TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] 20 minutes of your life you'll never get back...

Subject: Re: [OM] 20 minutes of your life you'll never get back...
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Tue, 6 Aug 2019 22:19:23 +0000 (UTC)
Cc: usher99@xxxxxxx
<<<<I used to be a skeptic. "How can 'adding glass' make things any better?"

Look at the white paper by Brain Caldwell.  The MTF clearly does improve with a 
good focal reducer and I believe  many of  the rendering qualities are intact.. 
 Now the Speedboosters he designed are top notch.  Thr other benefit for MFT is 
that the Speedbooster  FULLY corrects for the thickness of the sensor stack 
which remains an issue mounting some WA OM lenses on FF backs like Sonnie.   
Too bad a 0.5 focal reducer is just not practical/reasonable or possible 
according to BC--at least with sufficient quality to pass his inspection.     I 
am less interested if the true FOV can not be restored and the MFT Speedbooster 
can not be easily mounted on all OM lenses.  

TC's really do magnify all the aberrations--I member putting one on the OMZ 
50/3.5 with horrid results.  Some lenses just don't like them.  "Matched 
optics" has always been important and the 
Tamron 1.4 TC on the Tammy 80-200 always has worked well.  Now with all the 
aspheric elements a TC may only be good for one lens. 


https://www.metabones.com/assets/a/stories/Speed%20Booster%20White%20Paper.pdf


Addition can be a plus, Mike




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