Re: [OM] On topic, well, could be ...

[Mike Gordon via olympus]

Couple more comments.  Would not totally dismiss the newly designed Panny 
100-300 ii --very few reviews out yet.  The IS is the latest version and 
clearly better than the previous incarnation.
Comparison  of the older version with the mighty Panny Leica 100-400  here :

http://www.mirrorlessons.com/2016/03/10/panasonic-100-400mm-vs-100-300mm/


The new version has some CA and the corners at 300 are not perfect so I would 
surmise the 100-400 is better at 400 than the 100-300 is at 300 but bet it is 
fairly close.
I do like my Panny/L 100-400 and can't beat the flexibility.  The rendering of 
the Oly 300 Plus TC I think is  better under many conditions though that is an 
impression.  Doesn't make sense to get the Oly
unless it is to be used on very new Oly body. 

I am not sure about the Professor Moose's comments on the 
extender/Teleconverter (TC).  When I hear safari, I had thought it more likely 
it to be used to extend reach at distant focusing distance and not increase mag
at or near MFD.   It is also an interesting conjecture that the exit pupil 
distance to the sensor matters more for lens performance even with MFT lenses 
due to the thick sensor stack.  I have only seen the exit pupil distance 
mentioned as a known important variable when using lenses designed for 
different sensor stack thickness- what we clearly know:

1) Difference between actual stack thickness and designed stack thickness. 
(zero for film)
 2) Exit pupil distance (shorter distance gives more problems)
 3) Aperture (wider aperture gives more problems)
 4) Angle of view (wide angle gives more problems)

Putting an extension tube on a MFT lens may be fine but would anticipate some 
issues with lenses with floating elements.  Some lenses just don't behave well 
with extension and the reasons remain  mysterious to me.
I recall a few e-mail exchanges with Tamron tech many years ago--they said best 
to use the matched TC on the vaunted  Tam 80-200 to increase mag then use 
extension.  Now I have really drifted off topic even more.

Fan of Professor Moose, Mike
-- 
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