i just got a 2nd hand pair of canon mk II 75-300 telephoto lens. the previous owner said that i could test it out for 1 week and reject if its not good.
just wanna check how to test lens out? i get the impression that u just put it to different lengths and shoot the same object at different apertures and see if the photos are sharp..
is that it?
any particular type of things i should shoot? ( eg at the sky or at night or at certain objects?
when the photos come out, what to look out for?
is it enought to shoot at say 75, 200 and 300 mm at different apertures? and just the max and min apertures and some in the middle (eg 4, 5.6, 8, 19 , 22, 27) or every single aperture?
thks very much for help