learn to judge the angle of view for the lenses you carry, know how many fingers at arms length equals 200, 300, 400 mm, this will help you judge how much stalking you will need to do to get a well framed shot. I hate setting up the tripod, changing to the long lens, and then finding out I want to get closer or that I need to change lenses again quickly before some critter gets nervous. framing is one skill, but being sneaky in brush with extended tripod legs and a big reflective peice of glass is another.


