Re: [OM] OT: New Sonie lens 20/1.8

Subject: Re: [OM] OT: New Sonie lens 20/1.8
From: Moose <olymoose@xxxxxxxxx>
Date: Tue, 24 Mar 2020 12:06:57 -0700
On 3/24/2020 7:25 AM, Wayne Shumaker wrote:
At 3/23/2020 10:03 PM, Moose wrote:
In my 5D days, I had a 17-35 mm zoom. at San Simeon, all but four of the shots in all 
four of these sub-galleries were @ 17 mm. I wanted wider for most and REALLY wanted 
much wider for the pools. 

20 mm wasn't even all that wide in OM days, what with the 18/3.5.
Some on Fred Miranda are saying it may be closer to 19mm.

Some data from old Modern Photo reviews.

Brand    Lens    Nominal  Measured    Diff.
Zuiko    18/3.5    18      18.76    4.2%
Zuiko    21/2      21      20.15   -4.0%
Zuiko    40/2      40      41.33    3.3%
Zuiko    50/1.2    50      52.48    5.0%
Zuiko    50.1.4    50      50.94    1.9%
Zuiko    50/1.8    50      51.87    3.7%
Zuiko    90/2      90      90.44    0.5%
Zuiko    100/2    100     100.65    0.6%
Zuiko    180/2    180     180.57    0.3%

They may be referencing back to this review. Where else are they going to get 
accurate measurements?

Modern's criterion for meeting specs was ±5%, as I recall. The problem with using point data like this is that there is natural variation. Someone hoping for a 20 mm F2 might well end up with a nominal 20/2 that's actually 22 mm. Then again, they will probably never know,  be happy at how clever they were and enjoy the pictures they make with it. :-)

Perhaps as we get older, our perspective gets wider.

I don't know about your part of "we", and speaking only literally, I still 
crave both the long and the short of it all.

Perspective Moose

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