jdramirez:
My mistake, you're right. I have the 75-300, not the 70-300.
In terms of money, I have just enough to get a 5D III. So if I were to get the 5D III, I'd have to stick with the lenses that I use right now, whereas if I were to get the 7D, I'd be able to get new lenses.
This is just a hunch, but I figure that (at ISO 100) the 7D with some nice glass would be able to get better photos than a 5D III with my 75-300. However, I often shoot in dark forests, so I'm seldom able to go below ISO 800. Because I upload online, I'd probably be able to get away with ISO 25,600 on the 5D III, which would greatly increase the number of photos that I get. However, the color fringing I get from the 75-300 can be quite bad. Will this pose a real problem if I were to crop the photos taken from a 5D III?
This is a question that's somewhat unrelated, but if I did shoot in RAW, would Lightroom allow me to view all of the photos? I'm pretty new to the software, and I'm also new to RAW, so I need help with this stuff
sdsr:
I do have a photography friend that owns a 5D III. Maybe, if he's not on vacation or something, I'd be able to borrow it and take some test shots. I don't, however, have any way to test the 7D.
In practice how different are the AF systems? Is the 5D III incredibly fast, to the point that it makes the 7D's AF system look primitive? Or is it just that little bit better that allows you to get a few more frames?