Quote:Poor Klaus is still in mid recuperation, what with all that walking back and forth to the resolution charts, the thought of a further tele-zoom test would probably push him over the edge.
Best settle for reading the Lenstip review which settles the issue with a chart showing the differences between the two, at the long end (the important end) the Tamron pips the C, only the shorter end does the C get the better of it. Of the three reviews, Lentip,Ephotozine and SLR the Tamron beats the C, I know I agonized over the reviews before ordering the Tamron.
The Sport won conclusively though. Ephotozone's review the center at 600mm touched excellent!
This shot of the yellow wagtail is shot at 600mm F11, it really is tack sharp.(slight crop)
Among the uncropped sample images are several taken at 600mm (taken with the 5D II). They are quite sharp but not pixel-level sharp (which is what I define as tack-sharp). Thus if they aren't pixel level sharp on the 5D II, they can hardly be great on the 5Ds R.
Just to mention - if we take the rating at 600mm f/6.3 we get an effective local resolution of ...
- 20.8mp in the center
- 5.7mp at the borders
- 4.8mp at the corners
That is, of course, on the 5Ds R. This figures will be smaller on the 5D II but at least the center will be more than decent here.
FWIW, Tamron's own MTFs do not suggest a great border/corner performance at 600mm.
It is also worth to mention that air diffusion has an impact due to the chart-to-camera distance - no, I do not test in vacuum conditions ... ;-)
As mentioned I will provide equivalent 21mp charts once I have a sufficient number of sample data for the conversion.