Hi Fernando and all,
Back from lurk mode, in these days of surprisingly busy summer...
Fernando wrote:
>The bokeh seems odd to me: donuts appear in the OOF background as
>if it was a catadioptric tele.
>Of course, noone at the Flickr group noticed ...
>
>Do you find this somehow odd (or is it just me?) - if so, how can
>this be explained?
<http://www.flickr.com/photos/jikatu/5918710077/in/contacts/lightbox/><http://www.flickr.com/photos/jikatu/5918710077/in/contacts/lightbox/>
I think it's an unhappy combination of things... first, it's not unusual for
a Macro lens to be somewhat 'overcorrected' on spherical aberration, leading
to ring-like backgroung highlights. And if the picture has been
over-sharpened a bit, those rings may look like in the picture you say.
In other words, if you look closely, unlike those from mirror lenses, these
donuts aren't "hollow", really ;-)
Cheers,
<http://www.flickr.com/photos/jikatu/5918710077/in/contacts/lightbox/>--
Carlos J. Santisteban Salinas
IES Turaniana (Roquetas de Mar, Almeria)
<http://cjss.sytes.net/>
--
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