
Lens is a Mitutoyo 100x/0.70 objective I'm testing for another forum member. Quite a good specimen.
(APS-C Nikon D7100 camera, halogen light, 97 shots at 0.5 micron increment, Zerene Stacker PMax.)
Edit to add stereo:
--Chris S.
Moderators: Pau, rjlittlefield, ChrisR, Chris S.
I agree, Pau. With this subject and lens, downsizing to forum resolution sacrificed little. I might even suggest that downsizing this image to forum resolution made it more pleasing to the eye: The additional information acquired by the larger NA was retained, while reduction of subjective "crispness," due to the lens' higher magnification spreading information over a larger area, was reduced.
This group of butterflies uses a slightly different mechanism than the classic multi-layer interference that causes blue in morphos. Each "dimple" is a photonic structure. Here is a technical article about the dimples. P. ulysses is a particularly simple example. Some other Papilio species produce green light by added complexity that reflects yellow along with the blue.In an offline conversation with Rik, he posited that this likely indicates that these scales contain photonic crystals; in my brief reading since, about photonic crystals, I think Rik is correct.
Unfortunately the PDF is not hosted by researchgate.net. Instead their page says "To read the full-text of this research, you can request a copy directly from the authors."TY - JOUR
AU - Vukusic, Peter
AU - Sambles, Roy
AU - Lawrence, Christopher
AU - Wakely, Gavin
PY - 2001/04/01
SP - 1116
EP - 25
N2 - The wing-scale microstructures associated with two species of Papilio butterfly are described and characterized. Despite close similarities in their structures, they do not exhibit analogous optical effects. With Papilio palinurus, deep modulations in its multilayering create bicolor reflectivity with strong polarization effects, and this leads to additive color mixing in certain visual systems. In contrast to this, Papilio ulysses features shallow multilayer modulation that produces monocolor reflectivity without significant polarization effects.
T1 - Sculpted-multilayer optical effects in two species of Papilio butterfly
VL - 40
DO - 10.1364/AO.40.001116
JO - Applied optics
ER -