Hi All,
Yesterday afternoon I shot pictures at a soccer match. One combination 5D Mark III, EF 400mm f2.8L IS II and EF 1.4X III gave me terrible results. Everything was severely back focused. I do AFMA my lens/body combinations occasionally and normally they are spot on.
This body/lens combo AFMA'ed at +9 on 10/7/2014. I didn't bother to re-calibrate it for yesterday's game and I know lenses/bodies change but I wouldn't have expected such a huge change. Today I re-calibrated the body/lens combination and ended up with a -9. That's an 18 point swing. I have done several test shots after re-calibrating and the body/lens combination now appears to be spot on.
What concerns me is the amount of swing. 18 points seems incredibly large. Neither the body or the lenses have been dropped, banged, etc.
The 400mm f2.8L IS II was spot on, on my 1DX during the same game, however I wasn't using the teleconverter in this combination. Also, I shot a bit with the 5DIII and a 70-300mm L, which was also spot on. This leads me to believe that my 1.4X III teleconverter might be the culprit.
Has anyone else here experienced such a huge change in AFMA that wasn't caused by some other event such as dropping a body or lens?
Yesterday afternoon I shot pictures at a soccer match. One combination 5D Mark III, EF 400mm f2.8L IS II and EF 1.4X III gave me terrible results. Everything was severely back focused. I do AFMA my lens/body combinations occasionally and normally they are spot on.
This body/lens combo AFMA'ed at +9 on 10/7/2014. I didn't bother to re-calibrate it for yesterday's game and I know lenses/bodies change but I wouldn't have expected such a huge change. Today I re-calibrated the body/lens combination and ended up with a -9. That's an 18 point swing. I have done several test shots after re-calibrating and the body/lens combination now appears to be spot on.
What concerns me is the amount of swing. 18 points seems incredibly large. Neither the body or the lenses have been dropped, banged, etc.
The 400mm f2.8L IS II was spot on, on my 1DX during the same game, however I wasn't using the teleconverter in this combination. Also, I shot a bit with the 5DIII and a 70-300mm L, which was also spot on. This leads me to believe that my 1.4X III teleconverter might be the culprit.
Has anyone else here experienced such a huge change in AFMA that wasn't caused by some other event such as dropping a body or lens?