MicrobeHunter.com Microscopy Forum

# 3 is a bit of a unique objective. It has a very thin and wide annulus, not at all like the annulus in it's two companion objectives and it is situated deeper in the lens stack. It will not work with the 40X condenser annular diaphragm. I have to use the 100X and manipulate both the annular diaphra...

I refrained ftom using telescope terminology. The term apparent seems to be a no no when it comes to microscopes but is widely used when it comes to telescopes. I have used it in the past. In terms of angular field of view then, a 15X eyepiece with an F.N. greater than 13.33333... will have an angul...

The pictures I posted are showing between 18.3 and 20.25 units, with 20 units across an eyepiece that is listed as having an F.N. of 20mm, so the scale must be in mm. So, I am showing the F.N.'s of the eyepieces but it doesn't matter to the current discussion about 15X eyepiece fields because there ...

I decided to check the specs. on the slide. The total thickness is 2.12 mm with a .21 coverslip, so it definitely stresses the condensers capability to project the diaphragm accurately, not to mention the overripe sample thickness. The point of this excercise was to illustrate that the 45mm Reichert...

This is a thread branched off of another recent AO/Reichert/Leica thread. https://www.microbehunter.com/microscopy-forum/viewtopic.php?f=5&t=8625&p=143035#p143035 Four images of the same Fragillaria diatom taken through 4-40X phase contrast infinity objectives with the 182.5mm reference length that ...

Anhydrous Ethyl Alcohol. U.S.P. + 432526. and yes, the coatings may have been imperfectly deposited but who would suspect that at the outset. Previously I.P.A. was probably the strongest solvent I had used on them with no effect. Ethanol speckled them immediately. Henceforward I use nothing stronger...

I once had ethanol damage a costing that was on an objective made in Germany.

The alloys in those front bezels are usually unknown but are designed to be corrosion resistant. They have been variously alloys with anything from iridium through gold to nickel. The nickel alloys obviously weren't great but they were never intended to get wet with anything but did. One front bezel...

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.