Search found 6272 matches

by apochronaut
Wed May 06, 2020 9:46 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 5890

Re: objective nomenclature

The concept of plan , really is a variable one and entirely dependent on the f.o.v. NPl , probably implies planarity with a normal f.o.v., which is probably somewhere around 18mm. To achieve a wider field, with wider planarity, a whole different set of optics would be necessary. There is something e...
by apochronaut
Wed May 06, 2020 2:00 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 5890

Re: objective nomenclature

I suppose where they are just designated as NPlan that might be a question . In this case the catalogue explicitly says Neo Plan.
by apochronaut
Wed May 06, 2020 12:42 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 5890

Re: objective nomenclature

Looks like I will remain confused for a while longer ... I was hoping the inner truth had been revealed :( MichaelG. . Edit: Perhaps the best evidence might come from a price list !! I don't have a price list handy but I have seen one for the group of objectives listed for the AO/Reichert series 40...
by apochronaut
Tue May 05, 2020 10:48 pm
Forum: Camera systems and imaging
Topic: Using a ZWo ASI385MC with my American Optical 150
Replies: 2
Views: 1799

Re: Using a ZWo ASI385MC with my American Optical 150

There aren't any off the shelf quick solutions that were made for that microscope. All photography was done through a trinocular photo tube. You will need to diy a clamping mechanism to the eyepiece tube and then arrange adapters to afix the camera. Since the camera is used for astro photo purposes,...
by apochronaut
Tue May 05, 2020 6:07 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 5890

Re: objective nomenclature

There are numerous designations leading up to the plan designation and the plan designation is entirely dependent on which eyepiece the manufacturer has decided to rate the objective as plan with. NPl has also been linked with the term Neoplan, which is usually associated with a narrower field of vi...
by apochronaut
Mon May 04, 2020 11:10 am
Forum: Illumination Techniques
Topic: Leica Integrated Modulation Contrast (Variant of Hoffman)
Replies: 7
Views: 4351

Re: Leica Integrated Modulation Contrast (Variant of Hoffman)

This, Hoffman, the variable slit interference condenser of PZO, the Goerz condenser and the original Zernicke/Zeiss phase system all seem to be variations on a theme. That of passing the original light source through a slit, rather than than through a circular or concentric aperture. I suppose, one ...
by apochronaut
Sun May 03, 2020 2:07 pm
Forum: Microscopes and optics
Topic: Old Scope Who is the Maker?
Replies: 12
Views: 4641

Re: Old Scope Who is the Maker?

Small Japanese makers up until into the 80's were making stencil brands or house brands for scientific supply houses and customizing the colour and sometimes certain convertible components to the customer's budget and desires. Later in that period Korea got involved as the heir apparent cheaper supp...
by apochronaut
Fri May 01, 2020 1:32 am
Forum: Resources (online, books etc.)
Topic: Is it possible to observe cell wall synthesis under microscope
Replies: 2
Views: 3100

Re: Is it possible to observe cell wall synthesis under microscope

I would think it would be possible to a degree but you would be limited by the available high resolution capability of your system plus whether you could highlight certain structures without killing the subject. I am assuming you want to magnify the cell wall as much as is possible in order to view ...
by apochronaut
Wed Apr 29, 2020 1:27 pm
Forum: Microscopes and optics
Topic: In the market for new oculars, any suggestions?
Replies: 5
Views: 2625

Re: In the market for new oculars, any suggestions?

It just has to be a 10mm collar. I have a bunch of 5mm here, if you want to use 4.
by apochronaut
Wed Apr 29, 2020 11:16 am
Forum: Illumination Techniques
Topic: Dark field illumination: Questions and answers
Replies: 65
Views: 36216

Re: Dark field illumination: Questions and answers

There are usually subtle changes in the objectives made between about 1910 and 1960, even though the actual optical designs varied little. Mostly, the advent of anti-reflection coatings and very minor changes to internal design of the barrel reduced flare a little and increased contrast. If I had a ...
by apochronaut
Tue Apr 28, 2020 10:11 pm
Forum: Beginner's corner
Topic: Need advice buying a Reichert Microstar IV
Replies: 23
Views: 9081

Re: Need advice buying a Reichert Microstar IV

I have to guess here but it is based on a bit of fiddling with quite a few of these. The brass seat on the condensers I have partially separated ,are probably shims. They don't seem to come out easily and may be secured in place during the body assembly. I can see threads that look like the nose of ...
by apochronaut
Tue Apr 28, 2020 7:31 pm
Forum: Beginner's corner
Topic: Need advice buying a Reichert Microstar IV
Replies: 23
Views: 9081

Re: Need advice buying a Reichert Microstar IV

Pictures; good. The bottom lens drops out after you remove a retaining ring yes but the parts manual shows the entire lens section built as a unit with one part # 1970-860. They don't even list a part # for the bottom lens and retainer but they show 9 more part #'s for the rest of the entire condens...
by apochronaut
Tue Apr 28, 2020 4:37 pm
Forum: Illumination Techniques
Topic: Resolution comparison between BF, Oil DF and PhC
Replies: 7
Views: 3650

Re: Resolution comparison between BF, Oil DF and PhC

If you look up inside and see a small convex mirror, it is cardioid. It most likely is cardioid, since quality manufactuers were striving for the best possble resolution for DF, coupled to freedom from ca and if they only made one type, cardioid would likely be the choice. Some companies, Bausch & L...
by apochronaut
Tue Apr 28, 2020 3:06 pm
Forum: Beginner's corner
Topic: Need advice buying a Reichert Microstar IV
Replies: 23
Views: 9081

Re: Need advice buying a Reichert Microstar IV

1) Could you post a picture of the condenser? It does sound like someone has removed the iris and installed a blue filter. Very odd because the # 1970 condenser has a sealed optical section. Does it have any other distinguishing features? The 410 does not have an abbe condenser. It is an abbe aspher...
by apochronaut
Tue Apr 28, 2020 1:37 pm
Forum: Illumination Techniques
Topic: Dark field illumination: Questions and answers
Replies: 65
Views: 36216

Re: Dark field illumination: Questions and answers

Here are some photos, as well.
by apochronaut
Tue Apr 28, 2020 11:11 am
Forum: Beginner's corner
Topic: Need advice buying a Reichert Microstar IV
Replies: 23
Views: 9081

Re: Need advice buying a Reichert Microstar IV

No it isn't acceptable . If the item is returnable, then it is on the seller to pay the return shipping. There may be odd situations where the seller is willing to take back a fully functional item because the buyer either bought an incorrect item or something transpired that determined that it coul...
by apochronaut
Mon Apr 27, 2020 11:37 pm
Forum: Beginner's corner
Topic: Need advice buying a Reichert Microstar IV
Replies: 23
Views: 9081

Re: Need advice buying a Reichert Microstar IV

Ebay has a pretty reasonable policy regarding returns. People just neglect to utilize ebay's buyer protection. If the listing said fully functional or works as intended or tested and working or some such thing then it should be fully functional. If the listing says as is, or untested or has some wor...
by apochronaut
Mon Apr 27, 2020 11:34 am
Forum: Beginner's corner
Topic: X40,x60,x100 objective différence in use
Replies: 15
Views: 7931

Re: X40,x60,x100 objective différence in use

The role of the eyepiece was in the next blog article: http://bettermicroscopy.blogspot.com/2019/11/ That's why most of the older apochromat systems used a 15X eyepiece as a default, rather than a 10X. It is also why they used 2mm objectives rather than 1.8mm objectives. A 2mm objective gives appro...
by apochronaut
Mon Apr 27, 2020 3:04 am
Forum: Beginner's corner
Topic: X40,x60,x100 objective différence in use
Replies: 15
Views: 7931

Re: X40,x60,x100 objective différence in use

The blog is a continuation of one Dave Jackson has had for a while. It went into liimbo for a year or so. The current incarnation is apparently by a new blogger, whose initials are also DJ..... This index just says that you can expect a higher degree of performance from an objective with a high N.A....
by apochronaut
Sun Apr 26, 2020 9:53 pm
Forum: Beginner's corner
Topic: X40,x60,x100 objective différence in use
Replies: 15
Views: 7931

Re: X40,x60,x100 objective différence in use

One has always to factor in what they are actually doing with the sample. The original question was whether one should go for the highest or lowest magnification in the same brand and quality level , if the N.A. is the same. If the purpose of the observation is to make a photo, the answer is a littl...
by apochronaut
Fri Apr 24, 2020 6:59 pm
Forum: Microscopes and optics
Topic: Microscope advice!
Replies: 14
Views: 4257

Re: Microscope advice!

A Microstar or Diastar might be hard to find in Sweden. I think Reichert was very active there though, so you might consider one of the Reichert instruments that they probably sold there, which were of Austrian production. The one I would target would be a Diavar 2. It is very similar to Diastar, us...
by apochronaut
Fri Apr 24, 2020 2:24 pm
Forum: Microscopes and optics
Topic: Microscope advice!
Replies: 14
Views: 4257

Re: Microscope advice!

You keep overlooking Reichert infinity systems 75RR. Some of them are often very attractively priced and the optics are as good or batter than any.
by apochronaut
Fri Apr 24, 2020 11:25 am
Forum: Camera systems and imaging
Topic: (BH-2) Any solutions for widefield (26.5mm) photography?
Replies: 27
Views: 9384

Re: (BH-2) Any solutions for widefield (26.5mm) photography?

I'm not sure if you could adapt the principle to a fixed tube system. It might need some complicated optics and conversions. B & L did that in the Balplan, where they had a series of modified fixed tube objectives converted to infinity in a telescope lens system and then converted back to convergent...
by apochronaut
Fri Apr 24, 2020 10:29 am
Forum: Beginner's corner
Topic: Specimen ethics
Replies: 42
Views: 17474

Re: Specimen ethics

Actually, I haven't been wearing gloves, mask or washing my hands lately. I've been collecting any stray Sars 2 viruses manually and returning them to the environment they came from. People don't like me around here for some reason? I know they aren't supposed to be living but anything that can get ...
by apochronaut
Fri Apr 24, 2020 2:29 am
Forum: Illumination Techniques
Topic: Phase Microscopy part II
Replies: 11
Views: 9630

Re: Phase Microscopy part II

Unfortunately, mixing and matching phase diaphragms and annuli from different systems involves some trial and error, or hopefully finding someone who has travelled that road. I don't know Nikon well enough to be of much help. One way of possibly determining the cross compatibility between the S seri...
by apochronaut
Fri Apr 24, 2020 1:18 am
Forum: Illumination Techniques
Topic: Dark field illumination: Questions and answers
Replies: 65
Views: 36216

Re: Dark field illumination: Questions and answers

The iris works on any of the higher N.A. objectives above anout 60X.
by apochronaut
Fri Apr 24, 2020 1:17 am
Forum: Illumination Techniques
Topic: Dark field illumination: Questions and answers
Replies: 65
Views: 36216

Re: Dark field illumination: Questions and answers

I'm not exactly sure of the era of the objectives, probably from about the first W.W. to the early 50's but the design is a split shroud, with a lens section below a knurled ring and a blank section with rear baffle only above it. You unthread the baffle section and replace it with the iris as an ad...
by apochronaut
Thu Apr 23, 2020 5:16 pm
Forum: Beginner's corner
Topic: HELP!! Looking for a new microscope!
Replies: 17
Views: 6504

Re: HELP!! Looking for a new microscope!

I sent you some info but forgot to send the link. The second p.m. has the link. The third p.m. has more info. I think you picked up the first and third but the second one, the one that has the link is still in my outbox.
by apochronaut
Thu Apr 23, 2020 4:47 pm
Forum: Pictures and Videos
Topic: Amphipleura pellucida
Replies: 10
Views: 3602

Re: Amphipleura pellucida

That's a tricky one. Very good image of it. I remember doing these a few years back testing objectives and with a lot of 1.25 N.A. it was borderline whether they would reveal the striae in BF.
by apochronaut
Thu Apr 23, 2020 9:34 am
Forum: Camera systems and imaging
Topic: (BH-2) Any solutions for widefield (26.5mm) photography?
Replies: 27
Views: 9384

Re: (BH-2) Any solutions for widefield (26.5mm) photography?

With infinity optics you can use a teaching bridge as a photo tube and by pass the telan lens. With an adaptor for the dovetail on the bridge( same as the head) that has a thread on the other side to fit the filter thread of a prime lens , you can use a prime lens set at infinity, mounted vertically...