Search found 6233 matches

by apochronaut
Tue Mar 19, 2024 3:03 am
Forum: Microscopy accessories
Topic: Anti-Static for lenses.
Replies: 9
Views: 442

Re: Anti-Static for lenses.

I've cleaned a lot of lenses. Seems that particles do cling with a charge. A blower or even compressed air won't remove some. I eventually get them clean but I have a feeling a discharge might help. It's multiple locations.
by apochronaut
Mon Mar 18, 2024 9:03 pm
Forum: Microscopy accessories
Topic: Anti-Static for lenses.
Replies: 9
Views: 442

Re: Anti-Static for lenses.

They do both apparently. The lever or trigger produces a positive polarity on the in stroke followed by a negative polarity on the return stroke., by compressing Piezo-electric crystals. Their origin goes back to their use in darkrooms. Hair dryers go back to their use in bathrooms. I think they wou...
by apochronaut
Mon Mar 18, 2024 9:08 am
Forum: Microscopy accessories
Topic: Anti-Static for lenses.
Replies: 9
Views: 442

Re: Anti-Static for lenses.

Thanks. Seems like it could be possibly of value.
by apochronaut
Fri Mar 15, 2024 2:58 pm
Forum: Microscopes and optics
Topic: Reichert U.S.A. and Leica. Why the undercorrection?
Replies: 10
Views: 545

Re: Reichert U.S.A. and Leica. Why the undercorrection?

Here's a shot at summarizing the discussion of eyepiece corrections in a table. There are surely omissions and likely errors. Let me know and I'll update it. . AO, Reichert, Leica eyepiece corrections.png edit. I wrote all this before I saw your pictures but they confirm my suspicions. I don't thin...
by apochronaut
Thu Mar 14, 2024 2:32 pm
Forum: Microscopes and optics
Topic: Leica Reichert Jung Polyvar (models)
Replies: 48
Views: 32109

Re: Leica Reichert Jung Polyvar (models)

wbutter would know. He indicated to me that he was primarily in sales. If you look at the economic data of the time and before though, a rough picture can be obtained. At the time of AO's acquisition of Reichert in 1961, the average Austrian worker made 1/3 that of the average worker in the U.S. By ...
by apochronaut
Thu Mar 14, 2024 11:27 am
Forum: Microscopes and optics
Topic: Reichert U.S.A. and Leica. Why the undercorrection?
Replies: 10
Views: 545

Re: Reichert U.S.A. and Leica. Why the undercorrection?

Well, I'm still up in the air why the 34mm Buffalo objectives and presumably those from Vienna made for models like the Neovar 2 and the 45mm Vienna objectives have the same corrections but the later 45mm Buffalo objectives don't. In fact I have used 34mm AO objectives on 11mm extensions, 45mm Reich...
by apochronaut
Thu Mar 14, 2024 1:28 am
Forum: Beginner's corner
Topic: What happened to the Leica DMLB?
Replies: 8
Views: 400

Re: What happened to the Leica DMLB?

Wow. You mentioned short sighted. That should be the main title of your post. The big oversight is U.S. foreign policy . Do you thnk Olympus and Nikon emerged from the vacuum they were in to become dominant players or Toyots or Honda , without complicit acceptance by the U.S. gov't? Was it because t...
by apochronaut
Wed Mar 13, 2024 12:17 pm
Forum: Microscopes and optics
Topic: Reichert U.S.A. and Leica. Why the undercorrection?
Replies: 10
Views: 545

Re: Reichert U.S.A. and Leica. Why the undercorrection?

With the series 400, the planachros were 45mm barrel tweaks of the fully corrected 34mm objectives for some of them and really, that is just a matter of lengthening the barrel but they altered the corrections too and designed a group of new planachro and then planfluor objectives on top. They weren'...
by apochronaut
Wed Mar 13, 2024 5:10 am
Forum: Microscopes and optics
Topic: Reichert U.S.A. and Leica. Why the undercorrection?
Replies: 10
Views: 545

Re: Reichert U.S.A. and Leica. Why the undercorrection?

Both design teams had the designs based on a complete correction model at their fingertips. The Reichert Austria wider field designs were 30mm f.n. too.
It seems it was a choice for a technical reason.
With Leica, perhaps it had somerhing to do with Confocal.
by apochronaut
Wed Mar 13, 2024 3:53 am
Forum: Microscopes and optics
Topic: Reichert U.S.A. and Leica. Why the undercorrection?
Replies: 10
Views: 545

Reichert U.S.A. and Leica. Why the undercorrection?

When Cambridge Instruments and Wild-Leitz merged in 1991, thd newly named Leica carried forward an AO design strategy of undercorrecting objectives slightly, then completing the correction downstream in either the telan lens or the eyepieces. Apparently, Leica still does this today. Here is the hist...
by apochronaut
Tue Mar 12, 2024 10:06 pm
Forum: Microscopy accessories
Topic: Anti-Static for lenses.
Replies: 9
Views: 442

Re: Anti-Static for lenses.

Objectives need be taken apart only if there is de-lamination of cemented lenses or oil seepage into them. Possibly too, if you happen to drop one in your hot chocolate or just as you set your prize red 60MM parfocal giant upside down on the bench, your Chihuahua mistakes it for a fire hydrant. Alig...
by apochronaut
Mon Mar 11, 2024 8:29 am
Forum: Microscopy accessories
Topic: Anti-Static for lenses.
Replies: 9
Views: 442

Anti-Static for lenses.

Cleaning microscope glass is tricky sometimes because of static. Even compressed air doesn't deal with many stubborn hitchhikers. Has anyone used an ion beam anti-static gun ? Many audiophiles use and swear by them for cds and vinyl records.
by apochronaut
Mon Mar 11, 2024 7:17 am
Forum: Microscopes and optics
Topic: What are these square-lobed 4- and 6-sided screw heads used in the Reichert 410 Microstar IV?
Replies: 9
Views: 2381

Re: What are these square-lobed 4- and 6-sided screw heads used in the Reichert 410 Microstar IV?

Good thing you caught that, Hans. I think it a key for the "I" shaped cover plate cap screws required. .060" is the size.
by apochronaut
Sun Mar 10, 2024 8:33 pm
Forum: Microscopes and optics
Topic: What are these square-lobed 4- and 6-sided screw heads used in the Reichert 410 Microstar IV?
Replies: 9
Views: 2381

Re: What are these square-lobed 4- and 6-sided screw heads used in the Reichert 410 Microstar IV?

Those are larger. The screws on the series 10 head are 6 flute .048". I don't know the McMaster-Carr number. Newman tools not too far from me near Ottawa has short and long Bristol keys. They used to have a facility in Harford Ct. too but it doesn't seem to have an address or phone as of just after ...
by apochronaut
Sun Mar 10, 2024 3:35 pm
Forum: Illumination Techniques
Topic: Epi Kölher illumination and infinity corrected systems
Replies: 7
Views: 463

Re: Epi Kölher illumination and infinity corrected systems

I think also due to the not perfect nature of filaments. Some might wonder why certain scientific bulbs are so expensive. Some of that expense is due to the effort put into matching the filament coil to the illuminator optic. The illuminator optic is trying to convert that filament image which is of...
by apochronaut
Sat Mar 09, 2024 6:39 pm
Forum: Illumination Techniques
Topic: Epi Kölher illumination and infinity corrected systems
Replies: 7
Views: 463

Re: Epi Kölher illumination and infinity corrected systems

The condenser has to focus the diffuse Köhler beam on the object, and at a working distance dependent distance, irregardless of whether the objective is infinity or finity. Interestingly, there are infinity condensers , which were used mostly in older microscopes. When the sun or a remote illuminato...
by apochronaut
Sat Mar 09, 2024 3:04 pm
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

If I was doing it, I would make a mock up out of cardboard tubing, ABS pipe, sonotube, or something similar to see what the projection comes out like first. A packing tape roll is 48m and wide enough to avoid vignetting and a toilet paper tube might be at the narrower end of the spectrum.
by apochronaut
Sat Mar 09, 2024 9:31 am
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

What should the measurement be from the eyepiece shoulder to the flange on a 50D? What camera are you using? I don't recall. -JW: Eyepieces are all different in height from their mounting shoulder to the eyelens or projection surface, so I don't use the eyepiece shoulder as the beginning point for ...
by apochronaut
Sat Mar 09, 2024 12:11 am
Forum: Microscopes and optics
Topic: How to use the AO10 Teaching Head
Replies: 9
Views: 365

Re: How to use the AO10 Teaching Head

There is a little flange on the bottom of the bulb that it pushes up to yo install. If you can grip that, it should just pull out.
by apochronaut
Sat Mar 09, 2024 12:03 am
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

I was wondering about the depth of that big camera. I thought maybe 20mm. Mirrorless are a lot less : 15mm or so. With the 10X eyepiece you will have to use a shallow Canon bayonet to M42 female and the shallowest helical focuser of that type which is 12mm to 17mm or something in that range. It woul...
by apochronaut
Fri Mar 08, 2024 8:46 pm
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

I did fo a quick measure on one of my infinity 7 1/16"/182mm systems and with the 19mm f.n. photo eyepiece sitting parfocal in the 182mm rube, my APS-C 23.5mm sensor sits 58mm above the top of the eyelens. You are projecting a 24mm field to a sensor very close to the same size, so you are going to h...
by apochronaut
Fri Mar 08, 2024 7:00 pm
Forum: Illumination Techniques
Topic: Condenser Alignment.
Replies: 17
Views: 834

Re: Condenser Alignment.

Give it up! Did I tell you to take your condenser apart? I made a post about adjusting it laterally, not disassembling it. Maybe there is some software that can fix it.
by apochronaut
Fri Mar 08, 2024 6:57 pm
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

Looks positive. Is your WPK 10X sitting on182mm above that top lens? It depends on where you want me to measure from. Right now it's 153mm from the top physical glass lens to the top of the WPK 6.3 eyepiece. So I'm 29mm sort of that. I do have some vertical adjustment in the Wild 40/14 adapter, but...
by apochronaut
Fri Mar 08, 2024 5:32 pm
Forum: Illumination Techniques
Topic: Condenser Alignment.
Replies: 17
Views: 834

Re: Condenser Alignment.

I don't think that example is with an aux. lens. In this example the condenser lateral plane is not perpendicular to the optical axis of the objective. Racking the condenser up and down a little will bring the 5 :00 condition into view at 11:00.and visa versa. In this case the hemisphere centered ar...
by apochronaut
Fri Mar 08, 2024 4:21 pm
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

If you are searching for documentation for the Polylite 88, the Leica version became the Leica INM 20, 100, 200, so a search of that might bring some newer stuff. The numbers relate primarily to the stage : wafer chuck size. 88 meaning 8"x 8", 100mm, 200mm.
by apochronaut
Fri Mar 08, 2024 9:03 am
Forum: Microscopes and optics
Topic: Polylite SC endusers(?)
Replies: 39
Views: 1306

Re: Polylite SC endusers(?)

Looks positive. Is your WPK 10X sitting on 182mm above that top lens? On my setup, the APS-C sensor then sits roughly 65mm above the 10X eyepiece to get the 20mm field stop just outside the sensor corners. You are projecting a bigger field with a 24mm eyepiece. Your camera might need to be closer. U...
by apochronaut
Fri Mar 08, 2024 7:16 am
Forum: My microscope
Topic: Does Anybody Recognize this Inverted 'Scope?
Replies: 33
Views: 3058

Re: Does Anybody Recognize this Inverted 'Scope?

Is there anywhere that looks like a location that might have housed a ground glass filter? Maybe got damaged or thought to be precious, like the missing sliders.
by apochronaut
Thu Mar 07, 2024 11:56 pm
Forum: Microscopes and optics
Topic: Olympus CX43 any thoughts ,made in China apparently
Replies: 19
Views: 746

Re: Olympus CX43 any thoughts ,made in China apparently

It needs to be remembered that the Oz dollar is even less than the Canuck dollar, so we see a U.S. price and go, + 35% and those who see an Oz or Canuck price conversion for a U.S. listing think that the price is outrageous. Yes, shipping can be high, when you aren't in the U.S. : I pay a minimum of...
by apochronaut
Thu Mar 07, 2024 9:19 pm
Forum: My microscope
Topic: Does Anybody Recognize this Inverted 'Scope?
Replies: 33
Views: 3058

Re: Does Anybody Recognize this Inverted 'Scope?

Your iris has to be a condenser iris, so no field iris but I suspect that those rings are the field apertures for the two higher objectives, essentially preset field apertures, instead of an adjustable one. The only value of the field iris in establishing Köhler is that it gives you something to foc...
by apochronaut
Thu Mar 07, 2024 6:24 pm
Forum: My microscope
Topic: Does Anybody Recognize this Inverted 'Scope?
Replies: 33
Views: 3058

Re: Does Anybody Recognize this Inverted 'Scope?

How far is the iris from the condenser front lens ( the one on top) and and are there any lenses between the iris and filament?