Search found 4759 matches

by Pau
Tue Mar 02, 2021 1:06 pm
Forum: Equipment Discussions
Topic: Olympus BH2 LED Lighting
Replies: 5
Views: 95

Re: Olympus BH2 LED Lighting

Viktor,
I use a Yongnuo YN560EX (GN 58) with a cube beamsplitter in this setup: viewtopic.php?p=224611#p224611

I don't recall having used more than 1/8 power setting for 40X 0.70 DIC, although our systems are very different
by Pau
Tue Mar 02, 2021 11:27 am
Forum: Equipment Discussions
Topic: Olympus BH2 LED Lighting
Replies: 5
Views: 95

Re: Olympus BH2 LED Lighting

Excellent and very clarifying comparison! Thanks for performing and posting it.
by Pau
Tue Mar 02, 2021 2:14 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Purslane (Portulaca oleracea) seed
Replies: 3
Views: 78

Re: Purslane (Portulaca oleracea) seed

Very nice colors and texture!

ADMIN NOTE:
Please note that this thread is better placed here at Technical and Studio Photography -- Macro and Close-up forum. Moved from Nature Photography -- Macro and Close-up
by Pau
Mon Mar 01, 2021 12:14 pm
Forum: Equipment Discussions
Topic: Pentax Auto-Bellows repair parts
Replies: 2
Views: 62

Re: Pentax Auto-Bellows repair parts

Thank you!

PM sent
by Pau
Mon Mar 01, 2021 11:31 am
Forum: Equipment Discussions
Topic: Pentax Auto-Bellows repair parts
Replies: 2
Views: 62

Pentax Auto-Bellows repair parts

My Pentax Auto-Bellows suffered an accident and one of the dovetail shaped nylon sliders broke beyond repair. I have a spare bellows but it has one of those parts partially cracked. Knowing its age very likely the plastic has turned rigid and brittle. Does anyone know a source of parts replacement? ...
by Pau
Mon Mar 01, 2021 11:07 am
Forum: Equipment Discussions
Topic: Light Source for BH2 BHTU
Replies: 8
Views: 208

Re: Light Source for BH2 BHTU

That would be very interesting, thanks!
by Pau
Mon Mar 01, 2021 3:43 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: will a camel pass through a needle eye?
Replies: 5
Views: 169

Re: will a camel pass through a needle eye?

Excellent image, although I can't see the camel :wink:
by Pau
Mon Mar 01, 2021 3:40 am
Forum: Equipment Discussions
Topic: Light Source for BH2 BHTU
Replies: 8
Views: 208

Re: Light Source for BH2 BHTU

Dave, could you compare the convenience of the Saul's and Retrodiode's illuminators for continuous illumination in the same microscope? I'm interested in light intensity, regulation, light quality and mainly ability to set Kölher. Just curiosity because I have both continuous and flash illumination ...
by Pau
Mon Mar 01, 2021 3:11 am
Forum: Equipment Discussions
Topic: Amscope 4x extension distance
Replies: 2
Views: 101

Re: Amscope 4x extension distance

For objectives marked 160/ this distance is 150mm (this is due to the classic microscope design: the "primary" image projected by the objective is expected at the eyepiece aperture placed 10mm below the end of the microscope tube) Anyway, a 4X objective is pretty tolerant for changes in this distanc...
by Pau
Fri Feb 26, 2021 11:53 am
Forum: Photography Through the Microscope
Topic: Birefringence Terminology
Replies: 11
Views: 210

Re: Birefringence Terminology

In this Javier's recent post you can see the oxalate crystals I was referring to, take a look at the linked full size image and you will see few one at extinction:
by Pau
Fri Feb 26, 2021 11:43 am
Forum: Photography Through the Microscope
Topic: Birefringence Terminology
Replies: 11
Views: 210

Re: Birefringence Terminology

Optical activity can be demonstrated in solids as well as solutions. D and L rotary quartz, for example. Sure, although I think that this refers to different causes: organic molecules chirality is caused by the spatial asymmetry of their molecular structure while in quartz this is just impossible a...
by Pau
Fri Feb 26, 2021 5:04 am
Forum: Equipment Discussions
Topic: Nikon CFN Fluor / Planapo 100 160/0.17
Replies: 32
Views: 577

Re: Nikon CFN Fluor / Planapo 100 160/0.17

Soki,

please clarify the difference between the two Stauroneis frustule images you've posted: different objective I assume (and wich ones?) different focus point...
by Pau
Fri Feb 26, 2021 4:58 am
Forum: Photography Through the Microscope
Topic: Birefringence Terminology
Replies: 11
Views: 210

Re: Birefringence Terminology

Leonard, I'm not able to solve your question because of lack of experience with Oxalate and not enough knowledge, but maybe could help to clarify few points - Chirality demostrates in solution (often not easily without a precision polarimeter), not sure up to what point it could be related with bire...
by Pau
Wed Feb 24, 2021 2:11 am
Forum: Photography Through the Microscope
Topic: First attempt at a thin section with a manual microtome
Replies: 10
Views: 348

Re: First attempt at a thin section with a manual microtome

I've used this big scalpel blades with hand microtomes with good success when teaching Microscopy techniques at High School level:
https://www.swann-morton.com/product/33.php
by Pau
Wed Feb 24, 2021 2:01 am
Forum: Photography Through the Microscope
Topic: Nikon plan apo 20x 0.75
Replies: 14
Views: 1226

Re: Nikon plan apo 20x 0.75

Jörgen, thanks so much for the complementary info and sample images!
Sym P. le wrote:
Tue Feb 23, 2021 7:49 pm
Only a microscopist can consider .05 mm a success.
Well, we are microscopists :D
In nanotech it also will matter a lot and in corpuscle Physics it would be a whole world