Warren Kato wrote:
> I had both of these at the same time for a couple of months and ran
> cursory tests of both. At f8 they are both much the same.  At f 5.6
> the 6x7 version drops noticeably in resolution and wide open at f4 the
> resolution is 50% (subjectively) of the 645 version.  In comparison to
> itself, the 645 version only seems to lose about 10% sharpness wide
> open.  It is a remarkable lens that, wide open, is sharp and contrasty
> corner to corner with no vignetting.  At the prices you can get the
> 300/4 ED for now, there is no question as to which of the two you
> should get.  (I assume you are not talking about the 6x7 300/4 ED
> lens, which I have heard is a very good lens but have no personal
> experience with.)
> 
> Warren
> 
Thanks, Warren.  That's exactly what I'm looking for.  Much appreciated.

-- 
Scott Loveless
http://www.twosixteen.com/fivetoedsloth/

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