Been playing around with the microadjust on my 7D and looking at the various charts that you can get online. Some you need to use at a 45 degree angle, whereas other say not to do this you must use a chart at the same focal plane as the lens. Then there are other that say, dont mess with microadjust at all just accept your lenses as they are.
Now I am not saying that there is anything wrong with my lenses, but I am pretty anal when it comes to my kit and I would just like to know that if I get a soft image, that its my incompetence rather then my equipment
So from what I have read I am thinking that the best way to microadjust is using some sort of chart in the same focal plane as the lens, at a distance of 50x the focal length. This can be done at the wide and long ends of a zoom lens but the MA might be different for each. It is usual to set it correct for the long end.
Take 3 shots on a tripod using a remote and mirror lockup at 0MA +5MA and -5MA, compare the images on a PC screen and see which is sharpest, from this deduce what the correct MA for your lens is.
Have I got anything wrong here, also when it comes to 50x the focal length do I also need to multiply this by 1.6 because of thre crop sensor.
Also at what point do you say, thats too much adjustment and decide that the lens needs calibrating. My lenses are less than 1 year old and if this is the case I would obviously want it done wthin warranty.