MicrobeHunter.com Microscopy Forum

Well i've found that my microscope accepts 37mm condenser mounts so the condenser can definitely be situated, my question are there other things now that'll prevent usage of the condenser? Like are condensers similar to infinity optics in that they are not compatible with other microscopes despite ...

For what it's worth, I was receiving the Forbidden Error during the last day or so - up until just now. I didn't do anything to my computer to fix the problem - it just started working again on its own. It basically said I was not permitted to access this site on a particular server. I presumed that...

Speaking of deals - here's a very nice AO/Spencer model 13 in a case for a buy-it-now price of a hundred bucks, plus thirty-four shipping. Looks as though it has never once been used. Been kicking around on eBay for at least a month. http://www.ebay.com/itm/SPENCER-LENS-CO-STEREOSCOPIC-MICROSCOPE-31...

........ There are fairly inexpensive older mid-mag. oil objectives that work almost as good dry as they do with oil too, and so can be put into a 4 objective rotation and do double duty . One, I know for sure is the AO cat. # 1026 50x .85 oil achromat but it is infinity and probably restricted to ...

Stepping down, without removing immersion oil, to 4x (NA 0.1) or 10x (NA 0.25) dry objective is perfectly fine (you may just need to readjust focus slightly). Even 20x (NA 0.4) will work somewhat (but not optimally). Any dry objective more powerful than NA 0.4 would not work well. I'm curious: What...

Visit this page: http://www.cargille.com/immersionoilmicroscope.shtml It will tell you all you need to know, including how to use (scroll way down.) You can buy Cargille immersion oil online at Ebay and Amazon. It's not all that cheap, but an 8 ounce applicator bottle lasts a very long time. And no,...

Thanks for the help! He asks $7 for it. Maybe worth the investment and let the kids play with it :-) That is very little money for a Bausch and Lomb anything, especially almost unused. Here's a link to one on Ebay for about twice that amount, and there are several others available as well. http://w...

It is difficult to find any company literature online for Bausch and Lomb microscopes, but that appears to be a simple model for use in gradeschools. There is a partial photo of one in a 1964 Popular Science Magazine article: https://books.google.com/books?id=3iUDAAAAMBAJ&pg=PA107&lpg=PA107&dq=bausc...

I thought a Barlow lens on a telecope gave it increased magnification, the same as an eyepiece on a microscope. Never had a telescope.......... Dale It does according to this: https://www.telescopesplus.com/blogs/helpful-information/18941444-using-a-barlow-lens But on a stereo microscope the lens f...

Dale wrote:..........
Kurt, tell me, is a Barlow lens the same as an eyepiece? Must now get back to
assembling my Nikon.
Dale

Depends on whether you are talking telescopes or microscopes:
http://www.microscope.com/education-cen ... rlow-lens/


Jim

I've never had the opportunity to use an Olympus, but if the scopes are as good as their eyepieces, then they must be superb instruments.

Jim

Good links, Dale and Lorez; a glossary is a good idea for an initial primary resource...... A is for abberration I had thought A was for Abbe, as in Ernst. ;) Jim yes,correct abbe before aberration Isn't that where aberration comes from? .....his condenser? If you are asking in earnest , well then ...

apochronaut wrote:Good links, Dale and Lorez; a glossary is a good idea for an initial primary resource...... A is for abberration

I had thought A was for Abbe, as in Ernst.


Jim

What is that last picture, and why de-gas mounting medium? I am very interested in learning more about using vacuum techniques, so more than mere idle curiosity prompts the questions. Thank you! You'd de-gas to get the bubbles out of the mounting medium. You know - like with woodworking varnish, yo...

BTW, is it common to make photos with a stereo microscope? I don't remember seeing many... Is it hard to get a good image? (I understand that the stereo effect is lost on photos) I don't know how common it is or was to make photos through a stereo microscope, but American Optical once offered a ste...

There is an excellent book on this subject available to read online, or one can download it for free. It is Principles of Biological Microtechnique: A Study of Fixation and Dyeing by John R. Baker. One may find it here: https://archive.org/details/principlesofbiol01bake I have a hard copy here at ho...

Just picked up a Zeiss Grey Filter 0.5 - think it is catalogue # 46 78 40 Not sure what Grey filters are for, is it similar to a Neutral Density filter? I don't know much of anything about Zeiss equipment, but if those also come with other numerical designations, I would guess that is exactly what ...

Rod, The brightfield image seemed to my uneducated eyes to be the sharpest and clearest. You write that you oiled the condensers to the slide: Other than the darkfield condenser what other condenser(s) were you using? And thanks for going to the bother of posting all these. Such comparisons are alwa...

I don't have the best vision in the world, so it is sometimes difficult for me to judge sharpness or focus on a computer screen, but these photos look pretty good to me. You can't necessarily expect all parts of the object to be simultaneously in sharp focus without some sort of imaging or stacking ...

Tincture of iodine makes an excellent stain for some subjects, particularly starchy things. But $7 an ounce, as in the link, is way too much to pay for it. Try some natural or organic things such as juice from cooked beets, blue or purple grape juice, dark red wine, black or other berries, etc. Gene...

That's three times I've printed-to-PDF this thread now - so much good information being proffered - wonderfully useful and informative chaps. :) Well, John B., for my part, thank-you very much. It's always nice to have one's efforts appreciated. Btw, I visited your new website. Congratulations! Kno...

Something else occurs to me: Have you ever tried focusing the substage condenser for critical illumination? That is, have you tried focusing an image of the LED at the object plane of your scope so that the specimen and LED itself are in focus simultaneously? Try that and see if the top element of y...

Ha! Another night owl! I went and took a look at your link. That's really a fairly decent-looking microscope. It takes more than just the addition of a field iris to give you kohler illumination, though - you'd have to replace or change the focus of the lenses in the illuminator. Even so, the kohler...

Thank you all! I have a Chinese microscope, and the condenser came with the scope, but it's probably designed for critical illumination, because "Kohler Illuminator" that came with it is an optional item to put over the illuminator (LED). Anyway, I decided to use it non-oiled for now, and maybe try...

To be oiled to the slide, the condenser needs to be very close to the slide. On the other hand, for Koehler illumination the condenser needs to be at some greater distance from the slide. How to solve this dilemma? If the condenser is properly matched for your illumination system, it should be clos...

MicroInspector wrote:.....

Any ideas for this jumping spider?.

Let it go free?

That's a very clever DIY adapter! Why didn't I think of that? Looks as though something similar could be made for a point and shoot camera as well.

Jim

MicroInspector wrote:But ebay is auction website and always gives to the highest bidder.
I one guy won for the highest for a case of prepared slides of infectious bacterias
I sm.a victim of supply and demand

Not all items for sale on Ebay are auctions - a great many are Buy It Now. Some are even Best Offer.


Jim

I took the punt. It's gone to a friendly postman in the US to cost less postage. If it's junk he can return it. It's bit odd - this one is probably the same and has better pictures: there's a wedge in the middle.... 272273141502 I'll share when it arrives, though that could be some time. I'm concer...

ChrisR wrote:Thanks - that's a strange one.

According to the 1929 Spencer catalog it is intended for holding - what to many of you would be - old-fashioned safety razor blades. The double edged ones, I believe.

Jim