Thanks, Ken. I think that was a PESO a couple years back.
On 5/2/2016 10:29 AM, Ken Waller wrote:
The dragon fly is exquisite Mark!
-----Original Message-----
From: Mark C <pdml-m...@charter.net>
Subject: Re: OOF rendering in focus stacks
Collin -
I'm not familiar with the lenses you reference or implications for lens
design, but the sudden transition from in focus to out of focus that you
get when focus stacking can be used to manipulate the bokeh. For
example, I did not need ot stack this shot but did to put the background
of out of focus, and only stacked the images needed to get the dragonfly
in focus:
http://www.markcassino.com/b2evolution/media/blogs/calarti/2014/IMGP1396-1409_L.jpg
The abrupt transition is obvious in the blade of grass just to the left
of the dragonfly's abdomen, near the bottom of the image. With some
selective layering or cloning from one image to another that could have
been easily addressed.
A couple other samples and comments about the images and stacking
technique are here:
http://www.markcassino.com/b2evolution/index.php/stack-focused-dragonflies
Mark
On 4/29/2016 7:50 AM, Collin B wrote:
This has me curious. Can we use this technology to emulate a variety of lens
designs?
Take, for instance the old Pentax-A 70-210/4 vs the Takumar-A 70-200. The
Tak-A has a much shorter transition from in-focus to out-of-focus.
Might one also use stacking with a mirror lens to eliminate the doughnut
bokeh?
Perhaps through stacking someone might emulate the unique character of a
Petzval or a Protar. They certainly can't be done in a single layer.
Will be interesting to see what the future holds. An engineer might use
such technology with appropriate (mathematical) filters to predict lens
design behavior without ever building it. Like an optical add-in for catia.
Collin
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