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Thang wrote:
agreed with you there. The bare 600 IS II and the older 600 f/4G do not need to stop down for the ultimate IQ when used in the field based on what I have experienced.
In addition - "Both lens and TC combinations were quite soft when shot wide open (i.e., at f5.6) but sharpened up somewhat by f6.3 and more by f7.1." This was never an issue with the 600 IS II.
Yes, that really worried me, I can never tell the difference of a 600 vs 840 shot with the 600II and sounds like you have found the same even with the older 600 G and your previous 600II.
Have a look at the detailed field maps from DXOMark for the 600II....there is no difference what so ever stopping down. Absolutely nothing you would notice in real world shooting. https://www.dxomark.com/Lenses/Canon/Canon-EF-600mm-F4L-IS-II-USM-mounted-on-Canon-EOS-5DS-R---Measurements__1009
DXO hasnt tested the new 500 and 600 FL E lenses. But I did notice that their test does show the 400 2.8 FL E improves at f/5.6 over f/4 and f/4 over f/2.8. You need to click back and forth on the 2,8 and 4 and the 4.0 is a darker green. If you look at the graphs for profiles the Nikon 2.8 FL improves a bit more at 5.6 as well. The 600II from Canon shows no colour difference clicking back and forth. So maybe Canon does have an advantage here. However, the Nikon is rated at a slightly higher P-Mp 36 vs 32 so the Nikon might just be that much sharper to begin with compared to the Canon. The Canon 400 2.8 II is 38 score in P-Mp but I can't find the detailed measurements for that lens on DXO??
When looking at DXO measurements click on Sharpness and then look at Field Map and/or Profiles
Edited on Jan 12, 2017 at 12:34 PM · View previous versions
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