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p.1 #6 · p.1 #6 · 1DX: Improved Performance after Service Update | |
PetKal wrote:
That looks good, Dr. Morrell.
I am not sure what you mean by "having to use the focus pre-set button" ?
As a side note, it is not desirable to upgrade lenses and cameras at the same time. Should any operating difficulties be experienced, the cause analysis becomes quite difficult.
For example, I tested all of my MkII long lenses on 1DMkIIN and 1DsMkII which cameras I know rather well. Therefore, any new oddity in performance ought to be attributed to the new lenses.
This new 1DX recall, and its effects on AF, are left to us, the Canon customers, to try to understand and quantify, as usual. If you think you are now getting better performance out of your 1DX + 400 II + 2xTC III setup, that's going in the right direction.
However, I believe that the addition of 2xTC III makes the setup AF performance more stable. Therefore, in some ways a tougher Servo AF test IMO would be to use 400 II alone on 1DX....Show more →
Peter: Thanks for the comments. I've been occupied and delayed answering.
Your point is well taken regarding independent analysis of individual components. However I acquired my "Super" equipment within a relatively short time of each other so there was no extended test of either component for things to settle to a stable state. I thought the 1DX/500 II worked well, so I blamed the problems that surfaced on the 400II, especially since it occurred about the time that it's firmware was upgraded - and I (probably erroneously) suspected that as a source. At any rate I hope thing have settled now.
As for the Preset Button. I really meant the Preset function of the lens (I edited the post to clarify this).
I have the 1DX lens drive option set to "Lens drive when AF impossible: OFF"
I use the Focus Preset button in conjunction with the Playback Ring on the lens to help the AF system by prefocusing approximately within the range of my target. Otherwise the lens will not even attempt to focus. I use this effectively for long range shots, say about 30 meters or so.
If there is a target in the nearest focus limit range (2.7m to 7m for the 400II) and the limit switch in the corresponding position, I find that the AF system needs lots of nudging(and time) to home in on the target. And the Preset feature isn't foolproof in this position. Very frustrating. The 500II behaves similarly and seems worse with TC's.
If "Lens drive when AF impossible: ON" is set, the system seems to behave better, although Canon recommends the OFF position for Super Teles.
Setting the focus limit doesn't seem to guarantee that the lens will find itself in that particular range. One has to physically turn the focus ring to assist it or use the Focus preset feature.
It would be beneficial if the Lens drive options were not so buried in the menu system.
It seems to me that these problems weren't as pronounced before the service update. I don't have my 5DIII at the moment to see how it behaves in this respect. I will do a comparison soon after it is returned.
Well, enough ranting.
Here are some images with the 400II, some with the 1.4X and some with the 2.0:
Edited on Jun 24, 2013 at 02:17 AM · View previous versions
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