Search found 2756 matches

by apochronaut
Fri Dec 13, 2019 1:39 pm
Forum: For forum members who want to buy and sell equipment
Topic: AO - American Optical Series 20 (H20,H21) lamp
Replies: 4
Views: 85

Re: AO - American Optical Series 20 (H20,H21) lamp

I'd be interested in the lamp socket. I don't have a spare collector lens , though. Possibly many other items. There was a slight modification on those between the time they arrived on the scene in 1967 and the time they were superceded by the 120. You have to have the right one. Does yours have the...
by apochronaut
Thu Dec 12, 2019 5:23 pm
Forum: Beginner's corner
Topic: deep well microscope slides
Replies: 6
Views: 116

Re: deep well microscope slides

What kind of microscope are you using or more importantly what are the objective specifications you are using?
by apochronaut
Thu Dec 12, 2019 4:40 pm
Forum: For forum members who want to buy and sell equipment
Topic: Bausch & Lomb Type H, 1932-3...SOLD....
Replies: 10
Views: 2214

Re: Bausch & Lomb Type H, 1932-3...SOLD....

That was very well done. Circumstances like this one, often get missed...... great job of adding the microscope and Dr. Ozarin's contributions to public recognition.
by apochronaut
Tue Dec 10, 2019 6:52 pm
Forum: Home-made microscope adaptations
Topic: AO Starlite external Illuminator led retrofit.
Replies: 7
Views: 128

Re: AO Starlite external Illuminator led retrofit.

You are kind of right in that. Leds for microscopy stink in my opinion. Sure , one can trot out examples to the contrary; $10,000 microscopes that offer a more expensive led option, one or two diy set ups that might work o.k. or the possibilities with products from companies like Nichia. The thing i...
by apochronaut
Tue Dec 10, 2019 3:04 pm
Forum: Home-made microscope adaptations
Topic: AO Starlite external Illuminator led retrofit.
Replies: 7
Views: 128

Re: AO Starlite external Illuminator led retrofit.

11) The original bulb has a registration. The locking pins are situated at the apexes of an isosceles triangle, so that the two contacts are turned into the correct alignment with the contacts in the base. Removing the entire base, not just the flange, maintains the registration and the position of ...
by apochronaut
Tue Dec 10, 2019 2:40 pm
Forum: Home-made microscope adaptations
Topic: AO Starlite external Illuminator led retrofit.
Replies: 7
Views: 128

Re: AO Starlite external Illuminator led retrofit.

6) The two bulbs side by side. Clearly the headlamp base is much larger but the width and length of the the led section looks to be close to perfect. 7) The two bulbs separated. The glass envelope separated easily from the base of the 1460 bulb leaving the two wires intact. The led bulb 's method of...
by apochronaut
Tue Dec 10, 2019 1:55 pm
Forum: Home-made microscope adaptations
Topic: AO Starlite external Illuminator led retrofit.
Replies: 7
Views: 128

AO Starlite external Illuminator led retrofit.

The AO Starlite illuminator series is a ubiquitous stereo microscope illuminator series in North America. After 1985, they were branded Reichert, subsequent to the decision by AO's parent company , Cambridge Instruments , to carry the company into the future under that brand. It was also marketed el...
by apochronaut
Sun Dec 08, 2019 6:55 pm
Forum: Microscopes and optics
Topic: Inverted microscopes cant do this....
Replies: 10
Views: 319

Re: Inverted microscopes cant do this....

Yes. And the dishes are upwards of 5.00 each.
by apochronaut
Sun Dec 08, 2019 5:54 pm
Forum: My microscope
Topic: What model is my microscope ?
Replies: 5
Views: 199

Re: What model is my microscope ?

It is a Research # 5, made in 1952 or possibly 1953. The condenser is an odd one, having some of the features of the fine focus achromatic condensers usually mounted on one of those stands but carrying a more conventional abbe type condenser lens section. This must be one of the earlier single annul...
by apochronaut
Sun Dec 08, 2019 4:47 pm
Forum: Beginner's corner
Topic: Eyepieces different brightness
Replies: 3
Views: 97

Re: Eyepieces different brightness

If the microscope is a used one, sometimes they can spend some time sitting with one eyepiece out, allowing some dust to settle in on one of the upper prism surfaces or optical window.
by apochronaut
Fri Dec 06, 2019 7:47 pm
Forum: My microscope
Topic: What model is my microscope ?
Replies: 5
Views: 199

Re: What model is my microscope ?

That is either a #3 or a #5. It is a liitle hard to tell from the small photos. The #3 was the small research stand and the #5 was the larger research stand but they look very similar from a distance. It would be a little unusual for that model of circular stage to be mounted on a #3 but possible. F...
by apochronaut
Fri Dec 06, 2019 1:40 am
Forum: Microscopes and optics
Topic: Meaning of Red dot on a Leitz eyepiece?
Replies: 2
Views: 96

Re: Meaning of Red dot on a Leitz eyepiece?

Red dots or lettering have been used by some companies to indicate strain free for pol applications. I'm not sure whether a convention has developed but in the case of objectives; black barrels with red lettering or a dot is pol indicative.
by apochronaut
Fri Dec 06, 2019 1:36 am
Forum: My microscope
Topic: Just finished: tricked out cycloptic gemscope
Replies: 3
Views: 164

Re: Just finished: tricked out cycloptic gemscope

I have found that those B & L 15X U.W.F. eyepieces turn an economical Cycloptic into a stereo, much beyond it's presumed capability. There is a small amount of loss at the bottom end due to the 15X multiplier, which can be somewhat overcome by using a fractional objective. If a Chinese stereo existe...
by apochronaut
Wed Dec 04, 2019 2:48 pm
Forum: Microscopes and optics
Topic: Inverted microscopes cant do this....
Replies: 10
Views: 319

Re: Inverted microscopes cant do this....

There are a few ways that you can increase the depth of field and the depth of focus. 1) For some specimens, working at the maximum N.A. is not always necessary. The higher the N.A., the shallower is your depth of field. Lower N.A. objectives in most magnifications for many microscopes exist. Althou...
by apochronaut
Tue Dec 03, 2019 12:21 am
Forum: Microscopes and optics
Topic: Inverted microscopes cant do this....
Replies: 10
Views: 319

Re: Inverted microscopes cant do this....

The basic point of an inverted microscope , is that it removes the objective cluster from interfering with the specimen. This then allows larger specimens to be put on the stage as well as live specimens that have been grown in a culture or other aqueous medium. Specialized and sometimes quite large...
by apochronaut
Mon Dec 02, 2019 2:16 pm
Forum: My microscope
Topic: When You're Hot, You're Hot. Looky Here What I Got!
Replies: 7
Views: 327

Re: When You're Hot, You're Hot. Looky Here What I Got!

AO used Imperial measurements for most of their production, so I'm giving you the tube measurements in that system. It is probably only important with respect to the thread because the photo tube for the Series 2/4 is threaded into both of the trinocular heads that were available. The length of the ...
by apochronaut
Sun Dec 01, 2019 11:51 pm
Forum: Illumination Techniques
Topic: Darkfield for AO 570
Replies: 10
Views: 541

Re: Darkfield for AO 570

That works well. Pictures are pretty decent too.
by apochronaut
Sun Dec 01, 2019 9:14 pm
Forum: Introduce yourself
Topic: Hello. New to the Forums
Replies: 12
Views: 261

Re: Hello. New to the Forums

You can easily buy a a first rate used phase contrast microscope using a portion of your budget and then source out further components for the same scope extending it's capabilities, spending the rest up to your budget. $5,000.00 will get you a very good system and in fact also a good stereo microsc...
by apochronaut
Fri Nov 29, 2019 3:27 pm
Forum: My microscope
Topic: When You're Hot, You're Hot. Looky Here What I Got!
Replies: 7
Views: 327

Re: When You're Hot, You're Hot. Looky Here What I Got!

That is a good snag , Jim. The B & L objectives are pretty good; more contrasty than the contemporary Spencers but the Spencers have slightly better colour correction. Apochromats for that are pretty easy and cheap to find and there were some nice options in higher N.A. achromats and fluorites too. ...
by apochronaut
Thu Nov 28, 2019 2:51 am
Forum: My microscope
Topic: Manufacturer of this petrographic scope?
Replies: 7
Views: 1334

Re: Manufacturer of this petrographic scope?

The microscope is Japanese for sure. My guess would be that it might be one made for various retailers such as Lafayette and Edmund. Perhaps few enough were ordered that it didn't make sense to brand them and they may have simply been catalogued as a sort of house brand petrographic. In Japan , at t...
by apochronaut
Wed Nov 27, 2019 5:22 pm
Forum: Camera systems and imaging
Topic: Help attaching full frame DSLR to Olympus BX40
Replies: 19
Views: 510

Re: Help attaching full frame DSLR to Olympus BX40

These are all good recommendations but for the benefit of those reading this that are new to setting up a photo system, or for those finding a bargain 2 X photo eyepiece unbranded or from a different maker than their system, it may be important to note that whether any specific photo eyepiece or tub...
by apochronaut
Wed Nov 27, 2019 4:21 pm
Forum: Beginner's corner
Topic: Microscope selection question
Replies: 4
Views: 208

Re: Microscope selection question

I see that the Amscope U.S. site has the same model at $ 420.00, so about 380.00 €. and with only the 10X eyepieces included. On the other hand the U.K. site has the T490 B at 340.00 € right now. You never know with Amscope. Each day opens up a Hallowe'en bag. Regarding a 60X objective, I am assumin...
by apochronaut
Mon Nov 25, 2019 12:21 am
Forum: Beginner's corner
Topic: thinking out loud here - moral thoughts
Replies: 13
Views: 605

Re: thinking out loud here - moral thoughts

I used to have a small high end farm to table lunch bar in the core of T.O. , where I provided our farm foods, direct to the likes of buddhist petro bankers and meditating TSX mining stockbrokers. There was a "vegan" juice bar nearby within a fairly small space, so some of our more enlightened fares...
by apochronaut
Tue Nov 19, 2019 3:53 pm
Forum: Microscopes and optics
Topic: NF eyepiece
Replies: 2
Views: 104

Re: NF eyepiece

Normales Feld likely, as opposed to Gross Feld or GF eyepieces.
by apochronaut
Thu Nov 14, 2019 6:33 pm
Forum: Illumination Techniques
Topic: Darkfield for AO 570
Replies: 10
Views: 541

Re: Darkfield for AO 570

Since you have a glass stage plate, DF is possible but I don't know of any off the shelf set up for the AO 570. Essentially you would need the 561S transillumination or substage base and a ring illuminator larger than the port in the base plate. The ring illuminator would need to have pretty high wa...
by apochronaut
Tue Nov 12, 2019 1:24 pm
Forum: Microscopy accessories
Topic: AO parfocal camera tubes, formerly on ebay.
Replies: 1
Views: 467

AO parfocal camera tubes, formerly on ebay.

Some of you may have contemplated purchasing or have purchased one of the AO parfocal tubes that have been selling on ebay for many years. They have been made and sold for/by first one seller, then a different one. It is the same seller. He just thought a name change was due. I purchased several of ...
by apochronaut
Mon Nov 11, 2019 3:22 pm
Forum: My microscope
Topic: New microscope! AO Stereostar 570
Replies: 8
Views: 719

Re: New microscope! AO Stereostar 570

The convenience of one of AO's original illuminators should not be diminished. They fit snugly into their intended ports and are easy to use under the stage with the transillumination base for transmitted illumination and DF.They can be moved into almost an infinite number of positions in order to g...
by apochronaut
Mon Nov 11, 2019 12:19 am
Forum: Pictures and Videos
Topic: Mitosis in onion root tips
Replies: 23
Views: 2225

Re: Mitosis in onion root tips

This is very interesting and diligent work. I love the precise inquiry into methods to get better results and your stacks. Great for the forum . Helps take the entire website to a level it won't achieve without such input.
by apochronaut
Tue Oct 29, 2019 2:36 pm
Forum: Specimens, samples and slides
Topic: Disturbing occurrences lately
Replies: 9
Views: 1465

Re: Disturbing occurrences lately

Usually the contraction frequency of the contractile vacuole speeds up , prior to such events. Did this happen? There is in fact no cell wall , just a fragile cell membrane , with everything held together by a critical control of the internal osmotic pressure. As difficulty in regulating the osmotic...
by apochronaut
Wed Oct 23, 2019 7:49 pm
Forum: Microscopy accessories
Topic: Zero Working Distance Objective?
Replies: 5
Views: 912

Re: Zero Working Distance Objective?

The solution would therefore be your immersion medium. What is the n of your solution?