kevindar wrote:
looks like the manual process is too painful for 5d3 based on the posted video. i will wait till he has it fully automated.
It's actually not so bad. I did most of my lenses, some of them zooms with two settings, some of them whites with and without TC - yes it's tedious but still faster that a proper "good old fashioned" procedure.
I closed FoCal, turned of the 5D3 and unhooked it from the computer, and restarted the computer. This didn't solve the problem.
I then unmounted the 24-70 and put the 50/1.4 back on to see if that would help. It didn't. At this point I am unable to calibrate any of my lenses with the software.
Has anyone seen this issue? I sent an email to support but haven't heard back yet. Thought I'd check here.
Alright, I got it working again but now I'm having a different issue. I calibrated my 50/1.2 one more time because the focus didn't seem quite right. I used the exact same target position and distance-to-target on a heavy tripod. The first time FoCal told me to set MFA at -3. The second time it said no adjustment (leave at zero). The third time it said +2.
Granted, these are small increments. But shouldn't it be the same each time if the distance to target is the same?
Does this mean I might have a wacky copy of the 50/1.2?
badlydrawnboy wrote:
Alright, I got it working again but now I'm having a different issue. I calibrated my 50/1.2 one more time because the focus didn't seem quite right. I used the exact same target position and distance-to-target on a heavy tripod. The first time FoCal told me to set MFA at -3. The second time it said no adjustment (leave at zero). The third time it said +2.
Granted, these are small increments. But shouldn't it be the same each time if the distance to target is the same?
Does this mean I might have a wacky copy of the 50/1.2?
No, IMO the software is inconsistent. In 5 readings with one lens I got 0, 6, 15, 15 and 5.
Similar results with another lens though the range was not as pronounced.
badlydrawnboy wrote:
Alright, I got it working again but now I'm having a different issue. I calibrated my 50/1.2 one more time because the focus didn't seem quite right. I used the exact same target position and distance-to-target on a heavy tripod. The first time FoCal told me to set MFA at -3. The second time it said no adjustment (leave at zero). The third time it said +2.
Granted, these are small increments. But shouldn't it be the same each time if the distance to target is the same?
Does this mean I might have a wacky copy of the 50/1.2?
Could be cause by slight changes in the light conditions on your setup - makes a huge difference in FoCal Pro. Your copy is okay, you will sometimes see some deviations in MA, especially at very wide apertures. You can get a better view by just running the MA at a bit of slower speed, e.g. f/1.4 or f/1.8. If you get a MA value which is consistent with one of the f/1.2 values, then take this one.
John_T wrote:
How about the famous 50L focus shift?
This legend - if it exists - only happens at shorter distances to the target. Normally FoCalPro should be run at 50x the focal length (here 2.5 meters).
retrofocus wrote:
Could be cause by slight changes in the light conditions on your setup - makes a huge difference in FoCal Pro. Your copy is okay, you will sometimes see some deviations in MA, especially at very wide apertures. You can get a better view by just running the MA at a bit of slower speed, e.g. f/1.4 or f/1.8. If you get a MA value which is consistent with one of the f/1.2 values, then take this one.
nope, i repeated my tests with studio lighting and the EV values for both indoor and outdoor were the same for all readings. I just think the software is not deterministic.
retrofocus wrote:
This legend - if it exists - only happens at shorter distances to the target. Normally FoCalPro should be run at 50x the focal length (here 2.5 meters).
In my experience it exists, but only at distances shorter than 1.20 meter
jzucker wrote:
nope, i repeated my tests with studio lighting and the EV values for both indoor and outdoor were the same for all readings. I just think the software is not deterministic.
I recommend testing it as I described above maybe at f/1.4 and f/1.8 for example. You should definitely see a better consistency then. In my expereince the AF - at least of the 5D II - is sometimes not super reliable at very fast speeds. And this can mess up the algorithms used in the software.
jzucker wrote:
nope, i repeated my tests with studio lighting and the EV values for both indoor and outdoor were the same for all readings. I just think the software is not deterministic.
I have had a couple of lenses that did not work well with particular bodies. That will show up in FoCal. I sent one of the worst offending lenses to Canon and they replaced some stuff in it, and now it works very well.
Also, my 100L was super flaky with my 7D and FoCal results showed that... Then I dropped my 7D by accident (not with the 100L), and that lens is now MA'ing at 0 and working perfectly. It should not happen that way and my logical mind doesn't like it, but I don't think the problem was with the lens or with FoCal. The 7D seemed to benefit from a good thump (as Fonzie hits the jukebox).
