Rover, I would think that the increased magnification of the R3A would make it ideal for focusing a 90/2.8, wouldn't it?
EDIT - Erwin Puts says that an effective baselength of 29mm is needed to focus a 90/2.8 - just beyond the reach of the R2's 25mm EBL, but comfortably within the 37mm EBL of the R3A.
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Last edited by Huck Finn : 11-26-2004 at 14:48.