In the process of deciding on a lens to go with the 17-40 and 20D I have, and wishing to fill frame with Spitfire, or Mustang etc. Now 200mm becomes 320mm, is that going to be enough ?...no way of testing such outside a camera shop. Firstly what is minimum foc length required at a UK airshow and runway to crowd regs with aircraft in front of me, then what if aircraft off to my 10 oclock, 11 oclock angle ?
Any recomendations on affordable sharp with minimal abberations max £500 lenses suitable also welcome. I also will need to add extension tubes as require to use this lens on 3ft away subjects....so a 1.2m perhaps better than 1.8m !
Is 70-300 going to introduce a compromise in quality ?
Canons 70-200 f4 has good reviews, but the 75-300 is not so well optically and speed wise I read.
DBenz