MicrobeHunter.com Microscopy Forum

do you have the catalog number for the objective. As pointed out, likely a Modulation contrast objective. also called LMC. Leica Modulcation Contrast. ala Hoffman.

All comments listed are valid, One point of caution would be not to leave the lamp in the scope or lamp house durng transport. Also do not touch the envelop of the lamp. It is not glass, and the oils from your fingers will weaken the envelop during the periods of the lamp in operation. That could le...

Interesting writeup Pete. I know you touched on some of these points in your brands PDF—which by the way was a huge help. It's still odd to me that there isn't even one reference to the DMLB model anywhere on the official Leica website. I agree with you about the move to electronic automation being...

This scope has a Dual view attachment below the viewing tube, so inserting an analyser is possible, but may require stopping down the eyepeice FN to 20mm if it is at 22 now. Depending on the viewing tube. The condenser pictured is the 11501183 Aplanatic/Achromatic 0.9na. the P indicates Strain free ...

As Pete M pointed out, the Condenser Prism and Objective Prism in this scope are for the 40x and 100x objective. I too am curious what objectives are on this scope, They don't appear to be Leica objectives. I don't recall there ever being black barrels on any Leica objectives except for the very low...

The Gold Standard for specimens that demonstrate resolving capabilities is the Pluerosigma diatom. It is very easy to see the impact of reducing the NA of the objective by closing the condenser.

These were the images I wanted to share in my earlier post. I think they can help visualize the objective NA/Condenser NA relationship. Unfortunately it does not show what happens to working distance as the NA increases. But you can see the change in tne Angular Aperture Angle increasing as the NA i...

I still have not figured out how to post images into these threads, b/c if have some that will graphically show what I discuss below. It seems there is some room to simplify the discussion. Although the subject question of Averaging the condenser and objective NA to predict resolution is being queri...

Frequently a 1x compound objective will need a contrast cap, especially for reflected light applications. A polarizer is placed in the light path, and the contrast cap is mounted over the front of the objective. It is essentially a 1/4 wave plate that can be rotated for the best contrast as you obse...

This may be QWERTY vs. Dvorak keyboards. Having gotten used to field numbers, FN certainly eems simple enough. Use a 10x/22 eyepiece and I expect to see a 22mm wide field with a 1x stereo objective and a 2.2mm field with a 10x compound objective. Put a ruler or micrometer slide down and take a look...

This may be QWERTY vs. Dvorak keyboards. Having gotten used to field numbers, FN certainly eems simple enough. Use a 10x/22 eyepiece and I expect to see a 22mm wide field with a 1x stereo objective and a 2.2mm field with a 10x compound objective. Put a ruler or micrometer slide down and take a look...

In my forty years of working in microscopy, I have never heard of or had defined what an “image circle” is relative to the image size. And frankly the description in this thread makes it even less certain. Apochromat, I can’t continue with this thread, you are conflating and confusing recognized mic...

F.N. is an arbitrary system. It is a code system stamped on some eyepieces, only some. There seems to be a begrudging compliance on the part of manufactuers. Maybe there is a reason? In existence, and you can look them up on ebay right now and find at least some of these, so they sre pretty common ...

I am now beginning to see how ts has been confusing. Scarodacyl’s is a fair description of what happens in a microscope system. If one were to take the eyepiece out of the system, with an infinity objective, with a bright enough light source the image would be projected to the ceiling. The magnifica...

I have two of these objectives. It is difficult to image wihout glare, but i can tell you it says on the side. Plan 10x/0.25 bekow that printing is the infinity sign,/- np on one and a P on the other. Yours has the IK, all three labels were used to indicate strain free status. On the opposite side, ...

Phil, i need to do some of my own testing. i am not sure what you mean by Base 10. Our math system when using metric is base 10. I don't know the scale of the micrometer you are picturing, but it all of the images you took are with the 10x objective. The objective will see the same distance, that is...

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 ...

I have a 580 with photo adapter, and 1x mount 10x eyepieces. Also OEM style focusing post stand I also have a ring light or double branch guide fiber optic illuminator? I may have some other illuminator pieces, but need to sort that out, like vertical illuminator mirror housing. Works with 369 illum...

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 r...

All very good information, Wayne. You certainly fill in a lot of gaps. After you help out Pete, with his D.I.C. quest, could you comment on this. One thing I don't see factored in, is the objective distance to the telan lens. The reference focal length,probably the same referred to in patents as th...

There's an estimate in this thread that some models of Polyvar originally cost 'tens of thousands of dollars'. Does anyone know more precisely? Perhaps find an original price list. I've read that a fully specced Leitz Aristoplan had a cost of roughly 100 000 USD. I wonder what fully specced (DIC & ...

Being completely new to the Polyvar MET, what are the best objectives? I assume they made other Fluor's and APO's. My MET came with; Plan Fluor 50x/0.85 Epi Plan 20x/0.40 Epi IK Plan 5x/.0.10 Epi Plan 2x/0.04 -JWW: I assume you have the camera controller and power supply for the lamp? The most comm...

Thanks very much for that, Wayne. On the chance you might know and have time to reply: - For a given objective (say, Plan Fluotar or Leica "N") how much improvement, if any, was there from the old black letter DMR Delta optics era versus the newer red letter and HC DMR era? One assumes that while t...

First let me clarify from my perspective the relationship the different factories had in the Leica family of products. Lots of points to reference here, I hope I can keep it straight. The Buffalo infinnity based products. those that carried the AO/Reichert-Jung branding, used uncompensated eyepieces...

I don't know if it is the same, but likely is. the distance with a C'mount is 11mm.

Once the cap is removed, just tap on the shaft for the pointer and it will fall out.

If you unscrew the end of the pointer control, it looks like it has a flat headed screw slot on the very end, but that is for rotating the bulb inside the shaft for maximum intensity and homogeneity. You will gain access to the base of the pointer bulb. Take care not to lose the spring that contacts...

Parfocal distance is 45mm.

Just found the second 184 15x so I now have a pair. Very good Condition. Make and offer if you still need or want them

I have a pair of 182 15x eyepiecesin New condition. Can't remember which product line they originated in, but keep in mind the eyepieces for the Series 10 were uncompensated and the usual max FD was 18mm. These would probably work with out any problem. If interested make a reasonable offer.