Ichneumonid (I think) wasp, found nearly died in my bathroom
This is a test shot whith a nikon CF Plan 10X infinity microscope objective, focused whith a tele lens Olympus 200mm f4. Canon 20D
(see http://www.photomacrography.net/forum/v ... sc&start=0 for details about this kind of setup)
Stack of 90 images whith Zerene PMax
50% crop to see resolution
100% crop of a single frame. The longitudinal crhomatic aberration is very high
My findings:
- resolution, working distance and easy to use are very good
- Lateral CA is present, but only in the borders (not visible in this images)
- Longitudinal CA is very high
- Zerene Pmax did an admirable job, not only giving a near artifact free image but also removing efectively almost all longitudinal CA
Rick, please move it to Equipement discussions if adequate.
Any comments and advice wellcome
wasp eye at 10X
Moderators: rjlittlefield, ChrisR, Chris S., Pau
wasp eye at 10X
Pau
Great to see more images with this approach so thanks for posting Pau! I like the dreamy feel in the first image – nicely chosen depth of the stack with an unusually pleasant transition from sharp to blurry!
I have to confess that when I saw the last image I just thought "ouch, that's a lot of LoCA" but reading Thunder's comment made me reconsider and agree – it's really quite beautiful! Good to have an art major on the board!
I have to confess that when I saw the last image I just thought "ouch, that's a lot of LoCA" but reading Thunder's comment made me reconsider and agree – it's really quite beautiful! Good to have an art major on the board!
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Re: wasp eye at 10X
Longitudinal/axial CA is indeed very high and the secondary spectrum is the classic magenta in front / emerald green behind of an achromatic lens.Pau wrote: - Longitudinal CA is very high
- Zerene Pmax did an admirable job, not only giving a near artifact free image but also removing efectively almost all longitudinal CA
I guess the objective does not claim to be apochromatic (and not all lenses which do claim it are, in fact, apochromatic).
Since axial CA is an artifact of OOF areas, I guess it should not be too surprising that stacking removes it (but the extent to which it does so was indeed a surprise, to me at least).
- Joaquim F.
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- Contact:
An excellent first contact!
It's the same lens that I'm using, some specs here:
http://www.capraoptical.com/products/ni ... cfepi.html
In the Nikkor 200 / 4 AI are also those magenta-green CAs , but that objective have that tendency in normal photography too, the Olympus behaves similarly?
Try close the Olympus to f/5.6, even at f/8 if the distance between the optics is very short, in my setup seems to decrease in some degree the CAs and general "flare" too.
I fully agree with your analysis.
Best regards (saludos)
Joaquim
It's the same lens that I'm using, some specs here:
http://www.capraoptical.com/products/ni ... cfepi.html
In the Nikkor 200 / 4 AI are also those magenta-green CAs , but that objective have that tendency in normal photography too, the Olympus behaves similarly?
Try close the Olympus to f/5.6, even at f/8 if the distance between the optics is very short, in my setup seems to decrease in some degree the CAs and general "flare" too.
I fully agree with your analysis.
Best regards (saludos)
Joaquim
Thanks all for your comments.
Good point!, but it's already at 100%, it will be a very little onethat last one would make a nice poster.
I agree, it's a plan achromat, but the amount of LoCA is the higher I never see. Other stacking aproaches, like Zerene DMap or Combine ZP did not remove it at the same extent.I guess the objective does not claim to be apochromatic (and not all lenses which do claim it are, in fact, apochromatic).
Since axial CA is an artifact of OOF areas, I guess it should not be too surprising that stacking removes it (but the extent to which it does so was indeed a surprise, to me at least).
I will try it later, and also whith my zoom as tube lens (70-200 f4L usm IS), Rick has tried it with a cheaper one whith excellent results.In the Nikkor 200 / 4 AI are also those magenta-green CAs , but that objective have that tendency in normal photography too, the Olympus behaves similarly?
Try close the Olympus to f/5.6, even at f/8 if the distance between the optics is very short, in my setup seems to decrease in some degree the CAs and general "flare" too.
Pau