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| p.1 #1 · does any one own a sigma 300-800mm lens help reqired |
hi im having trouble with my sigmonster and it would help to quize other users of this lens,
when i use it at 800mm wide open at 5.6 it is front focusing by about 25mm please note i am using the lens at its shortest focus range of 21 ft
when i drop down to 650mm no problems
when i use it at 800mm at f8 no problen because of the extra depth of field
are all the copys of this lens so bad if used at full mag of 800mm @ 5.6
all info will be of great help before i contact sigma as the lens has already been back for a calibration and came back no diffrence.
also iv tryed to calibrate to my 1dmk3 and iv gone to + 20 and its sill front focusing by about 5mm.