Search found 18281 matches

by rjlittlefield
Wed Jun 16, 2021 9:21 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: eyes of Western Cherry Frult Fly
Replies: 0
Views: 42

eyes of Western Cherry Frult Fly

A close crop to show the ommatidia: https://janrik.net/MiscSubj/2021/CherryFruitFlyFaces_202106/2021-06-14-16.54.53-ZS-stereo_000_crop4_small.jpg Here is a somewhat wider view, as crossed eye stereo. https://janrik.net/MiscSubj/2021/CherryFruitFlyFaces_202106/2021-06-14-16.54.53-ZS-stereo_000_crop3_...
by rjlittlefield
Wed Jun 16, 2021 5:39 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Butterfly or Moth @ 850nm
Replies: 3
Views: 72

Re: Butterfly or Moth @ 850nm

I have seen it written: " The best camera is the one you have with you. " A closer look reveals that the "pollen" is an anatomical structure? The wings are black and white in visible light, as well. That looks like an Eight-spotted Forester moth. The stuff that looks like pollen is a brush of colorf...
by rjlittlefield
Wed Jun 16, 2021 5:23 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Not caterpillars. Wasps!
Replies: 2
Views: 70

Re: Not caterpillars. Wasps!

Nice find, nice image!

Judging from the circular "hatches" surrounded by rings of small pegs, I'm guessing the normal hatchlings would have been hemiptera nymphs, not caterpillars.

--Rik
by rjlittlefield
Wed Jun 16, 2021 3:28 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Special slide + reconstruction algorithm = super resolution microscopy
Replies: 10
Views: 472

Re: Special slide + reconstruction algorithm = super resolution microscopy

If I follow -- but only vaguely - the layered material reminds me of how structural colors are made, such as the metallic colors you see on some insects. White light goes in, gets bounced around in a labyrinthine structure, and the reflected colors that are come out mainly a specific wavelength (of...
by rjlittlefield
Wed Jun 16, 2021 7:49 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Minerals in 3D (stereopairs)
Replies: 4
Views: 123

Re: Minerals in 3D (stereopairs)

Well, it is a win-win. I am very fond of stereo, and fond of photos of small things, and that synthetic stereo method has greatly increased the number of excellent images I get to look at.

So, thank you for your side of this fine collaboration!

--Rik
by rjlittlefield
Tue Jun 15, 2021 3:55 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Zerene Stacker Help
Replies: 5
Views: 152

Re: Zerene Stacker Help

Excellent! Thanks for jumping on the firmware update, and for updating the status here. I'm very happy to have the count of troublesome computers be back down to zero. :)

--Rik
by rjlittlefield
Tue Jun 15, 2021 2:21 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Mayfly molting from subimago to adult
Replies: 11
Views: 213

Re: Mayfly molting from subimago to adult

There's another perhaps surprising detail of the molting process that might go unnoticed, but shows clearly in these pictures if you know what to look for. The surprising detail is that it's not just the outer skin that gets shed; the linings of the larger tracheal tubes also get pulled out. As expl...
by rjlittlefield
Tue Jun 15, 2021 8:39 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Mayfly molting from subimago to adult
Replies: 11
Views: 213

Re: Mayfly molting from subimago to adult

Thanks for all the comments and info, guys! iconoclastica, as far as I know all the major appendages are formed inside corresponding parts of the old skin. Smaller features like bristles are formed totally new; see for example https://www.photomacrography.net/forum/viewtopic.php?t=37664 (moth) and h...
by rjlittlefield
Mon Jun 14, 2021 8:15 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: mountain swallowtail
Replies: 33
Views: 7020

Re: mountain swallowtail

At 50X NA 0.55, you're running at effective aperture f/45 (=50/(2*0.55)). Even for extreme blue wavelength 400 nm, that still puts the diffraction cutoff frequency at 18.2 microns per cycle. Against that, your camera has a sensor that is 3.2 microns per pixel. It will be 25x NA 0.55, because of the...
by rjlittlefield
Mon Jun 14, 2021 8:11 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Minerals in 3D (stereopairs)
Replies: 4
Views: 123

Re: Minerals in 3D (stereopairs)

This is superb! I exercised the side-by-side displays, both crossed-eye and using a parallel viewer, with lots of zooming in to see details. I saw no discernable delays at any point in zooming and panning, using Chrome browser. It probably helps that my internet connection has lots of bandwidth and ...
by rjlittlefield
Sun Jun 13, 2021 10:20 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Zerene Stacker Help
Replies: 5
Views: 152

Re: Zerene Stacker Help

Alex, hello and welcome to the forum! I'm Rik Littlefield, the fellow who wrote Zerene Stacker and answers all the emails to support@zerenesystems.com . The problem you're experiencing is so bizarre that I've never seen it before. From what I can see in your screen capture, the things that are getti...
by rjlittlefield
Sun Jun 13, 2021 10:11 pm
Forum: General Discussion Forum and Community Announcements
Topic: Forum now provides searching by word sequences
Replies: 3
Views: 52

Re: Forum now provides searching by word sequences

Thanks for the kind words. It does seem like a good change, fairly painless so far. There is still a limit on word length. Only words that are 4 characters or longer can be searched for. I'm still exploring whether we can reduce that. The limit is set as a server-wide parameter in the MySQL configur...
by rjlittlefield
Sun Jun 13, 2021 6:12 pm
Forum: General Discussion Forum and Community Announcements
Topic: Forum now provides searching by word sequences
Replies: 3
Views: 52

Forum now provides searching by word sequences

When using the forum's built-in search facility, it is now possible to specify word sequences by enclosing them in quotes. For example, a search for posts by rjlittlefield, containing diffraction blurring without the quotes, returns 75 replies after this post, but only 52 when quotes are added as in...
by rjlittlefield
Sun Jun 13, 2021 3:34 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Crane fly
Replies: 2
Views: 87

Re: Crane fly

Crane fly (Diptera:Tipulidae), very nice. Despite that I now expect them, I'm still always surprised to see those bright green eyes on a fly that is otherwise drab. The green seems to be a specular reflection off the very surface of the eye. The color changes to copper at some angles. See for exampl...
by rjlittlefield
Sun Jun 13, 2021 1:45 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Scorpion fly male - Panorpa communis
Replies: 11
Views: 166

Re: Scorpion fly male - Panorpa communis

RAW looks quite poor before developing For deep stacks I usually shoot JPEG, just to avoid the extra trouble of raw processing. With good flocking & masking, I have no trouble with low contrast. I suspect you're getting veiling glare due to reflections from the sides of your Raynox lens or extensio...