I sat with camera and went through all numbers from 0 till i found perfect centering, heres what i found for 2.5k mode, centering values for 16:9 and 2.39:1 are fifferent.
Heres current centering and new values for 16:9 , resolution 2192x1234
Heres current centering and new values for cinemascope 2.39:1, resolution 2520x1418
I zoomed out to get vignetting visible and determine center of the lens easier, now you can just zoom in and get rid of vignetting perfectly.
Addresses are :
For 16:9:
CMOS5 - 0x2c0
CMOS7 - 0x6aa
For cinemascope :
CMOS5 - 0x2c0
CMOS7 - 0x68b
I will try to find more for oher modes when i have actual lens.
From what i see mcm rewire in 16:9 is not centerd, its shifted down a bit.Ill try to work on that.
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So, i took RAW pic of full sensor and COC( circle of confusion) is still not centered, i dont know but it might be how canon placed mount in front of the sensor, but to be sure i would have to get another c mount lens and compare.
From wht i see after changing values of CMOS7 , it follows the same rule, full image, then it shifts it while revealing white overlay image, then black image then starts to shift actual sensor image with larger values and so on.So IMO it is possible to figure that patter out and make it into the menu so users could shift crop by themselves a bit easier.
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OK, i centered 16:9 mcm rewire 1080p( not working with fullsensor because when image is shifted for 16:9 then it reveals white border on bottom in fullsenor read)
New address is CMOS7 - 0x802
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OK i tried to get that centered in fullsensor ratio but theres white bar, i thought i had it but i still dont
So i have to find a way to check if eos mount is centered with sensor or my actual c mount lens is somehow shifted physically ( i doubt that a lot because when i screwin my lens then vCOC stays in teh same place, if lens would be shifted even a bit then it would hover up/down/left/righ in quite visible manner ) so i put my bet on canon mount not being exactly centered with sensor placement in body on this model.
Im still glad anyway that there is a way to center all modes but fullsensor read when your lens has vignetting.
About consistency of useful image appearing when adjusting CMOS7 values i noticed this :
- When you start from 0x800 and go down 32 steps to 0x7e0 then 32 to 07c1 etc then you will get good image . So there is some pattern to it that could be made into ML menu function to easily adjust framing.Hitting CMOS values blindly is definitely more time consuming.
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Ok i did test with other lens that vignettes and conclusion is the same - canon's mount is off center and COC appears too low on fullframe photos, we can center it in 16:9 with CMOS7 addres 802 (current one is 800) and fix other aspect ratios so theres almost perfect centering.
I suspect there are some lenses that are really offcenter somehow but its 2 lenses already that show the same result.
I think its just how this camera was designed.I might try if 5DII was offcenter as well.
