My main mode is short, but on rare occasions, longer glass is handy. Curious what folks are using to reach into the 300mm (and beyond range). Default 300mm for me would tend to be an adapted lens, with my default (given a Zeiss predeliction) a Zeiss 300mm/F4 in Contax CY mount. Price is right. But I'm curious what others are doing. I hear Canon has some pretty great legacy glass. Many others as well. Also curious whether anyone out there has done the "rent only" thing with longer glass?