Search found 4117 matches

by apochronaut
Sun May 16, 2021 3:25 pm
Forum: Microscopes and optics
Topic: Achro vs. Plan Achro vs. Plan Apo stereo CMO objectives?
Replies: 4
Views: 101

Re: Achro vs. Plan Achro vs. Plan Apo stereo CMO objectives?

Pincushion distortion is easy to induce by messing around with eyepieces.
by apochronaut
Thu May 13, 2021 9:37 pm
Forum: Introduce yourself
Topic: Longtime lurker New User
Replies: 13
Views: 294

Re: Longtime lurker New User

There is a member on the forum who has a fully functional Univar.
by apochronaut
Thu May 13, 2021 1:15 am
Forum: Microscopes and optics
Topic: Coarse Focus Doesn't Turn
Replies: 10
Views: 176

Re: Coarse Focus Doesn't Turn

I don't know the "lab II" as well as others but there is a considerable shaft to bushing surface area on many microscopes, where lubricant can dry and lock things up. Moreso than in the actual mechanism. Getting some light penetrating type oil onto the shaft where it can work it's way into the inter...
by apochronaut
Wed May 12, 2021 10:25 pm
Forum: Introduce yourself
Topic: Longtime lurker New User
Replies: 13
Views: 294

Re: Longtime lurker New User

Very fine. Scope and image. Just for my own reference. That was with the 40X 1.0 oil planapo? Thanks Apochronaut, yes its the 40x PlanAPO Iris, its an incredible objectibve. I have the 100x PlanAPO Oeliris also, which is every bit as good. Heres a stack of a cymbella using 100x from a strew slide i...
by apochronaut
Wed May 12, 2021 7:18 pm
Forum: Introduce yourself
Topic: Longtime lurker New User
Replies: 13
Views: 294

Re: Longtime lurker New User

Very fine. Scope and image. Just for my own reference. That was with the 40X 1.0 oil planapo?
by apochronaut
Wed May 12, 2021 7:12 pm
Forum: Microscopes and optics
Topic: How much worse is the phase version of an objective for brightfileld
Replies: 11
Views: 224

Re: How much worse is the phase version of an objective for brightfileld

Phase condensers are optimized for use as a dry condenser when used for phase but can be also used dry or oil immersed for objectives with N.A.s greater than 1., if they also carry an N.A. greater than 1. For use with achromats or plan achromats, both in phase and BF, it sounds like your condenser i...
by apochronaut
Wed May 12, 2021 2:07 pm
Forum: Introduce yourself
Topic: Newbie and a question
Replies: 2
Views: 92

Re: Newbie and a question

Since you are interested in micrometeorites, the oil immersion objective might not be of that much use. Even a 60X is considerably more than you need. I assume though, that you will have other interests, that would benefit from a transmitted light microscope. For micrometeorites you need an incident...
by apochronaut
Wed May 12, 2021 1:11 pm
Forum: Microscopes and optics
Topic: How much worse is the phase version of an objective for brightfileld
Replies: 11
Views: 224

Re: How much worse is the phase version of an objective for brightfileld

I have pretty extensive experience using phase and BF in the same microscope. When one is looking to improve the detail of what they are seeing through the microscope, phase is a natural jump but it doesn't really make sense to make that jump for one objective magnification unless you happen upon a ...
by apochronaut
Wed May 12, 2021 12:21 pm
Forum: Microscopes and optics
Topic: Leica DM questions
Replies: 7
Views: 210

Re: Leica DM questions

There is probably a manual on-line, that should give you some guidance or more than likely you can download one from Leica Microsystems. Regarding the prism combinations. Perhaps a D2 for the 100X. I have never encountered a 1.63 N.A. objective. Objectives of over 1.6 N.A. have been made going way b...
by apochronaut
Wed May 12, 2021 1:00 am
Forum: Pictures and Videos
Topic: Most of the Weed
Replies: 2
Views: 65

Re: Most of the Weed

At first I thought this must be an explanation for the past few month's posts but it is in fact Botany.
by apochronaut
Tue May 11, 2021 7:19 pm
Forum: Microscopes and optics
Topic: SWIFT SW350B vs SW380B
Replies: 4
Views: 263

Re: SWIFT SW350B vs SW380B

You're right. There was some hunching going on. In fact I am hunching over this tablet, right now. Indian objectives were mostly distinctively brushed chrome but recently many of them look just like certain Chinese objectives or knockoffs of Nikon. Searching some items on ebay, I see that certain on...
by apochronaut
Tue May 11, 2021 12:01 pm
Forum: Microscopes and optics
Topic: SWIFT SW350B vs SW380B
Replies: 4
Views: 263

Re: SWIFT SW350B vs SW380B

The Asian hobby to mid level microscope industry is component based and very integrated, with the components being moved all over the place, allowing marketers to dovetail production to their market. Once a particular component outprices itself, it is replaced with one that can be produced more effi...
by apochronaut
Mon May 10, 2021 9:27 pm
Forum: Microscopes and optics
Topic: Are these any good as a portable out in the field diatom microscope?
Replies: 3
Views: 142

Re: Are these any good as a portable out in the field diatom microscope?

No. That is a Bausch & Lomb Academic microscope rebranded Leica after the merger. The older B & L ones were pale blue and green. A lot were sold for use in the lower primary grades. They worked well but had only a 100X magnification and a push pull focus.
by apochronaut
Mon May 10, 2021 1:48 pm
Forum: Microscopes and optics
Topic: The argument for plan.
Replies: 6
Views: 257

Re: The argument for plan.

With a 2000 micron field, a standard 10X microscope objective will provide somewhat less than 60% of the field with a flat image, in most cases. In fact field curvature begins to occur quite quickly, once you move away from the optical axis. Only about 35% of the center of the field is truly in focu...
by apochronaut
Mon May 10, 2021 1:11 pm
Forum: Microscopes and optics
Topic: Spring loaded objective
Replies: 20
Views: 367

Re: Spring loaded objective

I have had quite a few objectives of a similar or parallel design apart but not this very one. Still, the causes of a stuck or sticking cylinder have always been one of five possibilities at least that I have seen. 1) The machining is a bit rough or crude and there is/are sufficient points of fricti...
by apochronaut
Fri May 07, 2021 2:01 pm
Forum: Camera systems and imaging
Topic: phototube/ Nikon DSLR adapter for AO Series 10
Replies: 5
Views: 246

Re: phototube/ Nikon DSLR adapter for AO Series 10

The helical focuser actually doesn't do much in the way of focusing. What it does is adjust the extension tube so you can adjust the size of your image circle. My preference is to get the image circle just outside of the sensor frame, so I am capturing exactly what the eyepieces are seeing. I move t...
by apochronaut
Fri May 07, 2021 3:14 am
Forum: Introduce yourself
Topic: Newbie interested in mycology
Replies: 4
Views: 252

Re: Newbie interested in mycology

Of course there is nothing wrong with brand names but the attachment to them and obsession with them can waste a lot of money needlesly, money that could be used for needed supplies , add accessories to build a better system or just buy a better system outright. Second hand big 4 microscopes, except...
by apochronaut
Thu May 06, 2021 9:32 pm
Forum: Microscopes and optics
Topic: Olympus SP x100 oil behaves strangely!! am I crazy ?
Replies: 9
Views: 329

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: 17
Views: 383

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: 4
Views: 252

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: 9
Views: 329

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: 9
Views: 329

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: 1180

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: 5
Views: 246

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: 13
Views: 414

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: 13
Views: 414

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: 5
Views: 246

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: 235

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: 13
Views: 414

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: 13
Views: 414

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...