MicrobeHunter.com Microscopy Forum

The early U.S. made microscopes had that peace sign base( how ironic), and in parallel development European microscopes were evolving with the horseshoe base. The American type base is also called a Jackson base or to refer to the whole instrument a Jackson Stand. As things moved along in the late 1...

so, the rule of thumb is that for achromatic objectives, you can push the magnification 1000X the N.A., so Olympus has deliberately put a 1.25X in the changer, so you can maximize the magnification of your 1.25N.A. objective with 10x oculars. The same is true with the 20x .40 , using the 2X mag. cha...

Comparisons of this type are sometimes valuable, if they are done like a mini-science experiment, with variables eliminated or at best kept to a minimum. It's always helpful if the experimenter knows what they are doing as well, if only in terms of trying to eliminate spurious elements that might al...

Thank you, Rod. Hard to remember exactly but most of those parts came in a couple of really cheap joblots, so I'm guessing that the total for the microscope would be in the 50.00 range. I don't use the achromats much but every time I have the opportunity to use them, I get surprised at how good they...

Picture 16 is an old dirty binocular head. The binocular prism and first surface mirror section is removed from the housing by removing 4 slot machine screws that are installed upside down up into the diopter section. With them out and the one slot screw fastening the focus follower for the telon le...

The seized focus was most probably thought to be a mechanical problem by a previous owner, or serviceman. Putting a fair amount of torque on the focus knob( with a heavy glove and a firm grip), showed a tiny bit of movement, so it was pretty clearly hardened grease. In picture 2, either end of the w...

This will be continued in 5 picture increments. There are 17 pictures in all covering the refurb., to completion. The stage was an uncommon left hand version and needed a full refurb itself, so I pilfered a fairly good stage from another, much better instrument. One of the defects that old 10's can ...

I was asked to find a microscope for a friend's son, who is going into grade 9. Long gone are the days, when 12 year olds started out with a Tasco or Lumex, since used R.M.S. microscopes are so common and cheap. I had a derelict series 10 frame, which I collected somehow in a job lot, and was keepin...

We are well into the era, where almost everyone expects W.F. imaging. A few don't, and there are some wise ones who accept the narrow field of older apochromat/compens combinations, knowing that the likelihood of putting together a similar economical plan W.F. combination, is likely a long way off. ...

https://user.xmission.com/~psneeley/Per ... oscope.htm

just scroll.

Objectives are a pain when mix n matching, B&L brass, very short, lomo 33, Jena 35, Beck and Wild.. 38? DIN 45. All 160 and all different. I had to mod my Zeiss to work with them all. Luckily the worst mismatch I made was a Leitz 170. Many Lomo's are 190. I'm pretty sure, objectives over 170mm tube...

I like your collection of antique lab glassware.

Here is another set that is a little different. https://www.ebay.com/itm/All-Metal-195-Plan-Achromatic-Objective-Lens-4X-10X-40X-100X-for-Bio-Microscope/262906595497?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160727114228%26meid%3D9b24d705198b486695e2e898bb5e8320%26pid%3D100290%26rk...

Hi, fibreoptix, I find it odd that these new and unbranded chineese objectives do not list their: 'tube length' as a spec!? : 160 tube length...sigh, they are RMS standard: about???34mm?? length Charlie Guevara finger lakes/US Charlie G. It is not unusual for student grade optics to be unmarked as ...

The LWD objective necessity, is due to the use of containers with thick bottoms or the need to see through the slide, rather than the coverslip. My point was, if cover clip bottom containers are used, one no longer is limited to L.W.D. objectives, and as good as some of them are, higher N.A. planflu...

Some of the student microscopes used such a configuration, with shorter than normal objectives. Presumably, your 100x objective is 25mm or thereabouts long.

Kurt, Your 1820 is in very nice shape and is virtually identical to my 1820. I can't speak highly enough of this model, it's the go-to pond-water scope. I see you have the 1825 mechanical stage; this is relatively rare, considering how many I've ever seen on ebay. I painted mine flat black to match...

Very nice acquisition. Seems to work well too. What a versatile instrument. I have a question about those that you might be able to answer, since you have one, as well as a 120. Those only ever came out sporting the group of 34mm parfocal objectives, L.W.D. but they are correced the same as all the ...

I am unclear what you are implying with this demonstration?

what a family! such beautiful design and construction.

I wouldn't think, normally. The planachromatic image that you posted looks like there is something wrong. There should be no difference in the sharpness between a planachromat and a planapochromat, nor if either of them were not plan and the degree of difference in contrast represented in those imag...

The differences are not startling but they are there. Looking at still images doesn't give an accurate representation of the overall sense of increased accuracy that using objectives with enhanced colour correction gives. Fluorites are usually closer to apochromats than to achromats but within a par...

There was a later version of the elevating base called a Mipolam Pad. It was more rectangular, extending outside the base of the "T" , with sloping arm rests. It was recommended when a fluorescence illuminator was installed, which hung below the base of the microscope. The one included with your mic...

Welcome. Not a big jump from the patterns of protists to the patterns on fabrics. In fact, I am sure that many of them were spawned( if that is the correct term) out of biological observations. Yes; you have researched well. The AO 150 and Reichert 150 are the same,with pretty much just a paint job ...

Highly unlikely. One often gets an image when using infinity corrected objectives in a fixed tube microscope but the image quality is very poor. I one were to install the correct telon lens at the correct location in the fixed tube system, it is possible that it could be converted but only to use th...

It isn't whether a head is infinity or not, it is how the objectives are corrected and whether the tube lens of the system is matched to the objectives. Somewhere up the tube, is a telon lens that converts the image from infinity to convergent. The telon lens also might perform various other tasks, ...

That is a binocular from a series 2/4, so 160mm. AO never used metric measurements and only the occasional metric screws show up in them, so the actual measure of the wide part of the dovetail on that head is 1 7/8", or pretty close to 47mm. The infinity heads are 2" or 50.4mm. There was a compensat...

I will try one more time. All American Optical, Cambridge Instruments, Reichert or Leica infinity corrected microscopes that were made in the Buffalo factory had retractable nosepieces, a design allowing the stage to remain stationary. Other microscope companies are now adopting it. All objectives m...

I looked to see, if I had an extra .7X but only a 1X. I messaged you through the system and included my email.

I did a couple of quick tests for you. With the 9X eyepieces and a 1.0X objective, the actual field viewed is 20mm. With the 9x eyepieces and the .7X objective the actual field viewed is 27.5mm. Using the 10X W.F. eyepieces and the 1.0X objective , the actual field viewed is 18mm. With the 10X W.F. ...