Search found 17708 matches

by rjlittlefield
Sun Aug 09, 2020 9:49 am
Forum: General Discussion Forum and Community Announcements
Topic: Dark fish
Replies: 7
Views: 232

Re: Dark fish

.... In the July 16 edition of the magazine Curent Biology .... Has anyone found this reference? There is no July 16th edition and I don't see it in the other issues of past July. I am curious why fish that live in the complete dark would like to reduce their optical visibility. The Wikipedia artic...
by rjlittlefield
Sat Aug 08, 2020 2:15 pm
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 575

Re: Sony A7R with microscope lens

On the other hand, I can say from personal experience that the home-made solutions do not work well when placed far from the objective. That's where the purpose-built tube lenses like the ITL200 really shine. Yep, same here. I've tried my measurescope setup with a 200mm telephoto and the FF-optimis...
by rjlittlefield
Sat Aug 08, 2020 1:54 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Trippy colored landscape (new image added)
Replies: 11
Views: 237

Re: Trippy colored landscape (new image added)

Slag ? Wikipedia: "Slag is the glass-like by-product left over after a desired metal has been separated from its raw ore. " No, definitely not the left-overs from any refining or manufacturing operation. I will share that this subject is a tiny part of the surface of a manufactured object that is n...
by rjlittlefield
Sat Aug 08, 2020 1:53 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Trippy colored landscape (new image added)
Replies: 11
Views: 237

Re: Trippy colored landscape (new image added)

but the stereo relief is extremely nice. Thanks. I confess, this last rendition required quite a bit of retouching (in Photoshop) to eliminate spurious stereo artifacts, which in turn were caused by stacking artifacts. Maybe I'll make a separate technical thread about that process. Very briefly, it...
by rjlittlefield
Sat Aug 08, 2020 12:11 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Trippy colored landscape (new image added)
Replies: 11
Views: 237

Re: Trippy colored landscape (new image added)

From what I know of the process that created this subject, I expect that we're looking at some combination of metal compounds, possibly in different crystalline states. I expect that some of the colors are structural and some are pigment, but I am less confident about the pigment aspect. There may b...
by rjlittlefield
Sat Aug 08, 2020 8:32 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Bumblebee mandible with golden hairs
Replies: 3
Views: 233

Re: Bumblebee mandible with golden hairs

Thanks, Dassi. Yes, detail is a strong part of what attracts me in this field. When I started doing macro photography, over 50 years ago, I dreamed of making pictures like these but had no idea how to do it. Then I learned about the physical limits imposed by diffraction, and I feared that the task...
by rjlittlefield
Fri Aug 07, 2020 5:38 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Trippy colored landscape (new image added)
Replies: 11
Views: 237

Re: Trippy colored landscape (new image added)

Yes, I'm quite sure the colors are related to heat, though exactly how is a mystery in some areas.

BTW, this subject has at least two different relations to heat!

--Rik
by rjlittlefield
Fri Aug 07, 2020 5:10 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Trippy colored landscape (new image added)
Replies: 11
Views: 237

Re: Trippy colored landscape

Welding surface ? Ah, it does look like that! But no welding tools were near this object. Besides, this thing is small . The earlier images were pretty tight crops from 10.4X on fullframe (Mitutoyo 10X NA 0.28 with Raynox DCR-150 on Nikon D800E, 7 micron focus step). Here's a new stack, shot with 5...
by rjlittlefield
Thu Aug 06, 2020 3:38 pm
Forum: Photography Through the Microscope
Topic: Two days of pain
Replies: 13
Views: 194

Re: Two days of pain

The new link works great. I maximized the image, saved it to .jpg file, and pulled it into StereoPhoto Maker so I could zoom in. That gives a simply wonderful view of both the translucency and sharpness of those crystals front and center. If this were my image, I would not be able to resist posting ...
by rjlittlefield
Thu Aug 06, 2020 2:33 pm
Forum: Photography Through the Microscope
Topic: Two days of pain
Replies: 13
Views: 194

Re: Two days of pain

Link to the bigger stereo seems to be broken, Flickr gives a "404 // This is not the page you’re looking for".

--Rik
by rjlittlefield
Thu Aug 06, 2020 10:49 am
Forum: Photography Through the Microscope
Topic: Two days of pain
Replies: 13
Views: 194

Re: Two days of pain

This image is lovely, but the subject keeps reminding me of some Pacific islander's weapon made of shark teeth.

--Rik
by rjlittlefield
Thu Aug 06, 2020 8:19 am
Forum: Equipment Discussions
Topic: Sony A7R with microscope lens
Replies: 29
Views: 575

Re: Sony A7R with microscope lens

Higher NA brings stacking errors or something, I've never studied this. Only recently I've been encountering such problems. A sunset moth stack turned the lines in the scales into little zig zags. This looks like a common effect that I've come to describe as "features squirming around laterally as ...
by rjlittlefield
Wed Aug 05, 2020 9:37 pm
Forum: Equipment Discussions
Topic: Nikon Plan 10X (inf) and Raynox M-150
Replies: 4
Views: 118

Re: Nikon Plan 10X (inf) and Raynox M-150

The Nikon MRL00102 (gold barrel, CFI-60 series, like at https://www.photomacrography.net/forum/viewtopic.php?p=265587#p265587 ) covers about 5 mm diameter on subject, so about 50mm diagonal on sensor at 10X. It works great on APS-C at 5X, on 100 mm tube lens, which is 5.6 mm diameter on subject. The...
by rjlittlefield
Wed Aug 05, 2020 8:10 pm
Forum: Equipment Discussions
Topic: Nikon Plan 10X (inf) and Raynox M-150
Replies: 4
Views: 118

Re: Nikon Plan 10X (inf) and Raynox M-150

Welcome aboard! The web tells me that Raynox M-150 is a synonym for Raynox DCR-150, which is what it's usually called in this forum. The simplest method is to buy a tube-and-rail set from either WeMacro (https://www.wemacro.com/?product=raynox-dcr-150-tube-lens-pro) or mjkzz (https://www.mjkzz.com/p...
by rjlittlefield
Wed Aug 05, 2020 5:30 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Trippy colored landscape (new image added)
Replies: 11
Views: 237

Trippy colored landscape (new image added)

I was surprised to find these vibrant colors and interesting shapes on an apparently mundane and rather annoying object. Of course I'll tell you all about it later, but for the moment let's make it a "puzzle piece". Any guesses about what this is? Crossed eye stereo pairs, of course. 2020-08-05-15.5...