If you think 600mm is too short for your needs... check out this new monster... the ZEISS Apo Sonnar T* 4/1700
This monster has been around for a while. Came across it while browsing through the Dpreview website. This is although for a Hasselblad Medium Frame mount...
Read More at
http://www.dpreview.com/news/0610/06...eiss1700f4.asp
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