ok i done a some 30 min exposures on two separate nights and on reviewing the pictures i noticed a couple of red and green dots in the same positions on each picture, are these what you call hot spots and how can i avoid them....? (im not talking about the tiny dots which are every were in the dark areas that i think is just noise from long exposures )
any help would be great..
i am using a canon 7d and 24-105mm lens for these photo's if that makes any difference to working my problem out...
thanx warhammer...........................