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Canon DSLR Challenge | all galleries >> Challenge 26: Wide aperture (Hosted by Anna Yu) >> Challenge 26: Eligible (Hosted by Anna Yu) > Ta Da!* by Jonathan Nissanov
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10/15/04 Jonathan Nissanov

Ta Da!* by Jonathan Nissanov

Photo sandwich @ 2.8. Polystachya aconitiflora, a minature African orchid.


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Victor Engel18-Oct-2004 04:35
My first attempt at a sandwich. Is it, in fact a sandwich? I perhaps went a little overboard. Please comment there so as not to clutter up this board.
http://www.pbase.com/image/35196730
-- Victor
Victor Engel18-Oct-2004 02:47
OK. I thought the 3D situation was just a special case of a sandwich. Are you saying that's part of what defines it? -- Victor
Canon DSLR Challenge18-Oct-2004 02:44
No. Not the same at all. In the case of sandwich you are filtering in 3D. Its also nonnormal (exact function depends on the point-spread-function of your lens at the aperature employed). Try both approaches on something like patterned cloth folded to form sinusoidal waves in z-axis (parallel to the optical axis).
Canon DSLR Challenge18-Oct-2004 02:06
Your description sounds somewhat like what I do to get a soft focus look: gaussian blur followed immediately by a fade, the main difference being that using fade, the image remains in a single layer. I think I'll have to experiment with the combination of different focus points. Thanks for the explanation. -- Victor
Canon DSLR Challenge17-Oct-2004 23:28
Traditional sandwiches consists of 2 photos-one in focus the other out-of-focus. When you add the two you get a glow whose intensity depends on how out-of-focus the second image is (with slides you underexpose both and then mount them together) . With PS one can take this much futher. An example that is based on this traditional approach can be seen athttp://www.pbase.com/yonili/image/32556450 where I differentially manipulated each layer and then merged. Instead of adding the two, one can do other type of merger. For the entry in this challenge, I did an exclusion. What's more, here both images (each shot at f2.8) were in focus but the plane of focus was shifted by 1mm or so relative to each other (this is shot at maybe 1.5x so very narrow DOF). This results in a slight color shift where one is slightly out-focus while the other is in focus. This appears here as small droplet like structures on the top of the flower. There is also a slight glow in the depth of the flower and on the leaflets due to the manipulation. Areas that are completely beyond the DOF on both are unaffected. Clearly this type of manipulation is not meant to yield accurate representational photography. While the human-like shy emergence of the flower was visible in the original images (I arranged the stems to enhance that sense), the manipulation IMO adds a touch of mystery.
Canon DSLR Challenge17-Oct-2004 20:08
Can you explain what you mean by photo sandwich? -- Victor
Canon DSLR Challenge17-Oct-2004 18:00
Right, Polystachya. A member of my lab is an avid orchid collector and he has been kindly lending me plants over the weekends for photo shoots.
Victor Engel17-Oct-2004 08:35
I'm not familiar with this particular species, but I am familiar with the genus. It's Polystachya, not Apolystachya. -- Victor
Anna Yu17-Oct-2004 05:17
The orchid just peeping out from behind the stems gives it an almost human quality. On of the best orchid shots I've ever seen.