The dragon fly is exquisite Mark! -----Original Message----- >From: Mark C <[email protected]> >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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