100-300 or 75-300?

Bob Greenberg wrote:

I use the em5 and 100-300, its quite good on larger or static birds but hunts too much for bif. I also usw the Panny 35-100 which is a beautiful lens, focuses more accurately, but of course is shorter. Can't wait for someone to come out with a high quality longer lens, perhaps since Oly discontinued the 75-300 the replacement will be good!

Bird Nerd