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Re: [OM] New 90mm Zuiko macro

Subject: Re: [OM] New 90mm Zuiko macro
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Thu, 09 Feb 2023 11:09:24 -0700
At 2/9/2023 04:54 AM, Frank wrote:
>Actually, the Sigma 180mm 2.8 macro is also effective 115mm at 1:1
>If I may believe the formula I found some time ago ;-).
>I collected data from some macro lenses. They are as good as their source
>(which I don't provide ;-).
>All in here: <
>Improvements always welcome.
>Enjoy, Frank.

Thanks for the spreadsheet. I have the Canon EF 180mm F3.5 macro:

MFD 480mm (focal plane)
MWD 240mm (9.5")
from a calculator with 480mm MFD effective focal length would be 120mm?

I always get confused by the 2x MFT comparisons. Does MFD 3.7" at 1:1 compared 
to FF 180mm MFD 9.5" at 1:1"?


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