Pages: [1]   Go Down

Author Topic: Canon 100-400 v2 center to corner sharpness  (Read 1240 times)

OneSparrow

  • Newbie
  • *
  • Offline Offline
  • Posts: 7
    • OneSparrow Images
Canon 100-400 v2 center to corner sharpness
« on: June 20, 2015, 04:00:05 pm »

Have done a quick look of the center to corner sharpness of this lens.  The image file is a crop, where the actual center of the taken image is top right, and a corner is at bottom left.  Taken at 400mm, f5.6, totally perpendicular to the test target.  

I know that this is quite a rough test, but if anyone has any experience with this lens - can you tell me if this variation between the center and corner is usual or not.  I'm used to my 400 5.6 prime, which does not show nearly such variation.  Thanks for your comments.
« Last Edit: June 20, 2015, 04:14:05 pm by OneSparrow »
Logged

stever

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 1250
Re: Canon 100-400 v2 center to corner sharpness
« Reply #1 on: June 20, 2015, 05:22:29 pm »

that looks like quite a bit of resolution loss to the corner

I tested my 100-400 ii with an Imatest target and software and compared it to my old 100-400 and test results from the 400 f5.6 (which I no longer have).  The new 100-400 was sharper in the center and significantly sharper in the corners at f5.6 than the old lens  (more like the old lens at f5.6) and a little less sharp in the corners than the 400 f5.6 - measurable, but not really noticeable.  My bottom line was that it's not necessary to stop down to f8 for resolution with the ii and that there wasn't a  significant difference with the 400 f5.6.

I'll review the numbers when I get a few minutes.
Logged

OneSparrow

  • Newbie
  • *
  • Offline Offline
  • Posts: 7
    • OneSparrow Images
Re: Canon 100-400 v2 center to corner sharpness
« Reply #2 on: June 20, 2015, 05:34:56 pm »

Thanks stever,

I am also seeing that same level of corner blur at f/9.  And I should add that tests are done with a full frame camera, so the test image is not just what tends to be the more-middle sweet spot of the lens
Logged
Pages: [1]   Go Up