Search found 4808 matches

by Pau
Thu Apr 15, 2021 11:54 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: dark-field ?
Replies: 3
Views: 186

Re: dark-field ?

:D
It's a very nice image, it seems a X ray plate
by Pau
Thu Apr 15, 2021 8:02 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: dark-field ?
Replies: 3
Views: 186

Re: dark-field ?

...or maybe inverted B+W brightfield?
:-k
by Pau
Mon Apr 12, 2021 5:00 am
Forum: Photography Through the Microscope
Topic: When is a clam not a clam?
Replies: 5
Views: 259

Re: When is a clam not a clam?

My text says the shells are composed of a low-magnesium calcite exoskeleton (carapace) with an outer covering, cuticle, of chitin. My guess is that it is the chitin that 'responds' to polarized light. Perhaps marine species lack chitin ... Calcium carbonate (both calcite and aragonite, being the la...
by Pau
Thu Apr 08, 2021 5:41 am
Forum: Equipment Discussions
Topic: Mirrorless tethered stacking?
Replies: 7
Views: 283

Re: Mirrorless tethered stacking?

Some Canon have full electronic shutter, at last the APSC M6 Mk II and the EOS R series
https://www.photomacrography.net/forum/ ... 32#p271732

Unfortunately no pixel shift for now.
by Pau
Wed Apr 07, 2021 10:41 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Veins of a leaf
Replies: 3
Views: 173

Re: Veins of a leaf

Very beautiful pictures !

Ruscus leaves actually are modified stems, not true leaves. They produce flowers and fruits in their centre
by Pau
Mon Apr 05, 2021 8:53 am
Forum: Equipment Discussions
Topic: Zeiss Photomicroscope DIC Inko questions.
Replies: 1
Views: 103

Re: Zeiss Photomicroscope DIC Inko questions.

- Yes, they are the right parts for DIC with the Zeiss PM and the adequate objectives (in principle only some Plan achromats and neofluars, although some others would work well enough) - If your Florescence equipment increases the distance from the objective to the Inko (DIC) prism yes, it will need...
by Pau
Mon Apr 05, 2021 4:15 am
Forum: Photography Through the Microscope
Topic: Springtail polarized
Replies: 10
Views: 450

Re: Springtail polarized

Yes, I believe it is a full lambda plat'; labeled 530 nm. By rotating the polarizer I can get various colour backgrounds; the setting that gives the awful purple colour also gives the best definition of the internal musculature. Yes, this are the typical full wave plate behavior and label. With 1/4...
by Pau
Sun Apr 04, 2021 10:18 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Purslane (Portulaca oleracea) seeds
Replies: 19
Views: 1731

Re: Purslane (Portulaca oleracea) seeds

Are these seeds natural or bought from a commercial source? In the second case one possible explanation of the interference colors could be a chemical treatment deposited in fine layers I don't think that the colors could be due to excessive light diffusion, in fact the opposite seems more likely to...
by Pau
Sun Apr 04, 2021 10:09 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Wildflower seeds
Replies: 4
Views: 242

Re: Wildflower seeds

Wow!
They really pop out of the screen
by Pau
Sun Apr 04, 2021 10:07 am
Forum: Photography Through the Microscope
Topic: Springtail polarized
Replies: 10
Views: 450

Re: Springtail polarized

Did you use a full lambda plate? (I think that the purple background and colors can be indicative of it)
If so, test with a 1/4 lambda plate, i use it much more often than the full lambda because I find the colors looking much more natural
by Pau
Wed Mar 31, 2021 2:39 am
Forum: General Discussion Forum and Community Announcements
Topic: article on "blackwater" macro
Replies: 2
Views: 321

Re: article on "blackwater" macro

Breathtaking creatures and images in a nice story!
Thanks for linking it.
by Pau
Sat Mar 27, 2021 1:43 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Eyepieces, photoeyepieces and Teleconverters; what are the similarities and differences? Should we care?
Replies: 24
Views: 1611

Re: Eyepieces, photoeyepieces and Teleconverters; what are the similarities and differences? Should we care?

Try to achieve at least 1.5X and to focus .at the position where the eyepiece diaphragm is expected to be placed

I'll try it nex week
by Pau
Sat Mar 27, 2021 6:03 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Eyepieces, photoeyepieces and Teleconverters; what are the similarities and differences? Should we care?
Replies: 24
Views: 1611

Re: Eyepieces, photoeyepieces and Teleconverters; what are the similarities and differences? Should we care?

Again to clarify, this "tube length increase of 5 mm" is not the same tube length increase that is depicted in the classic graph titled "Tolerance to tube length change versus objective N.A." In the case of a parfocal raised eyepiece, there is no change in the optical tube length as seen by the obj...
by Pau
Fri Mar 26, 2021 4:52 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Eyepieces, photoeyepieces and Teleconverters; what are the similarities and differences? Should we care?
Replies: 24
Views: 1611

Re: Eyepieces, photoeyepieces and Teleconverters; what are the similarities and differences? Should we care?

I am not looking for a permanent solution as direct projection works very well , I just want to have an option when working with very small subjects. If you can't switch to a higher magnification/NA objective this is almost for sure a case where you are in empty magnification zone, so you don't nee...
by Pau
Fri Mar 26, 2021 4:00 am
Forum: Equipment Discussions
Topic: Optical system in AZ100 Microscope?
Replies: 16
Views: 897

Re: Optical system in AZ100 Microscope?

Several people here had poor results by just attaching one of the AZ objectives to a camera lens. So there is nothing magical about the AZ100 zoom body. But somehow there needs to be a $6000 zoom body between AZ 1x and the tube lens or a certain distance between AZ 1x and tube lens for it to work, ...