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Re: [OM] Various lens sharpness numbers at various apertures

Subject: Re: [OM] Various lens sharpness numbers at various apertures
From: "Rand E. Tomcala" <rtomcala@xxxxxxxxxxx>
Date: Sun, 10 Jan 1999 17:36:29 -0500
You can borrow my 200mm f4 on one condition, I would like my Tamron 90mm
f2.5 tested (with and without Tamron SP 2x converter-which I will
supply).  What kind of time frame are we talking?  Are there other
lens/combinations that your interested in ?  How about other types of
converters ? Like my (have 2) Vivitar Macro 2x converter ?
  Are we drooling at some of these possibilities ?  I am !
Rand E.

P.S.  You can borrow the 200mm f4 without the condition too.  OBTW, is a
SC lens.
  Would you like a lens inventory?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PCACala@xxxxxxx wrote:
> 
> Dave Bulger writes:
> 
> > This is gonna bug me until I know exactly what aperture each of
> >  my lenses is sharpest at.
> 
> Well, my next round of testing will likely include the following:
> 35mm f/2.8 Shift centered and at maximum horizontal offset
> 90mm f/2 Macro
> 90mm f/2 Macro with 2X teleconverter, 1.4X teleconverter and both converters
> 100-200 f/5 (with and without 2X teleconverter)
> 100mm f/2.8 w/ 2X teleconverter
> 135mm f/3.5 w/ 2X teleconverter
> 200mm f/5 w/ 2X teleconverter
> 300mm f/4.5 with 1.4X teleconverter
> 300mm f/4.5 with 2X teleconverter
> 
> ***Note to all***
> If anyone is willing to lend me their 135mm f/2.8 (SC or MC), I'd be happy to
> test it with and without the 2X.  I'd also love to borrow another person's
> 200mm f/4 to verify that mine is sick, as well as be able to test all the lens
> that the 2X was designed for - while I have the 2X on loan.  Please contact me
> offline on that.
> 
> Gary Reese
> Las Vegas, NV
> 
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