[OM] Re: #084

[Chuck Norcutt]

I wonder if it was taken with the 70-300mm f/4.5-5.6 DO IS lens.  The 
"DO" is "diffractive optics" and looks like an element with concentric 
rings on it.  From some shots I saw these rings tend to replicate 
themselves in the bokeh.  Truly ugly.  Worse than a mirror lens.

Chuck Norcutt

Jeff Keller wrote:
> 
> I recently was looking through some pictures taken by a 5D with most likely 
> C*non glass. The out of focus circles had a very sharp circumference with 
> the center often noticeably darker than the outer part of the circle. It was 
> almost as distracting as the catadioptric lenses. With the full size image I 
> would have thought the photographer would have less problem with bokeh 
> (compared to a user switching from OM to E-System). Hopefully I'll get a 
> chance to talk with the photographer if he doesn't quickly get burned out 
> taking real estate pictures.
> 
> -jeff



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