Search found 18188 matches

by rjlittlefield
Thu May 06, 2021 9:44 pm
Forum: Photography Through the Microscope
Topic: Crystals - nasal mucus
Replies: 4
Views: 76

Re: Crystals - nasal mucus

The gold and maroon one could be worked up into a very nice upholstery fabric!

No one would ever need to know what pattern they were sitting on...

--Rik
by rjlittlefield
Thu May 06, 2021 11:48 am
Forum: Nature Photography -- Macro and Close-up
Topic: Ants: sticking the kids in the nursery
Replies: 4
Views: 64

Re: Ants: sticking the kids in the nursery

Nice shot & montage! These look like nearly mature larvae, not pupae. Except for the few that spin cocoons, ant pupae look more like adult ants except they're cream-colored and have all their limbs tucked in. The adults may have figured it was easier to bring larvae to the food, than food to the lar...
by rjlittlefield
Thu May 06, 2021 9:01 am
Forum: Equipment Discussions
Topic: Parallel sensor alignment / digital spirit levels
Replies: 11
Views: 376

Re: Parallel sensor alignment / digital spirit levels

You could easily build your own super precise leve l. :D That's a very clever device: butane with bubble in a glass tube that is bent slightly by pressure from a couple of adjusting screws. As shown in the video, the builder gets bubble movement of about 2.5 cm for an inclination of about 1 part in...
by rjlittlefield
Tue May 04, 2021 6:47 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Haze?
Replies: 22
Views: 339

Re: Haze?

the second result does not show focus gaps. I am not sure about this, it is hard to tell with the lower resolution image, but I think I might still be able to see the band I highlighted? I am really not sure though. The flash-between is pretty compelling. With my browser, a quick-and-dirty way to s...
by rjlittlefield
Tue May 04, 2021 5:59 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Haze?
Replies: 22
Views: 339

Re: Haze?

Hhmm. Yes, that looks pretty foolproof. So then, a good step in understanding any problem is to reproduce it so that it can be debugged. Have you tried reproducing the problem shown in the first image? If you can reproduce that image with the fuzzy bands, using the same images that went into the sec...
by rjlittlefield
Tue May 04, 2021 3:51 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Haze?
Replies: 22
Views: 339

Re: Haze?

Perhaps I have misunderstood, but... My understanding is that your first and second stacked results (https://www.photomacrography.net/forum/download/file.php?id=3754 and https://www.photomacrography.net/forum/download/file.php?id=3755) used source images from the same acquisition. That is, you shot ...
by rjlittlefield
Tue May 04, 2021 10:37 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Haze?
Replies: 22
Views: 339

Re: Haze?

I'm struggling to figure out how to provide the best help. You started this thread by writing In the below image (unused coffee grounds), I notice some haze in the upper portion. Any clues on the cause? The cause of that problem is now clear: you accidentally omitted some source images while running...
by rjlittlefield
Tue May 04, 2021 9:43 am
Forum: Equipment Discussions
Topic: Help to choose between two Mitutoyo 20x lens
Replies: 10
Views: 210

Re: Help to choose between two Mitutoyo 20x lens

Eric, welcome aboard! Your pictures look excellent. I agree with Scarodactyl, the 20X M Plan Apo is a great objective. But even though the objective is "new", be sure to test it immediately when you receive it. All the Mitutoyo M Plan Apos are easily knocked out of alignment internally by being drop...
by rjlittlefield
Mon May 03, 2021 8:33 pm
Forum: Equipment Discussions
Topic: Musou Black Flock Sheet
Replies: 16
Views: 377

Re: Musou Black Flock Sheet

Thanks, very interesting.

--Rik
by rjlittlefield
Mon May 03, 2021 7:37 pm
Forum: Equipment Discussions
Topic: Musou Black Flock Sheet
Replies: 16
Views: 377

Re: Musou Black Flock Sheet

Based on the earlier post from Rik, I don't think either of these materials is the same as it was back then. That's easy to believe, especially given the 8+ years since my test . Your shots appear to be perpendicular to the sheet. What happens if you test for reflection at shallow angles, typical f...
by rjlittlefield
Mon May 03, 2021 7:01 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Haze?
Replies: 22
Views: 339

Re: Haze?

I reran the stack Thank you for the second image. I loaded both images into Photoshop, made them into a layered pair, and did the flash-to-compare trick. Fortunately the two images have the same alignment, so it's very easy to see places where sharpness changes. It's clear from the flashing compari...
by rjlittlefield
Mon May 03, 2021 3:04 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Haze?
Replies: 22
Views: 339

Re: Haze?

PMax is relentless about preserving focused detail, so the intermittently-blurred appearance of that bright fiber is very odd. My best guess is that the bright fiber was moving around somehow, although exactly how, I'm having trouble imagining. In any case, the solution to this puzzle will be found ...
by rjlittlefield
Sun May 02, 2021 10:37 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Turkestan cockroach (Shelfordella Lateralis) and surprise
Replies: 7
Views: 195

Re: Turkestan cockroach (Shelfordella Lateralis) and surprise

Lovely image! Background with gradient, illumination, and posing all perfect. I do not see any stacking artifacts. The second image appears to be the shed skin of some insect that has "incomplete metamorphosis", where the young look much like the adults. (See https://en.wikipedia.org/wiki/Hemimetabo...
by rjlittlefield
Sat May 01, 2021 9:49 am
Forum: Administrator's Appreciation Gallery...Photography Through the Microscope
Topic: Caffeine crystals (by seta666)
Replies: 0
Views: 72

Caffeine crystals (by seta666)

The following image represents the winning thread for the May 2021 award for Micro. It was originally posted at https://www.photomacrography.net/forum/viewtopic.php?t=43215 (image #2 of that thread). We're reproducing the image here, separately, as part of our procedure to provide clarity when the f...
by rjlittlefield
Sat May 01, 2021 9:38 am
Forum: Photography Through the Microscope
Topic: Administrators Appreciation Award Winners for May 2021
Replies: 0
Views: 29

Administrators Appreciation Award Winners for May 2021

We are pleased to announce this month's winners of the Administrators Appreciation Awards! :D In the Photomacrography Forums, we honor David Kelly (micro_pix) for his Ixodes tick mouthparts, the image at https://www.photomacrography.net/forum/viewtopic.php?t=43409 . In the Photomicrography Forum, we...