Anybody know how 2 calculate the ratio if i use extension tubes?
now i have a 13mm, 21mm, 31mm no autofocus set, & another 25mm kenko autofocus.
problem is i dunno what magnification if i combine all to use together...
den the most funny thing i tried is using with a 28-75, totally cannot use... wonder why... with all together, i can still focus with a 75-300 at 75mm range.
the cam i using is Dynax 7D, so is the 1.5crop a factor for the magnification as well?