Search found 192 matches
- Fri Apr 26, 2024 12:40 pm
- Forum: Microscopes and optics
- Topic: BX system and field number (FN) for different configurations
- Replies: 6
- Views: 161
Re: BX system and field number (FN) for different configurations
Two Points, If you have a confocal system, Don't you already have fluorecent capability? Yes, the higher you stack the system there is likelyhood, you will lose FN. Both Visually and to the camera port. I don't know enough about the Olympus design, but if the they have a WF tube for the 26.5 FN, you...
- Fri Apr 19, 2024 11:26 pm
- Forum: Microscopes and optics
- Topic: Leitz/Leica Labovert DIC/ICT
- Replies: 13
- Views: 416
Re: Leitz/Leica Labovert DIC/ICT
It appears you have the required componnents for DIC The Polarizer, Analyser and the objective prism for the 25X L on the slider. It appears the condenser has a matching prism for the 25x (S25) as well? If so, it is complete for DIC on that one objective.
- Thu Apr 18, 2024 8:22 pm
- Forum: Microscopes and optics
- Topic: Partially blocked Leica objective
- Replies: 29
- Views: 792
Re: Partially blocked Leica objective
Thanks all for the input. The catalog number is 506135. I've had a hard time finding info on older Leica parts, and even the current Leica website is sparse with details on their current offerings. As a reference point. The 506135 is a LMC objective. possessing the following specs. N Plan L 40x/0.5...
- Wed Apr 17, 2024 11:28 pm
- Forum: Microscopes and optics
- Topic: Partially blocked Leica objective
- Replies: 29
- Views: 792
Re: Partially blocked Leica objective
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.
- Tue Apr 16, 2024 1:24 am
- Forum: Microscopes and optics
- Topic: how scared should I be of mercury lamps
- Replies: 14
- Views: 576
Re: how scared should I be of mercury lamps
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...
- Sun Apr 14, 2024 11:52 pm
- Forum: Beginner's corner
- Topic: What happened to the Leica DMLB?
- Replies: 11
- Views: 1373
Re: What happened to the Leica DMLB?
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...
- Wed Apr 10, 2024 12:02 am
- Forum: Beginner's corner
- Topic: Leica DMLB Condenser
- Replies: 10
- Views: 1920
Re: Leica DMLB Condenser
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 ...
- Thu Apr 04, 2024 1:54 am
- Forum: Microscopes and optics
- Topic: Leica DMRB- which lenses and prisms for DIC
- Replies: 12
- Views: 891
Re: Leica DMRB- which lenses and prisms for DIC
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...
- Wed Apr 03, 2024 2:54 am
- Forum: Microscopes and optics
- Topic: Averaging condenser and objective numerical aperture when predicting resolution
- Replies: 49
- Views: 4784
Re: Averaging condenser and objective numerical aperture when predicting resolution
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.
- Tue Apr 02, 2024 7:00 pm
- Forum: Microscopes and optics
- Topic: Averaging condenser and objective numerical aperture when predicting resolution
- Replies: 49
- Views: 4784
Re: Averaging condenser and objective numerical aperture when predicting resolution
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...
- Tue Apr 02, 2024 5:26 am
- Forum: Microscopes and optics
- Topic: Averaging condenser and objective numerical aperture when predicting resolution
- Replies: 49
- Views: 4784
Re: Averaging condenser and objective numerical aperture when predicting resolution
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...
- Sat Mar 30, 2024 4:32 am
- Forum: Microscopes and optics
- Topic: GF Planachromat infinity optics for Jenamed microscope
- Replies: 15
- Views: 1512
Re: GF Planachromat infinity optics for Jenamed microscope
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...
- Sat Mar 30, 2024 4:23 am
- Forum: Microscopes and optics
- Topic: Field number vs. field stop diameter in "negative" eyepieces
- Replies: 8
- Views: 1540
Re: Field number vs. field stop diameter in "negative" eyepieces
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...
- Sat Mar 30, 2024 4:22 am
- Forum: Microscopes and optics
- Topic: Field number vs. field stop diameter in "negative" eyepieces
- Replies: 8
- Views: 1540
Re: Field number vs. field stop diameter in "negative" eyepieces
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...
- Thu Mar 28, 2024 12:36 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Wed Mar 27, 2024 2:23 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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 ...
- Tue Mar 26, 2024 2:12 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Sat Mar 23, 2024 6:51 pm
- Forum: Microscopes and optics
- Topic: who has picture of this Reichert objective?
- Replies: 3
- Views: 795
Re: who has picture of this Reichert objective?
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, ...
- Sat Mar 23, 2024 6:46 pm
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Fri Mar 22, 2024 12:58 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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 ...
- Thu Mar 21, 2024 3:52 am
- Forum: For forum members who want to buy and sell equipment
- Topic: WTB AO 570 or 580
- Replies: 5
- Views: 1071
Re: WTB AO 570 or 580
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...
- Thu Mar 21, 2024 3:34 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Thu Mar 21, 2024 12:44 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Thu Mar 21, 2024 12:13 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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 & ...
- Thu Mar 21, 2024 12:07 am
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Wed Mar 20, 2024 11:53 pm
- Forum: Microscopes and optics
- Topic: Leica Reichert Jung Polyvar (models)
- Replies: 88
- Views: 38264
Re: Leica Reichert Jung Polyvar (models)
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...
- Thu Mar 14, 2024 2:28 am
- Forum: Microscopes and optics
- Topic: Reichert U.S.A. and Leica. Why the undercorrection?
- Replies: 10
- Views: 1019
Re: Reichert U.S.A. and Leica. Why the undercorrection?
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...
- Sat Mar 09, 2024 4:32 am
- Forum: Microscopes and optics
- Topic: Polylite SC endusers(?)
- Replies: 49
- Views: 4292
Re: Polylite SC endusers(?)
I don't know if it is the same, but likely is. the distance with a C'mount is 11mm.
- Sat Mar 09, 2024 4:30 am
- Forum: Microscopes and optics
- Topic: How to use the AO10 Teaching Head
- Replies: 9
- Views: 711
Re: How to use the AO10 Teaching Head
Once the cap is removed, just tap on the shaft for the pointer and it will fall out.
- Thu Mar 07, 2024 6:38 pm
- Forum: Microscopes and optics
- Topic: How to use the AO10 Teaching Head
- Replies: 9
- Views: 711
Re: How to use the AO10 Teaching Head
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...