MicrobeHunter.com Microscopy Forum

An option is always a pair of 12.5X or 15X eyepieces. Both , if designed as proper extensions of the system you have, will provide quality imaging and a larger image circle at any given magnification than a 10X eyepiece will provide, as long as the N.A. of the objective is high enough. Drop the deci...

Reichert changed the lettering format a few times. There is this one you may have already seen. Not exact and not great pictures. https://www.ebay.at/itm/363916493207?itmmeta=01HSKQ1RCV42YQWV0A6CK0WYA3&hash=item54bb1d0197:g:3MsAAOSw~m1i2SkR&itmprp=enc%3AAQAJAAAA4HLOI1NbIitnVtYcXgilgOq0CNur%2FSWhVynr...

It looks like it might be decentered to the right some plus some pincushion curvature. The brown line that runs top to bottom on the left side is slightly bowed in and there is some ca bordering the characters to it's left.

So the telan lens is not contributing any corrections for ca or likely sa either. It is just a convergence lens. The eyepieces that I have from some Poly microscope, I just today pictured in your other thread , seem to have some correction for curvature of field. They have a fairly pronounced concav...

I am trying to do the math and it doesn't work for me. IF you used a 1x objective with a 16mm FN , 15x eyepiece and put a stage micrometer in place, you would observe a 16mm FOV at 15x. If you put used the same objecive with a 10x/20mm FN, you would see a 20mm FOV at 10x. The object would appear to...

3 more.

I made some images of a stage micrometer through the various 10X W.F. eyepieces used from the AO series 4 up to the common one used in the ATC 2000. I also included the recommended eyepiece used in the Stereostar 580. This provides an actual measure of the F.N. of each eyepiece, as measured. I would...

When I reference the FN, I am referring to the field stop diameter of the eyepiece. If you had a 1x objective, with a FN eyepiece of 20mm, you would be able to observe a stage micrometer field of 20mm, if the objective was a 2x, the sample are viewed would be 10mm. It is just as important that the ...

I am interested in knowing what the field capture is and what measurements you used . Telan lens to eyepiece and eyepiece to sensor
The test shot looks good.

Jena and Lomo may have used systems modelled after Pluta. I don't know if Pluta had the same kind of patent protection that was possible in the west at the time.Certainly PZO used a Pluta system but he developed it at PZO. I believe he was a colleague of Nomarski and may be more responsible for the ...

Of course it is the environment.

Yes but no. That is obviously a technique used and it has to be done under magnification but there is no such possibility to then install the lens and seal out particles until the next time the lens is conveniently removed and if contamination of the sensor occurs, easily recleaned. . Assembly of an...

A blower or even compressed air won't remove some. The best I've found for photo optics seems now sold close to hair driers... sorry for this... sold as retractable brushes for makeup. One of my preferred accessory in my photo bag. Most or all dust particles quickly getting away. As it is retractab...

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.

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...

Thanks. Seems like it could be possibly of value.

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...

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 ...

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...

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...

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'...

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.

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...

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...

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.

Good thing you caught that, Hans. I think it a key for the "I" shaped cover plate cap screws required. .060" is the size.

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 ...

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...

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...

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.