would equate to a R7 with a 1.4X converter.
You can see here the IQ is just not quite there - compare to the 600II plus 1.4X as another another way to get to 800mm in this 5DSR test. This is under test conditions, in the field likely a little worse since focus errors may also creep in.
https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=972&Camera=979&Sample=0&FLI=6&API=3&LensComp=748&CameraComp=979&SampleComp=0&FLIComp=1&APIComp=0
Now it is not that the EF100-400 II is not a good lens - without the 1.4X TC even on a R7 it is quite good. Compare to a lousy lens as in this comparison even without TC:
https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=972&Camera=979&Sample=0&FLI=5&API=0&LensComp=776&CameraComp=979&SampleComp=0&FLIComp=4&APIComp=1
(R7 = 5DSR with 1.4X TC in centre)