Search found 200 matches

by Bob-O-Rama
Wed Jan 10, 2024 12:43 pm
Forum: Equipment Discussions
Topic: Help! Macro rail minimum 1µm step size is too big.
Replies: 34
Views: 3820

Re: Help! Macro rail minimum 1µm step size is too big.

Oops! After putting the Nikon 50x/0.8 onto my WeMacro macro rail setup, I find the minimum 1µm step size isn't short enough in certain cases. I can't tell if this is a current issue for you or not, but FWIW the recent WeMacro for Android lets you specify 0.3 micron steps. I have been using this for...
by Bob-O-Rama
Tue Dec 26, 2023 8:19 am
Forum: Equipment Discussions
Topic: High-end Line Scan Lens vs High-end HR Objectives
Replies: 17
Views: 2177

Re: High-end Line Scan Lens vs High-end HR Objectives

What kind of non-linescan camera could even take advantage of it? Hassy, Fuji, or Pentax digital medium format have images circles of about 80mm, so that would be a good match. The issue is resolution, the lens would likely "out resolve" the sensor on these cameras. The Fiji also offers a multi-sho...
by Bob-O-Rama
Tue Dec 26, 2023 7:48 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Increasing length from sensor without increasing magnification
Replies: 1
Views: 2290

Re: Increasing length from sensor without increasing magnification

I guess I'm not understanding the issue, or perhaps your setup. With MFT the flange distance is 19.25mm. I don't know the specifics of the lenses you are using, but many of the (flatbed scanner, I assume?) lenses will have a pretty long distance to the sensor when used at the intended magnification....
by Bob-O-Rama
Fri Dec 15, 2023 3:14 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Debunking the high NA / coverslip correction myth
Replies: 73
Views: 31824

Re: Debunking the high NA / coverslip correction myth

"I believe!" The Nikon 20x / NA=0.75 I use routinely is designed for cover slips and the lack of the cover slip is fairly well compensated for by changing the focus on Infinity Photo-Optical Distamax used as a tube lens. I went through a calibration process to find the ideal position for the focuser...
by Bob-O-Rama
Mon Dec 04, 2023 12:48 pm
Forum: Photography Through the Microscope
Topic: Microplastic found on M&M Candy
Replies: 3
Views: 2567

Re: Microplastic found on M&M Candy

There are three facts not in evidence: (1) that it is plastic, (2) that it came with the product, (3) that whatever it it is unsafe . M&M will send in their goon squad of lawyers if you post accusations like that. LOL. That big M&M seems nice, but I'd image he is a bruiser. "Lets science, shall we?"...
by Bob-O-Rama
Wed Nov 29, 2023 1:37 pm
Forum: Equipment Discussions
Topic: CultureHustle Black 4.0
Replies: 2
Views: 2331

Re: CultureHustle Black 4.0

I have used Black 2.0 and 3.0 for this purpose and also for making black backgrounds / stages, its pretty amazing and does not seem to shed sharticles. Applying per directions and using a couple coats gives good results. I make a lot of paper light baffles for custom optics and use it there as well....
by Bob-O-Rama
Wed Nov 29, 2023 9:29 am
Forum: Nature Photography -- Macro and Close-up
Topic: White Shouldered House Moth
Replies: 2
Views: 2340

Re: White Shouldered House Moth

If moths were as large as house cats, they would probably make pretty good pets. It would also make the photography easier. Where is CRISPR when you need it?
by Bob-O-Rama
Wed Nov 29, 2023 9:21 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Problem. "Fake rotation" of the object, with my Mitutoyo10x
Replies: 10
Views: 4872

Re: Problem. "Fake rotation" of the object, with my Mitutoyo10x

Its hard to tell, but sorta looks like an inversion of perspective as would happen in a hypercentric lens. But otherwise, yeah, this is the sort of counter intuitive stuff you see with 3D subjects.
by Bob-O-Rama
Tue Nov 28, 2023 2:29 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: water soluble fluorescent dye
Replies: 6
Views: 3140

Re: water soluble fluorescent dye

Hi,

Sodium fluorescein, rhodamine B, auromaine O all would "work" - but a lot depends on how they bind to the plant tissues that will determine if they make it into leaves or flower petals. These would cover a range of colors.
by Bob-O-Rama
Tue Nov 28, 2023 10:54 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: In Search Of: Difficult / unstitchable tiles and projects
Replies: 0
Views: 6184

In Search Of: Difficult / unstitchable tiles and projects

As a followup to the Hugin cpfind alternative I've written, I could use some assistance with test images / projects. Three ways to help: Just the Hugin / panotools project ( .pto ) file: Preferably a version just after you did control point detection, and prior to your manual cleanup. This would not...
by Bob-O-Rama
Tue Nov 21, 2023 9:37 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Saponite
Replies: 3
Views: 2672

Re: Saponite

Is it common for saponite to produce fine needles like that? They must be extremely fragile.
by Bob-O-Rama
Tue Nov 21, 2023 9:25 am
Forum: Photography Through the Microscope
Topic: Russian diatoms (deposit location name updated)
Replies: 5
Views: 2640

Re: Russian diatoms (deposit location name updated)

Always amazing. That one on the bottom row is giving "baby elephant" vibes.
by Bob-O-Rama
Tue Nov 21, 2023 9:16 am
Forum: Nature Photography -- Macro and Close-up
Topic: Guérinite
Replies: 8
Views: 3190

Re: Guérinite

That's a nice photo of a nice sample. Especially in terms of controlling the specular highlights. As for the "spruce goose" rig? No need to apologize for DIY projects that work.
by Bob-O-Rama
Mon Nov 20, 2023 12:37 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: A Hugin cpfind alternative / project cleanup tool for tiling
Replies: 1
Views: 1674

A Hugin cpfind alternative / project cleanup tool for tiling

Hi, This is going to be a saga length blabby post so apologies in advance. Also, to forestall the "But Bob, many other stitching tools do a way better job..." etc. Yes, I am aware. "Thank you, noted!" LOL Now let me now tell you about how I reinvented the wheel... Lets confront the enemy, repeated f...