Hi, Indeed an interesting effect. Pardon my ignorance but what is a ‘feathered darkfield stop’ (as opposed to a regular darkfield stop). Mike I think OP is referring "reverse iris darkfield diaphragm", originaly proposed by W. R. Traviss and patented by W. Watson (London, UK) in early 1900s. It's i...

I wonder, why options only are FF(36x24) or APS-C-mode(24x16)...
Wouldn't it be better to use square crop (24x24mm), from the FF picture, so no field is wasted?

Lou Jost wrote: ↑

Wed Apr 07, 2021 7:25 am

Duke, my belated apologies. I had missed that you were not the OP, David Millard. The objective I bought was from him, not you.

Lou, I figured, no worries.

Zed - Thanks for the helpful reply. So far I've only gone up to 10x, but vibration hasn't been an issue using EFCS with mirror-up. The labs probably would go up to 10x, possibly 20x. EFCS certainly is a great thing, it does allow you to get the single picture without shutter shock. However, there's...

Few more particles, for good measure. Episcopic illumination (Nikon Optiphot, Nikon BD Plan 50x 0.85 210/0, Canon 500D) P_3_preview.jpg *ORIGINAL_RESOLUTION* P_4_preview.jpg *ORIGINAL_RESOLUTION* This "rainbow" interference effects happen only on transparent objects, while opaque objects perform mor...

Polished section. Episcopic illumination (Nikon Optiphot, Nikon BD Plan 50x 0.85 210/0, Canon 500D) Cement_Particle_EPI_preview.jpg *ORIGINAL_RESOLUTION* SEM, BSE Cement_Particle_BSE_preview.jpg *ORIGINAL_RESOLUTION* SEM, EDS PHASE MAP Cement_Particle_EDS_preview.jpg *ORIGINAL_RESOLUTION* The First ...

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, ...

I'm curious about "_, A, B, C" letter after magnification meaning, is that objective revisions, may be factory code, no idea.

The transition from focus to OOF is different with telecentric optic, I think the change is more abrupt Nope, not that either. If that's what you're seeing, then I expect it's a matter of other fixed aberrations in the non-telecentric lens that obscure the onset of the particular variable aberratio...

Just out of curiosity, has anyone ever tried the Nikon CFN Plan 20x 0.40 ELWD for focus stacking? The only CFN Plan ELWD 20x 0.40 of 160 mm series I'm aware of is for inverted scope and designed to use with Petri dish, corrected for glass thickness of 1.2mm, therefore it cannot be used without cove...

Hi guys, I've not read the article regarding coverglass thickness mentioned above (my access is limited), I'm sure it's full of calculations only few would understand (I'm not an optical engineer, so me not included). But I've decided to do my own estimation, based on pure geometry, snells law and l...

viktor j nilsson wrote: ↑

Fri Mar 05, 2021 12:28 pm

Those variable ND filters are just two polarizers, one of which can rotate. So it does the exact same thing as the two polarizers you used.

They are circular polarizers back-to-back to be exact, not linear. I've got 2 of 30mm for epi, and 2 37mm for condenser.

On my LED-modified microscopes I've used Adjustable ND Neutral Density ND2 to ND400 filter.
These come in various sizes, so can be easily fitted to almost any filter holder.

The infinity optiphot head I have isn't technically ultra wide... How come it's not UW? Is binocular part design limits FOV or does it have 23mm eyepiece sockets? I've seen heads that look identical to LV-TI of mine, but with different eyepiece sockets, is yours one of those? Thought that that mayb...

Scarodactyl, thx for the test.
Do you still have Nikon CFI-UW trinocular (Optiphot 150/200/300) at your disposal?
I believe it has the same MXA20696 "CFI60-2,CFI60,CF&IC compatible" f=200mm UW tubelens, as used in newer Eclipse heads.
Can you run a test between Nikon CFI-UW and Olympus SWTR?