I have a 600D that I use a f4.5 L series 100-400 on. If I buy a extender 1.4x ii, can I assume manual focus only? I had read that a firmware update may change that..... Thanks
Todd, Going to be in the Smokey mtns,would like to get a nite shot high on the horizon showing the shapes of mtns & star trails moving across the sky. Do you have a recommendation for a starting point for ISO,Exposure length and aperture. I have a Ve...
