September 02, 2014, 11:20:32 PM

Author Topic: Kenko TC and AF at F8  (Read 8730 times)

Mt Spokane Photography

  • Canon EF 600mm f/4L IS II
  • ********
  • Posts: 8490
    • View Profile
Re: Kenko TC and AF at F8
« Reply #30 on: October 18, 2012, 10:19:29 PM »
I think that the system was not intended to do well at f/8, but they decided that it was good enough for most usage.  Certainly, my 5D MK III did very well with the Kenko 1.4X and 100-400 while at 400mm.  At least until the Kenko died.  Everything is working fine since I removed the TC.

canon rumors FORUM

Re: Kenko TC and AF at F8
« Reply #30 on: October 18, 2012, 10:19:29 PM »

neuroanatomist

  • CR GEEK
  • ********
  • Posts: 14047
    • View Profile
Re: Kenko TC and AF at F8
« Reply #31 on: October 18, 2012, 10:53:35 PM »
There was some focus hunting when shooting birds in dense foliage with backlighting

Here's a shot that shows the bird and surround, a tough job for any AF system.  This was with phase AF, and I haven't done an AFMA yet (need to find a deserted football field for that!).  Might be a little back-focused, I think.

Shot is with the 1D X and 600mm f/4L IS II + 2xIII, 1/320 s, f/8, ISO 4000.  Original and a 100% crop to show detail, which is quite good, IMO. 
EOS 1D X, EOS M, and lots of lenses
______________________________
Flickr | TDP Profile/Gear List

Mt Spokane Photography

  • Canon EF 600mm f/4L IS II
  • ********
  • Posts: 8490
    • View Profile
Re: Kenko TC and AF at F8
« Reply #32 on: October 19, 2012, 02:06:36 AM »
Wow, the backlighting is tough to deal with.  It might be a hair backfocused. 
I had the older non is 600mm f/4.  It was too much for me to haul around and setup, but it did a great job.  I finally resigned myself to making do with my 100-400mmL, and its pretty good.
 

WesternGuy

  • PowerShot G1 X II
  • ***
  • Posts: 42
    • View Profile
Re: Kenko TC and AF at F8
« Reply #33 on: October 19, 2012, 03:28:25 AM »
Neuro, wow - that looks great - I can hardly wait to get my 600mm II.

WesternGuy

canon rumors FORUM

Re: Kenko TC and AF at F8
« Reply #33 on: October 19, 2012, 03:28:25 AM »