Search found 4100 matches

by apochronaut
Thu May 06, 2021 9:32 pm
Forum: Microscopes and optics
Topic: Olympus SP x100 oil behaves strangely!! am I crazy ?
Replies: 7
Views: 126

Re: Olympus SP x100 oil behaves strangely!! am I crazy ?

It looks to be a reflection from either the concave surface of the front lens, or the lens behind the missing front lens, if it is missing.
by apochronaut
Thu May 06, 2021 6:11 pm
Forum: Microscopy accessories
Topic: Buying expired slides - hit or miss
Replies: 7
Views: 87

Re: Buying expired slides - hit or miss

Same with coverslips, which will fuse with a coating into nice murky glass block. If you had enough of them you could build a bathroom window.


lt is odd that some do and some don't. Possibly the result of differing glass composition.
by apochronaut
Thu May 06, 2021 1:43 pm
Forum: Introduce yourself
Topic: Newbie interested in mycology
Replies: 3
Views: 77

Re: Newbie interested in mycology

Mycology is very demanding of the microscope. So much of i.d'ing in mycology comes down to very subtle differences in gill structure, spore prints and ultimately very fine details of the spores themselves. You will need two microscopes. A stereo for perusing the gross details and a very good Bright ...
by apochronaut
Thu May 06, 2021 11:04 am
Forum: Microscopes and optics
Topic: Olympus SP x100 oil behaves strangely!! am I crazy ?
Replies: 7
Views: 126

Re: Olympus SP x100 oil behaves strangely!! am I crazy ?

Whether it is a light or a heavy viscosity oil would be irrelevant except based on chrisimbee's experience, a heavier oil might fill in the depressional area in the objective a little easier. As Rossf pointed out, some objective front lenses are depressional with a distinct concave profile, a necess...
by apochronaut
Wed May 05, 2021 9:51 pm
Forum: Microscopes and optics
Topic: Olympus SP x100 oil behaves strangely!! am I crazy ?
Replies: 7
Views: 126

Re: Olympus SP x100 oil behaves strangely!! am I crazy ?

Your arrow is pointing to the front lens of the objective, which depending on the objective, for a 100X oil immersion will be about 1 mm across + or -. Where is this hole, that you see : in the glass of the front lens or is the front lens possibly missing?
by apochronaut
Wed May 05, 2021 8:25 pm
Forum: Microscopes and optics
Topic: Optical Quality of inexpensive objectives
Replies: 18
Views: 982

Re: Optical Quality of inexpensive objectives

It has to do with the degree of lying a given government or overseeing international agency allows. Apparently we produce coffee and cocoa beans in Canada. I've looked amongst the apples and blueberries but the coffee bushes must really be shade grown because I have yet to find any.. You know what. ...
by apochronaut
Wed May 05, 2021 11:46 am
Forum: Camera systems and imaging
Topic: phototube/ Nikon DSLR adapter for AO Series 10
Replies: 3
Views: 101

Re: phototube/ Nikon DSLR adapter for AO Series 10

I don't think any of those are the best choice. If you go the telescope adapter route, you want one just like the microscope version in your second link, above. It has a T thread to the bayonet, so you will have to get a thin T to M42 adapter to put your helical focuser onto, then back to T for the ...
by apochronaut
Wed May 05, 2021 10:26 am
Forum: Microscopes and optics
Topic: AO Stereo Star Zoom 580 Help Needed
Replies: 11
Views: 249

Re: AO Stereo Star Zoom 580 Help Needed

I don't think the zoom has too many common optical parts between the 570 and 580. It is a 4.2X zoom compared to a 6X zoom. The upper lens is the one that moves to complete the zoom cycle to 6X, so it would likely have to be a more highly magnifying lens. I suppose it could do it by travelling farthe...
by apochronaut
Tue May 04, 2021 12:31 pm
Forum: Microscopes and optics
Topic: AO Stereo Star Zoom 580 Help Needed
Replies: 11
Views: 249

Re: AO Stereo Star Zoom 580 Help Needed

Probably. Look very carefully at the very bottom objective lens. You should see a lens with some threads exposed around the outside. The front lens is in fact cemented in. The threads are for a set ring that seats the upper lens, behind it. If the lower lens is missing, you will see a black set ring...
by apochronaut
Tue May 04, 2021 12:21 pm
Forum: Camera systems and imaging
Topic: phototube/ Nikon DSLR adapter for AO Series 10
Replies: 3
Views: 101

Re: phototube/ Nikon DSLR adapter for AO Series 10

The DX has a smaller APS-C type of sensor, and the camera body itself is a bit smaller, so it is probably your better choice. A full frame camera requires quite a bit more extension so the trinocular tube becomes a bit of a top heavy tower contributing to the already existing risk of excessive vibra...
by apochronaut
Mon May 03, 2021 2:42 pm
Forum: For forum members who want to buy and sell equipment
Topic: Cargille type B immersion oil
Replies: 4
Views: 187

Re: Cargille type B immersion oil

I'm sure you have found all the usual ones, so I won't send them , mainly because the stuff has become so expensive from the dealers. I have some I can send you at my cost which was pretty low, but it is actually older Leitz stuff, so I am unsure if it hits the button for viscosity compared to Cargi...
by apochronaut
Mon May 03, 2021 1:48 pm
Forum: Microscopes and optics
Topic: AO Stereo Star Zoom 580 Help Needed
Replies: 11
Views: 249

Re: AO Stereo Star Zoom 580 Help Needed

Anything rattle at all in the left mirror housing? The microscope is a pair of compound microscopes with a an air apaced doublet lens at the bottom and another compound lens in the head aperture, separated by a set of travelling lenses in the parallel zoom tracks. The bottom element is cemented in a...
by apochronaut
Sun May 02, 2021 2:46 pm
Forum: Microscopes and optics
Topic: AO Stereo Star Zoom 580 Help Needed
Replies: 11
Views: 249

Re: AO Stereo Star Zoom 580 Help Needed

There is a polarizer on a bracket for each optical tube that is in there . You can see it when you remove the trinocular cover plate. Maybe a ptoblem with one of those? However something looks odd between the two sides , like the lens elements are out of sync or one is missing on one side . The aper...
by apochronaut
Sun May 02, 2021 2:34 pm
Forum: Microscopes and optics
Topic: Optical Quality of inexpensive objectives
Replies: 18
Views: 982

Re: Optical Quality of inexpensive objectives

You may recognize a few features on the model below. Note the Made in India claim?? https://www.radicalindia.com/RXLr-5-MNX.php Wow, that is surprising to see. In another place, apochronaut and I were discussing this same scope, Chinese, sold by AccuScope (EXC-500) among other sources. Made in Chin...
by apochronaut
Fri Apr 30, 2021 2:35 pm
Forum: Microscopes and optics
Topic: Optical Quality of inexpensive objectives
Replies: 18
Views: 982

Re: Optical Quality of inexpensive objectives

Hard to say but somewhere they mention that the phase system is a Japanese Seiwa system. Probably the DIC is too because that is who makes their optics. There is no reason to believe that there would be anything wrong with it. The same microscope platform from a Chinese source sells the DIC for arou...
by apochronaut
Fri Apr 30, 2021 1:47 pm
Forum: My microscope
Topic: Feeling a bit lost (buying advice / Belgium)
Replies: 25
Views: 773

Re: Feeling a bit lost (buying advice / Belgium)

So you are talking about Belgian VAT, not U.K. VAT. In Canada. Shipped by mail ; hardly ever is there tax applied by customs. By courier, always and they fleece for import brokerage too. Correct, I meant Belgian VAT. It's a store so I don't have any say in the matter, I'm afraid. Koninklijk Antwerp...
by apochronaut
Thu Apr 29, 2021 10:27 pm
Forum: Microscopes and optics
Topic: Optical Quality of inexpensive objectives
Replies: 18
Views: 982

Re: Optical Quality of inexpensive objectives

I did a little research and it appears that Radical is using Seiwa/Correct optics. That is why their array of optics is so extensive compared to essentially the Chinese version of the same microscope.
by apochronaut
Thu Apr 29, 2021 9:08 pm
Forum: Microscopes and optics
Topic: Optical Quality of inexpensive objectives
Replies: 18
Views: 982

Re: Optical Quality of inexpensive objectives

Most of the cheaper DF oil condenser and 100X with iris sets for 160mm systems are Indian. They show up as add on kits from the jobbers, like Amscope. The Indian manufacturers and Chinese manufacturers seem to work together some , moving parts back and forth as needed. In the past Omax sold a lot of...
by apochronaut
Thu Apr 29, 2021 5:17 pm
Forum: My microscope
Topic: Feeling a bit lost (buying advice / Belgium)
Replies: 25
Views: 773

Re: Feeling a bit lost (buying advice / Belgium)

The seller should eat the paypal fees. So you are talking about Belgian VAT, not U.K. VAT. In Canada. Shipped by mail ; hardly ever is there tax applied by customs. By courier, always and they fleece for import brokerage too. Not similar in Belgium? Customs too busy to look at every package on the b...
by apochronaut
Thu Apr 29, 2021 5:10 pm
Forum: Home-made microscope adaptations
Topic: AO10 condenser filter slot / aux lens
Replies: 4
Views: 208

Re: AO10 condenser filter slot / aux lens

Actually, having the auxilary lens at the optical center is beneficial . It isn't as noticeable visually but for photography , it reduces a slight uneveness in the background given that the condenser struggles to fill the field. With the series 4. Very noticeable for phase contrast when using the 10...
by apochronaut
Thu Apr 29, 2021 3:06 pm
Forum: Home-made microscope adaptations
Topic: AO10 condenser filter slot / aux lens
Replies: 4
Views: 208

Re: AO10 condenser filter slot / aux lens

Some of them used a doughnut shaped cam as a stop. Loosening the screw allows you to rotate it for precise alignment of the optical center. I haven't checked on the screw size but probably the #2 are missing the cam?
by apochronaut
Thu Apr 29, 2021 3:00 pm
Forum: Microscopes and optics
Topic: Why are numerical aperture and color correction related?
Replies: 8
Views: 274

Re: Why are numerical aperture and color correction related?

Colour correction and resolution are quite independent factors in an objective but reduced levels of either or both interacts with the other, potentially overlapping and obscuring one another. An acceptable but not perfect analogy is the effect on the image of a coin in the bottom of a pool. The air...
by apochronaut
Thu Apr 29, 2021 1:33 pm
Forum: My microscope
Topic: Feeling a bit lost (buying advice / Belgium)
Replies: 25
Views: 773

Re: Feeling a bit lost (buying advice / Belgium)

Hi apochronaut, Yes, I'm totally new to this, you voiced my concerns quite well. If we're talking about the same MB.1653 offer there are some additional costs, unfortunately: £25: shipping ~€15: exchange rate fees €14.5: courier fees to handle customs (2% of the amount with a minimum of €14.5) loca...
by apochronaut
Wed Apr 28, 2021 11:46 am
Forum: My microscope
Topic: Feeling a bit lost (buying advice / Belgium)
Replies: 25
Views: 773

Re: Feeling a bit lost (buying advice / Belgium)

To me, 400 euros seems a little steep for a microscope at that level, but prices do differ in different parts of the world. I would normally be about the last person to suggest he go for a budget Chinese microscope but in his case a small glitch with a used one might be a deal breaker and there see...
by apochronaut
Wed Apr 28, 2021 11:23 am
Forum: Sandbox
Topic: questions about an AO Fifty Phase
Replies: 6
Views: 479

Re: questions about an AO Fifty Phase

An homage..... Since as you say, Fritz Zernicke invented phase contrast would it not be accurate then or in fact a better homage, to refer to Zernicke type phase contrast as a system that is similar in design and function to his original embodiment?
by apochronaut
Wed Apr 28, 2021 2:26 am
Forum: Sandbox
Topic: questions about an AO Fifty Phase
Replies: 6
Views: 479

Re: questions about an AO Fifty Phase

I'm still confused by what you mean by a "Zernicke Type" phase condenser , Pete. Just what exactly is that?
by apochronaut
Tue Apr 27, 2021 10:03 pm
Forum: Microscopes and optics
Topic: Proper combination of objective and eyepiece
Replies: 7
Views: 291

Re: Proper combination of objective and eyepiece

Coming from a bellow set up and used to direct projection I never understood this objective/eyepiece magnification combo; looks like a gimmick to improve sales to me. When taking pictures I normally I just specify magnification on sensor To me a 5X image is just that, a 5X no matter what camera I u...
by apochronaut
Tue Apr 27, 2021 2:40 pm
Forum: Microscopes and optics
Topic: Proper combination of objective and eyepiece
Replies: 7
Views: 291

Re: Proper combination of objective and eyepiece

the resolution available with low mag objectives often exceeds what can be seen with 10x eyepieces, so higher mag eyepieces can be usefully deployed. With high mag objectives the opposite occurs and you may be better using lower mag eyepieces. There are some qualifications to that. The main one is ...
by apochronaut
Mon Apr 26, 2021 11:09 pm
Forum: Microscopes and optics
Topic: Proper combination of objective and eyepiece
Replies: 7
Views: 291

Re: Proper combination of objective and eyepiece

The ideal combination can vary based on the user's criteria but there are some rules that must be followed, so the results are as ideal as possible and you don't stray into empty magnification or exceed the resolution limit of your eyes. The total magnification of any combination should always be be...