Search found 2941 matches

by apochronaut
Tue Mar 31, 2020 9:39 pm
Forum: Microscopes and optics
Topic: Questions about Reichert 420
Replies: 6
Views: 146

Re: Questions about Reichert 420

I am curious about your objectives. There was a 20X .50 planachro made for the Diastar and two 25X ; a .45 plan and a .65 planapo. I have never seen a 16X. Can you provide some details on this objective?
by apochronaut
Tue Mar 31, 2020 9:19 pm
Forum: Microscopes and optics
Topic: Vickers M17 refurb' & modification
Replies: 22
Views: 176

Re: Vickers M17 refurb' & modification

Thanks everyone for the kind words and encouragement. Sadly I have today discovered PWM generated strobe lines in a video I was editing, they are fine but noticeable. My initial testing was obviously not thorough enough, my apologies. I have edited the post to reflect this, back to the bench power ...
by apochronaut
Tue Mar 31, 2020 3:47 pm
Forum: Microscopes and optics
Topic: Vickers M17 refurb' & modification
Replies: 22
Views: 176

Re: Vickers M17 refurb' & modification

The most common Cooke-Baker and the later branded Vickers objectives, were the Microplans. That's their terminology for what some call Semi-Plan or Neoplan. The common eyepieces used with them were the Kellner 18mm f.o.v. It is a bit odd that the scope had the Compens eyepieces. Normally, those were...
by apochronaut
Tue Mar 31, 2020 2:38 pm
Forum: Microscopes and optics
Topic: Questions about Reichert 420
Replies: 6
Views: 146

Re: Questions about Reichert 420

Nice filter/mask holder. It is similar to the original aux. lens frame, so you should be able to use it for that too, in order to fill the field for the 2.5X. Can you not put a spacer under your swing out in order to clear the condenser fork? I put one on some time ago, and I recall needing to do th...
by apochronaut
Tue Mar 31, 2020 12:02 am
Forum: Microscopes and optics
Topic: Vickers M17 refurb' & modification
Replies: 22
Views: 176

Re: Vickers M17 refurb' & modification

A beautiful microscope, lovingly restored and upgraded somewhat. It even has a centering nosepiece. wow. Remarkable that many of it's brethren and others from other factories, ended up in dumpsters. Excellent work.
by apochronaut
Sun Mar 29, 2020 11:28 pm
Forum: Pictures and Videos
Topic: Olympus image of the year competition
Replies: 4
Views: 117

Re: Olympus image of the year competition

Köhler is a must, for certain contrast techniques and clearly makes the best of a bad situation , if one is stuck with an abbe condenser. However, this idea that it must be used , otherwise your microscopy is doomed to failure ignores a whole bunch of other factors that influence the illumination be...
by apochronaut
Sun Mar 29, 2020 9:33 pm
Forum: Microscopes and optics
Topic: Questions about Reichert 420
Replies: 6
Views: 146

Re: Questions about Reichert 420

If your condenser is a 1970, then it is a wide field 1.25 oil immersion abbe aspheric. It is very well corrected to the periphery, much better than an abbe. Used without oil it is about .90 N.A.. Those do require an aux. swing in condenser for use with the 2.5X. There is the lens in the frame, a sho...
by apochronaut
Fri Mar 27, 2020 12:30 pm
Forum: Microscopes and optics
Topic: Seeking selection advice for stereo microscope
Replies: 22
Views: 292

Re: Seeking selection advice for stereo microscope

Oddly, the SMZ-2T seems to typically sell for more than the SMZ-10 on eBay, but I think the 10 is actually a more advanced system. The 2T does have a higher max mag but the zoom range is the same so you can achieve about the same zoom range with 15x eyepieces on the 10. You do lose some field of vi...
by apochronaut
Fri Mar 27, 2020 12:24 pm
Forum: Microscopes and optics
Topic: Questions about Reichert 420
Replies: 6
Views: 146

Re: Questions about Reichert 420

That depends on which condenser you have. There were three possibilities. 1) a sealed unit wide angle 1.25 N.A. oil abbe aspheric cat.# 1970. This one does not have a filter slot. 2) a compound unit .90 N.A. achromat/aplanat cat.# 1201, threaded into a cat.# 1092 iris diaphragm housing. The 1092 iri...
by apochronaut
Fri Mar 27, 2020 11:56 am
Forum: Illumination Techniques
Topic: 100x objective funnel stop
Replies: 7
Views: 111

Re: 100x objective funnel stop

To work with your existing condenser and a dark field stop the aperture of the objective will have to reduced quite far, loosing lots of resolution. I would suggest the first get the dark field setup for the lower magnifications to work and continue with the 100:1 objective when you have located a ...
by apochronaut
Thu Mar 26, 2020 11:15 pm
Forum: Illumination Techniques
Topic: 100x objective funnel stop
Replies: 7
Views: 111

Re: 100x objective funnel stop

Funnel stops are very specifically designed and the aperture allowed for precise performance needs to be dead on. It would be hard to make a diy one that could remain centered as well, unless it could be threaded into the threads for the rear diaphragm of the objective. The factory versions were usu...
by apochronaut
Thu Mar 26, 2020 2:11 pm
Forum: Beginner's corner
Topic: Suspect OMAX Objectives?
Replies: 2
Views: 104

Re: Suspect OMAX Objectives?

Unfortunately, this bait and switch type of selling when it comes to on-line budget retailing of microscopes is not uncommon. The companies involved do not make microscopes, they have systems assembled by jobbers in China from parts sources that are often quite diverse. Years ago, in the early 90's ...
by apochronaut
Thu Mar 26, 2020 2:20 am
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 13
Views: 310

Re: 40x SPlan woes

It is always hard to tell what is wrong, when looking at pictures and videos where it seems that there is something wrong. The viewer isn't at the helm, so the standard methods to improve the image aren't available. Looking at your video, here is what I would do to improve your imaging. The first fe...
by apochronaut
Wed Mar 25, 2020 9:03 pm
Forum: Microscopes and optics
Topic: Seeking selection advice for stereo microscope
Replies: 22
Views: 292

Re: Seeking selection advice for stereo microscope

Does it have to be zoom? I'm sure you are aware that up until the last 20 years or so there were some compromises that had to be made in order to have a decent zoom range.While that may no longer be the case, the solution has not come without considerable cost. Any microscope under $3,000.00 or ther...
by apochronaut
Wed Mar 25, 2020 12:55 pm
Forum: Microscopes and optics
Topic: Frustration!
Replies: 59
Views: 9104

Re: Frustration!

Some people develop skills ; skills at observing , skills at asking the right questions and skills in dealing with ones oversight. If one adheres to that, then you have a very good chance of buying a used microscope, or any other used piece of equipment for a much lower cost than would be possible b...
by apochronaut
Wed Mar 25, 2020 12:33 pm
Forum: Miscellaneous
Topic: 1962 ad, perhaps of interest
Replies: 6
Views: 103

Re: 1962 ad, perhaps of interest

They didn't squint. I received a microscopy book as a present when I was very young. It was called The Microscope and How to Use it by Dr. by Georg Stehli. He was old school and clearly believed in a microscopist being a trained profession. He didn't even use a nosepiece, preferring rather to unscre...
by apochronaut
Tue Mar 24, 2020 4:48 pm
Forum: Pictures and Videos
Topic: Water mite stereo
Replies: 13
Views: 300

Re: Water mite stereo

Very beautiful little creature. Interestingly, I get it hollow with the second arrangement.
by apochronaut
Tue Mar 24, 2020 2:37 pm
Forum: Microscopes and optics
Topic: Strange apparatus on Leitz Orthoplan nosepiece?
Replies: 28
Views: 431

Re: Strange apparatus on Leitz Orthoplan nosepiece?

My guess is that it could be an indenter MichaelG. yes. pneumatic indenter does make sense. That port isn't a lens system. There is something up inside there, that looks metallic. Maybe it's an early tonometer???? ah hah ! The patient puts their head on the stage and that thing comes down, contacts...
by apochronaut
Tue Mar 24, 2020 1:13 pm
Forum: Pictures and Videos
Topic: Cicada says chin up everyone.
Replies: 7
Views: 189

Re: Cicada says chin up everyone.

Thanks. That is of interest to me too. Was, when used in literature devoted to species is seldom a good word. Cicadas are pretty transglobal. It's surprising that few are in the British Isles. The site Cicada Mania says that there are 190 species in N.A..... but not so many this far north. This part...
by apochronaut
Tue Mar 24, 2020 12:40 pm
Forum: Microscopes and optics
Topic: Strange apparatus on Leitz Orthoplan nosepiece?
Replies: 28
Views: 431

Re: Strange apparatus on Leitz Orthoplan nosepiece?

The objectives appear to be types of high magnification no cover objectives. One visible says 160X. Where the hose is connected , there is a large central screw supporting what looks to be the housing of some rotary device. Whatever that hose carries, it would seem that it is integral to the operati...
by apochronaut
Mon Mar 23, 2020 11:23 pm
Forum: Microscopes and optics
Topic: Strange apparatus on Leitz Orthoplan nosepiece?
Replies: 28
Views: 431

Re: Strange apparatus on Leitz Orthoplan nosepiece?

This is a vertically illuminated microscope. The head has .8X adapter for the Leitz epi or verically illuminated system. The hose looks to be a gas carrying hose; something to either warm or cool or even provide some other form of purge necessary to view whatever the materials the microscope was app...
by apochronaut
Mon Mar 23, 2020 10:54 pm
Forum: Microscopes and optics
Topic: Frustration!
Replies: 59
Views: 9104

Re: Frustration!

Leitzcycler wrote:
Thu Mar 05, 2020 8:31 pm
Perhaps this is a question of life strategy.
Which includes bad decision making. The problem of course has been identified as a problem with used microscopes in general, not the problem of which specific ones were purchased.
by apochronaut
Mon Mar 23, 2020 5:20 pm
Forum: Pictures and Videos
Topic: Cicada says chin up everyone.
Replies: 7
Views: 189

Re: Cicada says chin up everyone.

it was a 4x planachro with 20X offset phase diaphragm as a quasi DF stop.
by apochronaut
Mon Mar 23, 2020 4:28 pm
Forum: Pictures and Videos
Topic: Cicada says chin up everyone.
Replies: 7
Views: 189

Cicada says chin up everyone.

In these trying times it's nice to know that simpler creatures can be great guides. It is spring and I found this Cicada. The Cicada is dead and what in the picture appears as a stiff upper lip is actually a neck but what the hell. It's a Cicada and it's spring.
by apochronaut
Sun Mar 22, 2020 6:35 pm
Forum: For forum members who want to buy and sell equipment
Topic: Wanted: AO Cat. #1022 20x objective
Replies: 4
Views: 180

Re: Wanted: AO Cat. #1022 20x objective

The 1022 is a fine objective but it is only a snudge better than the 20X .50 #1077. It doesn't show up for sale much, either. There is one of those on ebay too, in a group with a couple of other objectives. With protozoa you won't notice much difference. ebay # 312851838919. .....50.00. AO initially...
by apochronaut
Fri Mar 20, 2020 1:11 pm
Forum: Microscopes and optics
Topic: AO one-hundred vs one-ten?
Replies: 12
Views: 4185

Re: AO one-hundred vs one-ten?

Yes. They used the 176A eyepieces , which are 18mm and had originally appeared in the series10 catalogues for use with the #1076-1079 achromat objective series. Seems like an odd design choice in retrospect. Why not use the 20mm # 180 eyepieces and set the microscope apart from Olympus, rather than ...
by apochronaut
Thu Mar 19, 2020 1:04 pm
Forum: For forum members who want to buy and sell equipment
Topic: looking for condenser/diaphragm
Replies: 6
Views: 972

Re: looking for condenser/diaphragm

The reason that the condenser needs to get as close to the slide as possible is that it is necessary for the condenser to work at the highest possible N.A. , with very high N.A. objectives. Your 54X Leitz objective will require the condenser to be quite close to the slide. If you do obtain an object...
by apochronaut
Thu Mar 19, 2020 12:52 am
Forum: Illumination Techniques
Topic: Phase Microscopy part II
Replies: 7
Views: 2751

Re: Phase Microscopy part II

Here are some pretty unpolished images but you can get the general idea. The subject is some species of Fragillaria, likely. These were under pretty high magnification . AO were the only mfg. of B -Minus phase and only made B -Minus in the infinity series of objectives as a 100X 1.25 achromat. I mad...
by apochronaut
Thu Mar 19, 2020 12:13 am
Forum: Microscopes and optics
Topic: Fluor vs Plan Fluor?
Replies: 6
Views: 613

Re: Fluor vs Plan Fluor?

Terms such as fluor , Fluor, F, fluorite, Fluorite , advanced achro or semi apo are meant to describe the degree of colour correction : basically how limited the chromatic aberration is . Although different manufacturers use differing designs, generally speaking the level of ca control is measured o...