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| p.1 #11 · Strange front-focusing problem with Sigma 35/1.4 |
Welcome to my world with the FoCal program!
I find it highly inaccurate anymore. Back when the program was new and only worked with the 5D2, it was highly accurate for me. Been using it since the beta days... LOVED the program back then...
I find it has gotten worse over time, only getting more fancy with its feature-set.
With my 5D3, properly setup at EV +10 or more, outside light, inside light, completely level/measured, 25x or 50x focal length, etc... I get some varying results even though it says its perfect. I have tried different papers, sizes, everything. Nothing helps get me accurate results.
Had my 70-200 II tested over and over at something like +3W and +8T... With a TC, it was something like 0W and +6T. My 24-70 II tested at -2W and +3T... 85 1.8 at something like -7...
Mind you, the body and lenses were sent to Canon for calibration (body, 70-200 II and TC all together)... Afterward, the tests showed slightly less away from 0, but still consistently giving me the same (+) numbers. Real world results were terrible. Set all back to 0 and images are MILES better. Canon properly did the calibration to the body... FoCal was giving me "Excellent" results with very defined bell curves to the MA value it would give me. I should just trust Canon and leave it all alone (which I do now).
Same with the 70-200 + TC... Gave me some +4 and +6 or something. Causing backfocus on real-world shots. Set all to 0 and perfect. Was bummed because many of my aviary shots that weekend were ruined.
My 85 was most crazy though... Tested over and over and got -7 at (3) different distances and types of light. Real world shooting showed very noticeable front focus. Put back to 0 and perfect.
24-70 II was the ONLY lens it got right on the wide end (-2)... The tele end best at 0 and not +3.
Not sure what is up with Focal, but it simply does not work for me anymore. Before people try to claim its the target setup, trust me, its not. I did both 25x and 50x the FL of the lens, measured to make sure everything was level and parallel, very sturdy tripod, remote release, mirror lockup time extended, lighting was even and consistent (with halogen, natural light, shade/direct, etc...). Program spits out excellent test results but simply does not play well with real-world shooting, at all.
Camera was checked/adjusted/calibrated by Canon, as were the lenses. With real-world shooting, I notice NO focus issues. Spot on actually, as long as I don't use the FoCal values...
Again, used to LOVE the program. Back when it first came out, I did my MA via LensAlign and FoCal matched those values almost EXACTLY in a fraction of the time. After the target changes and all the "updates", it simply does not give me good results. I want to love the program like I used to, but it simply does work with my 5D3 and lens collection for whatever reason.
After all the headache with FoCal, my lenses CLEARLY perform best with no MA anymore, granted, the 70-200 and TC combo was calibrated directly so should be perfect. But the 24-70 II and 85 never were. My 5D3 has been at Canon for check/clean twice this past year and have been checked/adjusted as needed.
70-200 II : 0W/0T
70-200 II + 1.4x TC : 0W/0T
24-70 II : -2W/0T
85 1.8: 0
My advice to you would be to step away from Focal and if its front focusing, add (+) values until you get good results. See if that fixes your issue. Ignore what FoCal is telling you, because yes, it lies.