As I have said before in this forum, consider a longmanual lens. Such as the FD 300mm f/2.8 L with a 2X, FD 400mm f/2.8 Lwith a 2X, FD 500mm f/4.5 bare L, Nikkor 600mm f/4 manual or the FD 800mm f/5.6 L. The FD 600mm 4.5 is not a great lens, the Nikkor (Nikon) is a better lens in this focal length. You will have to convert these lenses but because of the cost for the new stuff it will be worth your time.


I am using a Minolta 600mm f/6.3 bare and with a 2X and I love It!


Here is an example shot.


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Here is a 100% crop.


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.28.86/_5F00_MG_5F00_7774.JPG[/img]


Pretty good eh?


John.