Search found 3108 matches

by apochronaut
Tue May 12, 2020 10:27 pm
Forum: Beginner's corner
Topic: Hi I'm new and was thinking off buying a microscope
Replies: 7
Views: 254

Re: Hi I'm new and was thinking off buying a microscope

I have serviced a neighbour's microscope that keeps pigeons. It's a perfectly acceptable practice for pigeon fanciers to use a microscope to assess stool samples, and I have been told that many do.
by apochronaut
Tue May 12, 2020 6:14 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 566

Re: AO Triocular vs Beam Splitter

That's a series 4. There is no telan lens. Some use them for astro binoculars.
by apochronaut
Tue May 12, 2020 2:10 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

I can't recall, if I ever knew. Do you have a phase system and or a bertrand lens?
by apochronaut
Tue May 12, 2020 11:53 am
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 566

Re: AO Triocular vs Beam Splitter

Yes, it would be but they have a history. The beam splitting prism is prone to hazing after a period of use, which causes one side to have lower contrast and a little off colour compared to the other. Sometimes it isn't bad enough to be bothersome when the left and right images are blended but somet...
by apochronaut
Mon May 11, 2020 11:09 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 566

Re: AO Triocular vs Beam Splitter

The image circle doesn't cover an APS-C sensor. It might be o.k. with much smaller sensors. However, there is an undefined ( fuzzy) field stop with a kind of hazy border, coma and lateral ca . I don't remember exactly but I think there is curvature of field and loss of some planarity too. If you are...
by apochronaut
Mon May 11, 2020 10:14 pm
Forum: Camera systems and imaging
Topic: AO Triocular vs Beam Splitter
Replies: 30
Views: 566

Re: AO Triocular vs Beam Splitter

There are coatings on the prisms and they can always be damaged but of the 5 or so of similar ones I have had in my possession, all have been good.......However; the listing you have supplied says it has chips and de-lamination on one of the prisms, so I'd look towards one that is intact. You can us...
by apochronaut
Mon May 11, 2020 9:51 pm
Forum: Microscopy accessories
Topic: Stymied on the application of these
Replies: 3
Views: 243

Re: Stymied on the application of these

Phil, could it have been an attempt with a turret-based polarizing microscope? If the earlier pol scopes were one lens at a time, perhaps someone thought that a turret that could quickly be adjusted to center might have some value? Would likely have to be one of the earliest infinity scopes, if so,...
by apochronaut
Mon May 11, 2020 4:16 pm
Forum: Microscopy accessories
Topic: Stymied on the application of these
Replies: 3
Views: 243

Stymied on the application of these

I bought a small joblot of old AO parts, mostly due to the fact that I had never seen them before and they would also very useful. For older microscopes, 5 place nosepieces are always useful. I'm pretty sure these parts were used together because I can see a purpose for them but just why that purpos...
by apochronaut
Mon May 11, 2020 3:21 pm
Forum: Home-made microscope adaptations
Topic: AO-Reichert 1973A condenser DIY help request
Replies: 14
Views: 4674

Re: AO-Reichert 1973A condenser DIY help request

Well. I know it has been a lot longer than a few days but last night I tried to extract the lens pack from the examples I have of these. Without resorting to using a light press on the upper housing, they don't want to come out easily. Since the examples I have are all in good shape and functional, ...
by apochronaut
Mon May 11, 2020 12:07 pm
Forum: Illumination Techniques
Topic: DF NA requirements
Replies: 4
Views: 370

Re: DF NA requirements

Patch stops are limited in their capacity to enable really good DF. A 20X , even at .75 should give a good dark background. The only time I have run into problems with DF oil condensers is when the N.A. climbs above .80 . Where you may have problems is with the illumination circle. Some condensers, ...
by apochronaut
Mon May 11, 2020 1:51 am
Forum: Illumination Techniques
Topic: DF NA requirements
Replies: 4
Views: 370

Re: DF NA requirements

DF condensers produce a thick walled cone of light with an outer wall representing the higher N.A. limit and the inner wall representing the lower N.A. limit. They allow light of an N.A. between those two limits into the optical path. Generally speaking the upper limit determines the field coverage ...
by apochronaut
Sun May 10, 2020 11:39 pm
Forum: For forum members who want to buy and sell equipment
Topic: Advice on physician microscope
Replies: 8
Views: 594

Re: Advice on physician microscope

What branch of pathology do you work in?
by apochronaut
Fri May 08, 2020 6:14 pm
Forum: Miscellaneous
Topic: PVC and PET microplastics in caddisfly
Replies: 6
Views: 680

Re: PVC and PET microplastics in caddisfly

on the verge, as in it was in the public's mind, it was being talked about and actually , people were doing something about it but yes, it was and is far from having been acceptably targeted as the real menace that it is. A nationwide grocery chain here, from August to about mid. February, I don't r...
by apochronaut
Fri May 08, 2020 1:56 am
Forum: Miscellaneous
Topic: PVC and PET microplastics in caddisfly
Replies: 6
Views: 680

Re: PVC and PET microplastics in caddisfly

Very interesting study . We were on the verge of dealing with the plastic epidemic but the paranoia surrounding the current biological one has been and will continue to be a gold mine for the plastics industry, for some time to come. They now again have a reason to invade people's daily lives, not t...
by apochronaut
Wed May 06, 2020 9:46 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 865

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: 865

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: 865

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: 320

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: 865

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: 721

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: 776

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: 665

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: 708

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: 14138

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: 1671

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: 1671

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: 752

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: 1671

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: 14138

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: 1671

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...