Search found 3108 matches

by apochronaut
Thu May 21, 2020 2:21 pm
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Re: Evaluating potential microscope objective upgrades.

All good additions to the discussion, Michael.
by apochronaut
Thu May 21, 2020 12:31 pm
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Re: Evaluating potential microscope objective upgrades.

I can't do Zeiss but I can use a telan lens from the grandfather of all infinity systems going back to 1962: AO 34mm parfocal, also used by Reichert Austria from 1975 or so on for their short objective infinity microscopes. I have not photographed through one of those lenses used as a long focus len...
by apochronaut
Thu May 21, 2020 11:44 am
Forum: Microscopes and optics
Topic: Breaking the baffling B & L Balplan buffalo.
Replies: 32
Views: 3069

Re: Breaking the baffling B & L Balplan buffalo.

Welcome Balplan enthusiast. I think I have used an upload of yours in the past?? How strange that a Balplan enthusiast should pop up just at the time I start a thread about objective upgrades, since with the exception of effecting a complete overhaul of the optics , it is impossible to use another b...
by apochronaut
Wed May 20, 2020 11:09 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 565

Re: AO Triocular vs Beam Splitter

Without a crosshair objective or phase telescope , eyeballing is probably fine. First, get the objectives as parcentered in the nosepiece as much as possible. I try to get within 10 microns for the 100X but 20 or so is acceptable. Get the nosepiece centered by eyeballing from above as advised, then ...
by apochronaut
Wed May 20, 2020 10:37 pm
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Re: Evaluating potential microscope objective upgrades.

Could you post some unretouched comparative photos of some of these rearrangements? It would be educational for those looking to snag an inexpensive objective to make an upgrade with.
by apochronaut
Wed May 20, 2020 8:42 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 565

Re: AO Triocular vs Beam Splitter

So, take out your condenser , put the head back in and turn the illuminator on. Using the phase telescope, and a representative phase objective ( I use a 40X, as long as it is very well centered with the 100X....whichever one you have that is is best), look through it at the phase annulus. There wil...
by apochronaut
Wed May 20, 2020 8:20 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 565

Re: AO Triocular vs Beam Splitter

A centering of the ilumination system is critical to centering the entire system, if you don't have any additional tools like a phase telescope or a centering objective.
by apochronaut
Wed May 20, 2020 8:16 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 565

Re: AO Triocular vs Beam Splitter

Take off the head and looking down through the yoke, center the nosepiece visually. The length of the three screw thread sections can be used as a guide. Make them as equal as possible. The first order of business is to center the nosepiece to the optical tube. Everything else aligns to that. Do you...
by apochronaut
Wed May 20, 2020 8:05 pm
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Re: Evaluating potential microscope objective upgrades.

I use the term corrections rather loosely, because in essence all lenses introduce distortions or aberrations to the incoming light, even if the ultimate result is to cancel out those that it introduces. It would be interesting to see how a Mitutoyo, or Olympus or Nikon objective made it through th...
by apochronaut
Wed May 20, 2020 5:15 pm
Forum: Pictures and Videos
Topic: Clothes Moth
Replies: 10
Views: 1199

Re: Clothes Moth

When we moved to the 150 year old farm house almost 40 years ago, we put the piano in a corner covered in Hudson's Bay blankets. Many boxes were stacked in advance of the piano, until such time as we could get at them. So, until the next spring, little was seen of the piano. Upon getting close to it...
by apochronaut
Wed May 20, 2020 4:20 pm
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Re: Evaluating potential microscope objective upgrades.

That's true but there are adapters with which to use R.M.S. objectives on nosepieces that have metric threads of greater diameter and some to go the other way too. You can even adapt the old Jena 19mm thread up, to R.M.S. at least. This doesn't entail any great problem, really. The pitfalls could be...
by apochronaut
Wed May 20, 2020 10:52 am
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 565

Re: AO Triocular vs Beam Splitter

I neglected to point out that the effects on various objectives are not uniform. With the planapos for instance, probably due to their image circle being more homogeneously corrected , the malcorrections with the wrong telan lens introduces ca across the field, which increases in intensity with cove...
by apochronaut
Wed May 20, 2020 10:34 am
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Re: Evaluating potential microscope objective upgrades.

I use the term corrections rather loosely, because in essence all lenses introduce distortions or aberrations to the incoming light, even if the ultimate result is to cancel out those that it introduces. It would be interesting to see how a Mitutoyo, or Olympus or Nikon objective made it through the...
by apochronaut
Wed May 20, 2020 12:11 am
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 565

Re: AO Triocular vs Beam Splitter

It depends on which objectives , which eyepieces and which way one is swapping. Most of the 34mm show off axis ca with a 400 head and 181 eyepieces. The 40x .80 planapo without correction collar becomes particularly picky about it's cover slip thickness. Generally, the better corrected the objective...
by apochronaut
Wed May 20, 2020 12:02 am
Forum: Microscopes and optics
Topic: Evaluating potential microscope objective upgrades.
Replies: 22
Views: 341

Evaluating potential microscope objective upgrades.

By far the most economical way of improving one's microscope is to purchase objective lenses that have improved performance, when compared to the ones being currently used. Microscope companies usually offer several to a great many choices and the easiest way of making an improvement is to buy one o...
by apochronaut
Tue May 19, 2020 9:24 pm
Forum: Beginner's corner
Topic: Phase Contrast Condenser
Replies: 1
Views: 112

Re: Phase Contrast Condenser

Could you post something about the phase contrast filters you are referring to? Technical info., pictures?
by apochronaut
Tue May 19, 2020 1:02 pm
Forum: Microscopes and optics
Topic: Best way to assess condition of microscope objective optics?
Replies: 8
Views: 178

Re: Best way to assess condition of microscope objective optics?

I use a stereo with a transilluminator but offset somewhat, so the illumination is a bit oblique. Focus down through the elements one by one, as suggested.
If the light is direct , very slight de-lamination or more correctly cement haze, can be missed.
by apochronaut
Mon May 18, 2020 4:57 pm
Forum: Microscopes and optics
Topic: Difference between U S E objectives?
Replies: 6
Views: 169

Re: Difference between U S E objectives?

The Olympus printed information uses the word ultra to describe the U designation, whether it be ULWD or just U, where it indicates ultra transmission down to 340nm. There are lots of objectives designated for the UIS system(s) that have no U in the specs. The last Olympus rep I talked to , told me ...
by apochronaut
Mon May 18, 2020 11:59 am
Forum: Microscopes and optics
Topic: Difference between U S E objectives?
Replies: 6
Views: 169

Re: Difference between U S E objectives?

All of the objectives listed for the UIS work on the system but not all have a U designation in front . Only those with a U designation in front of the rest of the specification indicators show the capability for a greater working distance than others in the same class. I go back to the example give...
by apochronaut
Mon May 18, 2020 12:18 am
Forum: Microscopes and optics
Topic: Difference between U S E objectives?
Replies: 6
Views: 169

Re: Difference between U S E objectives?

Splan was a designation on 160mm tube length objectives and was an indicator of the objective having a greater f.o.v. up to 26.5mm . It means super wide field, as opposed to plan or Dplan, which had s standard field of up to 20mm. The S prefix doesn't seem to have been carried forward to the infinit...
by apochronaut
Sun May 17, 2020 5:09 pm
Forum: Microscopes and optics
Topic: Good priced 40x objectives?
Replies: 2
Views: 169

Re: Good priced 40x objectives?

What microscope is it for? You can't just put any infinity corrected objective on any microscope, although there is great compatability, sometimes. I know where you can get a 40X with a .75 aperture , Chinese plan fluor for 116.00 with free shipping. It is probably Motic compatable. I don't want to ...
by apochronaut
Fri May 15, 2020 10:02 pm
Forum: Microscopes and optics
Topic: AO Abbe Condensers-Microstar
Replies: 9
Views: 244

Re: AO Abbe Condensers-Microstar

still sounds like your condenser isn't locked into registration. When properly installed the little groove just under the iris diaphragm housing should be facing straight to the rear. When you install the condenser you have to wiggle it a bit sometimes and then it settles into registration by slippi...
by apochronaut
Fri May 15, 2020 5:09 pm
Forum: Microscopes and optics
Topic: AO Abbe Condensers-Microstar
Replies: 9
Views: 244

Re: AO Abbe Condensers-Microstar

Eyepieces are often designated for a specific system, and matched to certain objectives. With the series 10 , the only 10X eyepieces that should be used are # 177, # 176 or # 176A. They don't need to in the original heads. I don't remember eyepieces being part of your problems, it was condenser cent...
by apochronaut
Fri May 15, 2020 1:00 pm
Forum: Microscopes and optics
Topic: AO Abbe Condensers-Microstar
Replies: 9
Views: 244

Re: AO Abbe Condensers-Microstar

Actually, all microscope companies make lower end models with pre-centered condensers, not just AO. One of the reasons for this is in certain applications, it is actually a better design. In schools especially where multiple individuals are using the microscope, there would be various knob and screw...
by apochronaut
Fri May 15, 2020 1:47 am
Forum: Beginner's corner
Topic: Compatibility between PH objectives and condenser
Replies: 5
Views: 195

Re: Compatibility between PH objectives and condenser

If you are pretty boring and looking for predictable results then you have to stick to known functions between components. There is a lot of scope out there for some more radical designs though, so only through experiments will solutions be found. Some microscope companies retained their phase compo...
by apochronaut
Thu May 14, 2020 10:25 pm
Forum: Identification help
Topic: Fungal Spore?
Replies: 2
Views: 158

Re: Fungal Spore?

I farm, and am in my 40th year of doing so. I would like to say that Cercospora are my friends but they aren't. I use no synthetics and as what used to be asexually reproducing fungi meet far flung cousins and become sexual reproducers, those punk offspring are a handful.....literally, sometimes. Ce...
by apochronaut
Thu May 14, 2020 12:06 pm
Forum: Microscopes and optics
Topic: AO Abbe Condensers-Microstar
Replies: 9
Views: 244

Re: AO Abbe Condensers-Microstar

AO and the marketing moniker Reichert were quite modular from the introduction of the early 60's infinity microscopes( the student scopes and the 10) up until the last 410 or ATC 2000 was made branded Leica . Throughout the the years, the various scopes had various set ups , depending on how much yo...
by apochronaut
Thu May 14, 2020 12:39 am
Forum: Beginner's corner
Topic: What are the practical differences between trinocular light split settings when imaging? (E.g. 100:0 / 20:80)
Replies: 8
Views: 485

Re: What are the practical differences between trinocular light split settings when imaging? (E.g. 100:0 / 20:80)

One of the primary uses for the 20:80 image intensity split was as a patient-practioner or teacher-student tool. It kind of leaped from the use of the dual microscope or teaching microscope to the optical and screen set up to optical and video. In all of these , it really helps to have the illuminat...
by apochronaut
Wed May 13, 2020 1:36 pm
Forum: For forum members who want to buy and sell equipment
Topic: looking for condenser/diaphragm
Replies: 11
Views: 2542

Re: looking for condenser/diaphragm

A split collar should work.....so that it compresses when the screw is tightened. Probably a section of a tomato paste can would do. better would be to drill and tap the condenser yoke for 2 more thumb screws. You would get some benefit to be able to center the condenser some, with that mechanism. I...
by apochronaut
Wed May 13, 2020 1:22 pm
Forum: Microscopes and optics
Topic: (AO 20 series)Aligning the light path
Replies: 2
Views: 110

Re: (AO 20 series)Aligning the light path

Having a phase system is useful in aligning because you can use the bertrand lens to align what are essentially a series of circular ghost images, concentric with an annulus in an objective. You see this , every time you engage the bertrand lens and the nosepiece can be aligned while viewing the ann...