Search found 3102 matches

by apochronaut
Wed Apr 15, 2020 10:27 am
Forum: My microscope
Topic: My 1947 Leitz Ortholux
Replies: 5
Views: 537

Re: My 1947 Leitz Ortholux

Some mfg. used the 10:1 , 24:1 etc. designation instead of 10X, 24X. Previous to that , Leitz used a numerical code. Your 10:1 is also called a 3. Generally, it went up from 1 to 8 or 9. The A , means aperture. The same thing as N.A., which means numerical aperture. Mostly, European scopes used thes...
by apochronaut
Tue Apr 14, 2020 12:34 pm
Forum: Microscopes and optics
Topic: Reichert phase contrast objectives?
Replies: 5
Views: 303

Re: Reichert phase contrast objectives?

Although they are not common, you may be able to find a Diavar 2 that needs objectives, within a short distance in Europe.....or a Neovar 2, which might also be a candidate to match those objectives, if it could take a Diavar 2 head.( if the dovetail is the same). The telan lens is different for the...
by apochronaut
Mon Apr 13, 2020 10:50 pm
Forum: Pictures and Videos
Topic: Flagellated Bacteria
Replies: 12
Views: 443

Re: Flagellated Bacteria

The footage is certainly top notch. Never seen anything like that. Is there any chance that I can find some flagellated bacteria too? I really want to observe it myself. They seem to abound in oxygen depleted waters but are quite common in general. Many pathogenic bacteria sport flagella but in som...
by apochronaut
Mon Apr 13, 2020 10:33 pm
Forum: Microscopes and optics
Topic: Reichert phase contrast objectives?
Replies: 5
Views: 303

Re: Reichert phase contrast objectives?

where are you located? Europe?
by apochronaut
Mon Apr 13, 2020 10:30 pm
Forum: Illumination Techniques
Topic: Soviet Plot revealed !!
Replies: 25
Views: 884

Re: Soviet Plot revealed !!

wrong bulb or socket? scientific bulbs often include a filament to some reference point measurement. there are instances of two basically identical bulbs with the filament either higher or lower in the envelope.
by apochronaut
Mon Apr 13, 2020 11:16 am
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 53
Views: 3743

Re: 40x SPlan woes

Your objective specification for the 40X , seems to be correct. Has a rubber grip ring? Just a couple of things to check and or rule out. 1) Given the stated difficulty in comparing the visual image with the camera image, try putting one of the eyepieces in the photo tube( if it is possible..I know ...
by apochronaut
Mon Apr 13, 2020 12:54 am
Forum: Pictures and Videos
Topic: Flagellated Bacteria
Replies: 12
Views: 443

Re: Flagellated Bacteria

Do you have any idea what they were? What was the source of the water? In some of the water sources I collect from yearly, I see numbers of what would seem similar to me but I have difficulty imaging the flagella. The DIC and I presume an apo objective certainly brings out some wanting details . I h...
by apochronaut
Sun Apr 12, 2020 6:08 pm
Forum: My microscope
Topic: Microscopes in use at the Star Party
Replies: 5
Views: 502

Re: Microscopes in use at the Star Party

clamping pairs of neodymium magnets at the outflow of a rain pipe should yield some , especially after a decent period of no rain. we get periods of up to 6 weeks here, some summers.......maybe i should just comb some rhubarb leaves with a magnet!
by apochronaut
Sun Apr 12, 2020 2:08 pm
Forum: Beginner's corner
Topic: Iris+condenser troubles (I need the help of the boards real brain thinkers on this one)
Replies: 3
Views: 375

Re: Iris+condenser troubles (I need the help of the boards real brain thinkers on this one)

So, I found two solutions for you in that box of B & L condenser parts. The 8.9mm focal length 1.4 N.A. achromat you have, has a lower section slightly different than the version that would have been used in a sleeve mount, rather than in an akehurst slide, as yours was used. The neck of the sleeve/...
by apochronaut
Fri Apr 10, 2020 10:39 pm
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 471

Re: Swamps come alive.

I don't clean my sensor but thanks, Everett.
by apochronaut
Fri Apr 10, 2020 10:37 pm
Forum: Microscopes and optics
Topic: oil condenser questions
Replies: 5
Views: 667

Re: oil condenser questions

Rayleigh's Criterion is used to calculate the effect of a dry condenser on an oil immersion objective. For a .90 condenser and a 1.25 objective , the effective N.A. of the objective works out to be around 1.14 or so. The principal negative effects a standard condenser has on high N.A. objectives are...
by apochronaut
Fri Apr 10, 2020 10:14 pm
Forum: Microscopes and optics
Topic: Reichert phase contrast objectives?
Replies: 5
Views: 303

Re: Reichert phase contrast objectives?

I use the 40X objective sometimes, and have used the 100X. Those are the specs. for Reichert infinity plan achromats in the 45mm parfocal series. The 40X .75 is a very good objective for a plan achromat.....as good as any. They can be used on the later Reichert lab scopes; Diavar 2 mostly and will a...
by apochronaut
Fri Apr 10, 2020 10:02 pm
Forum: Microscopes and optics
Topic: Newbie Questions - American Optical 160
Replies: 3
Views: 187

Re: Newbie Questions - American Optical 160

yes cheapo. probably only useful to 400X . You can't really make use of magnifications above about 1250X with even a good lab microscope. The laws of physics intervene. Start with a comfortable range of up to 5 or 600X and take it from there. High magnification requires very excellent equipment , ex...
by apochronaut
Fri Apr 10, 2020 11:56 am
Forum: Beginner's corner
Topic: Iris+condenser troubles (I need the help of the boards real brain thinkers on this one)
Replies: 3
Views: 375

Re: Iris+condenser troubles (I need the help of the boards real brain thinkers on this one)

I'm pretty sure Bausch & Lomb used inch sizing for most of their tooling but it is possible that they switched over to metric later on for some things. I ended up with quite a few odds and ends of B & L condenser parts from a job lot I purchased in order to get some special AO parts. I certainly hav...
by apochronaut
Thu Apr 09, 2020 11:47 pm
Forum: Microscopes and optics
Topic: Newbie Questions - American Optical 160
Replies: 3
Views: 187

Re: Newbie Questions - American Optical 160

Those were made for scholastic use and the magnification marked, represents the total of the system. They are limited to what is marked , around 500X. Adding a higher power eyepiece will over ride the optical capability or N.A. of the zoom objective and while it will increase the magnification, it w...
by apochronaut
Thu Apr 09, 2020 11:16 pm
Forum: Microscopy accessories
Topic: The most important microscope accessory
Replies: 11
Views: 1316

Re: The most important microscope accessory

is that a genuine B&L face mask?
by apochronaut
Thu Apr 09, 2020 10:47 am
Forum: Camera systems and imaging
Topic: Advice on a dark field camera
Replies: 21
Views: 823

Re: Advice on a dark field camera

A big problem with DF is the dynamic range of the camera. The brightly illuminated portions of the image, can tend to flare badly with some cameras and metering systems, because it is trying to average the metering. I don't have a great camera but have had good results by stopping down and lengtheni...
by apochronaut
Thu Apr 09, 2020 10:39 am
Forum: Beginner's corner
Topic: what is the lens under the condenser?
Replies: 3
Views: 291

Re: what is the lens under the condenser?

Usually with an average field condenser, that aux. lens is required for anything from about 5X down. Once you get to 2.5X or so, even that isn't enough. They usually need some way of removing the top condenser lens.
by apochronaut
Thu Apr 09, 2020 10:36 am
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 53
Views: 3743

Re: 40x SPlan woes

I agree. There is an unacceptable level of ca as well as a foggy quality, which doesn't really conform to a spherical aberration problem. What relay lens are you using for the camera? On another note; is the problem the same with the eyepieces, or is it just the video.
by apochronaut
Wed Apr 08, 2020 10:40 pm
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 53
Views: 3743

Re: 40x SPlan woes

I have been following this along and am in general agreement that probably the objective is suffering from spherical aberration but there is still something nagging me , though. This is a plan achromat 40X .70 objective, is it not? It's kind of unusual for an objective of such a modest N.A. to need ...
by apochronaut
Wed Apr 08, 2020 11:18 am
Forum: Beginner's corner
Topic: Want to buy new compound microscope
Replies: 14
Views: 728

Re: Want to buy new compound microscope

That's your second mistake. You appear to be focusing on a brand, not a microscope. Wipe all the names out of your head and buy a microscope, not a brand. Choose it by specification and it's capacity to do what you want to do now and in the future , matching that to your budget. The optics on all mi...
by apochronaut
Wed Apr 08, 2020 1:20 am
Forum: Beginner's corner
Topic: Want to buy new compound microscope
Replies: 14
Views: 728

Re: Want to buy new compound microscope

Don't believe the specifications attached to internet hawked microscopes. They are derived from a theoretical set of data, not an actual set. One microscope every now and then might meet the specs. but the manufacturing variances and slack q.c. pretty much rule out any consistency. Then there is the...
by apochronaut
Tue Apr 07, 2020 8:58 pm
Forum: Microscopes and optics
Topic: Lamp for old light microscope
Replies: 7
Views: 335

Re: Lamp for old light microscope

Lamps such as this were made to be used with horseshoe base microscopes, when a mirror was not available. The lamp could be used with a mirror, in it's vertical position or placed inside the horseshoe in the horizontal position with the filtered window facing up under the condenser. They are usually...
by apochronaut
Tue Apr 07, 2020 4:45 pm
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 471

Re: Swamps come alive.

Thanks, Håkan. Seems like what I have. There will no doubt be billions of them soon. Almost like a colony of Euglena, if I understand correctly.
by apochronaut
Tue Apr 07, 2020 1:23 pm
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 471

Re: Swamps come alive.

What is the scale of each of the "vases" in Dinobryon. The vase shaped sections in the samples I collected are about 20 microns in length. I observed no internal structures, except what I observed below. In pictures, # 4, #5' where a vase structure contains large inclusions, they appear to be single...
by apochronaut
Tue Apr 07, 2020 11:57 am
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 471

Re: Swamps come alive.

Hobbyst46 wrote:
Tue Apr 07, 2020 11:52 am
A very nice report. Are those with the flagella mobile ?
Very much so. The water is yet, quite cold but those that were moving , were right at it. There were some dino flagellates as well( picture 7). The larger movers , seemed to all be chlorophyll bearing.
by apochronaut
Tue Apr 07, 2020 11:54 am
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 471

Re: Swamps come alive.

A few more.
by apochronaut
Tue Apr 07, 2020 11:45 am
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 471

Swamps come alive.

Here on the north shore of Lake Ontario, spring comes a little late, in some years held back by thawing lake ice. The bedrock on this island is limestone shale, formed between successive glacial events over some very ancient and steep mountains, which farther east and north rise to the surface as th...
by apochronaut
Mon Apr 06, 2020 11:45 pm
Forum: My microscope
Topic: IOR MC9 research microscope
Replies: 11
Views: 809

Re: IOR MC9 research microscope

I think I have seen the same microscope only in black, being sold on ebay. Have you contacted Lucien , who sells IOR parts etc. on ebay sometimes? He seems quite knowledgeable.
by apochronaut
Mon Apr 06, 2020 2:16 pm
Forum: Microscopes and optics
Topic: Intriguing objective
Replies: 10
Views: 451

Re: Intriguing objective

note, zoom in quotations. in practice, there are so many such systems that push the envelope of parfocality. many zoom stereo microscopes are so inclined. I think the Bausch & Lomb Dynazoom compound microscope with it's modest 2:1 zoom ratio was a classic parfocal design but I am not 100% sure. Does...