Nikon 400mm f/2.8 + 1.4 TC Vs Nikon 600mm f/4 VR

Started Mar 16, 2009 | Discussions thread
sting
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Re: Optimum aperture
In reply to Marianne Oelund, Mar 21, 2009

Marianne Oelund wrote:

In ideal laboratory testing conditions, I've found optimum to be 1 to
1.5 stops down from wide open, with any TC or combination.

Thank you for writing about your testing. I've always wondered about comments to that extent and was never sure if there was an ideal amount to stop down.

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