Search found 32 matches

by PeteM
Sat Jan 23, 2021 5:06 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Weekend macros
Replies: 8
Views: 512

Re: Weekend macros

Wow.
by PeteM
Sat Jan 16, 2021 7:17 pm
Forum: Equipment Discussions
Topic: Can someone tell me the difference between these two Nikon apos?
Replies: 14
Views: 363

Re: Can someone tell me the difference between these two Nikon apos?

The silver one is fairly old - I believe before the "chrome free" era. Still likely of excellent quality but may require some compensation in the eyepiece.

The "genuine" black painted one isn't one I'm familiar with as a Nikon.
by PeteM
Fri Jan 15, 2021 10:18 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Advice please: High NA air objective with small WD
Replies: 15
Views: 3860

Re: Advice please: High NA air objective with small WD

Many reflected microscopes offer a darkfield option. It won't help, of course, with an objective not intended for darkfield (with an illumination cone surrounding the objective). But it might be a way of getting images from an alternative high NA dry objective -- with less of that flat "deer in the ...
by PeteM
Mon Jan 04, 2021 11:04 pm
Forum: Equipment Discussions
Topic: Monochromatic Microscopes?
Replies: 21
Views: 980

Re: Monochromatic Microscopes?

One might argue that a SEM is a microscope designed from the ground up to be monochromatic . . . and achieves incredible resolution as a result. So, it's been done, sort of. As for light microscopes in the visual range, while there's a slight gain in resolution, the loss of color is a pretty big dea...
by PeteM
Tue Dec 29, 2020 10:44 pm
Forum: Equipment Exchange
Topic: Insert for the Olympus phase condenser
Replies: 3
Views: 263

Re: Insert for the Olympus phase condenser

Hi Saul - I have that condenser and would by happy to give it a try. PM me if you don't already have one on offer. A few of our "Micronauts" might find this of interest as well. FWIW, the ID from under the condenser measures around 34.08mm. The plastic spring tabs will need to reach out a bit (or th...
by PeteM
Tue Dec 29, 2020 12:36 am
Forum: Equipment Discussions
Topic: microscope recommendations
Replies: 12
Views: 754

Re: microscope reccommendations

I'll second the opinions above. The Optiphot is a fine scope - better than the CH2 and better (brigher lamp) than the 20 watt BH2's and essentially near (Optiphot 1) or equivalent (Optiphot 2) to Olympus BHS (assuming your fine focus is OK - easily repaired if not). An F type Nikon trinocular head w...
by PeteM
Tue Dec 29, 2020 12:29 am
Forum: Equipment Discussions
Topic: Nikon UN power supply lamphouse PLUG
Replies: 2
Views: 314

Re: Nikon UN power supply lamphouse PLUG

Most likely a "Cinch" blade-type connector. https://www.digikey.com/en/products/det ... CT/1278735
by PeteM
Fri Dec 25, 2020 1:12 pm
Forum: Beginners Micro
Topic: Microscope for crystal photography advice
Replies: 9
Views: 382

Re: Microscope for crystal photography advice

That's a very good scope. It looks to have DPlan objectives and those are good for photography up to the field limit of the usual Olympus trinocular photo relay lens and usually OK for simple polarization even without being selected and marked for Pol. You'll need two polarizers (one of which is com...
by PeteM
Sun Dec 20, 2020 2:06 pm
Forum: Photography Through the Microscope
Topic: Silver nitrate
Replies: 3
Views: 502

Re: Silver nitrate

Thanks for posting those images. Between elon and silver nitrate, it sounds like you've found a cache of darkroom chemicals?
by PeteM
Wed Nov 18, 2020 12:07 am
Forum: General Discussion Forum and Community Announcements
Topic: Interesting stuff
Replies: 18
Views: 2813

Re: Interesting stuff

Could be drill rod, given the length. If so they would be in the same sizes as drill bits, but without the flutes, and likely made of tool steel. Might try a "spark test" to get a rough idea of the type of steel.
by PeteM
Sun Nov 15, 2020 10:53 pm
Forum: Equipment Discussions
Topic: Microscope Recommendation + Fitting
Replies: 2
Views: 1516

Re: Microscope Recommendation + Fitting

You might consider a used microscope in good condition, such as an Olympus (BH2,BHTU,BHT,BHS) or Nikon Labophot/Optiphot. Don't know about the UK, but in the US those models would be available near your budget. The newer scope will not be built as well, will not have as fine a focus mechanism for re...
by PeteM
Sun Oct 25, 2020 10:17 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: centering springs
Replies: 9
Views: 2114

Re: centering springs

These are examples of spring plungers; which would work fine for one point of contact: https://www.mcmaster.com/spring-plungers/hex-drive-long-nose-spring-plungers/ The other two can just be thumb screws, with springs under the heads if you wish to eliminate backlash. There are plastic thumb screw c...
by PeteM
Sat Oct 24, 2020 2:42 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: centering springs
Replies: 9
Views: 2114

Re: centering springs

Couple thoughts. First, consider using a 3 point suspension; such as is near universal for microscope heads, condenser mounts, etc. Simpler and less prone to jamming. You'll have one plunger located in a detent on the inner part and two centering screws. For the plunger you can buy off the shelf spr...
by PeteM
Sat Oct 10, 2020 11:25 am
Forum: Equipment Discussions
Topic: Olympus BX stage keeps drifting down, "focus shifting".
Replies: 20
Views: 3262

Re: Olympus BX stage keeps drifting down, "focus shifting".

In addition to the possible causes noted above, thickened grease along the stage slide (a series of crossed bearing cylinders) can be the culprit. There is always some backlash in a geared system and (at least on my two BX scopes) the weight of the stage is what settles it to the lowest point when y...
by PeteM
Thu Sep 24, 2020 12:24 pm
Forum: Photography Through the Microscope
Topic: Diatoms DIC
Replies: 8
Views: 1350

Re: Diatoms DIC

Skillfully done. Looks like your quest for DIC has been rewarded.