Search found 4319 matches

by apochronaut
Sun Jul 25, 2021 5:53 pm
Forum: Microscopes and optics
Topic: Bulb replacement
Replies: 4
Views: 89

Re: Bulb replacement

There are are halogen bulbs that look similar, fit the same socket and are rated for the same voltage and wattage. Their differences lie in two specifications. Light output measured in lumens and physical orientation. Bulbs have different filaments, so even if the wattage consumed by two bulbs is th...
by apochronaut
Thu Jul 22, 2021 6:23 pm
Forum: Microscopes and optics
Topic: Are there low-power oil immersion objectives?
Replies: 26
Views: 829

Re: Are there low-power oil immersion objectives?

Vickers will have to wait a little more... got instead two "for parts" Lomo Water immersion, 30x 0.90 and 85x 1.0 The 30x is really what I was looking for, works well in temporary water mounts of pond critters; can "dive" and focus through 1mm or so of water. Very practical. I'll try if work decent...
by apochronaut
Thu Jul 22, 2021 5:00 pm
Forum: Microscopes and optics
Topic: Please advise, please offer comments on objective lens etched specs ed specs
Replies: 13
Views: 265

Re: Please advise, please offer comments on objective lens etched specs ed specs

Cooke and later Vickers objectives followed that pattern. 100X 1.3 I have seen and I have a 40X 0.7 in my hand right now. There were no baseball games affecting production in York, England! At least they put the 0 and decimal on there, otherwise someone would be looking for viruses with that objecti...
by apochronaut
Wed Jul 21, 2021 1:58 am
Forum: Microscopes and optics
Topic: Please advise, please offer comments on objective lens etched specs ed specs
Replies: 13
Views: 265

Re: Please advise, please offer comments on objective lens etched specs ed specs

It was probably made on a Friday. The etchers were itching to take in some pitching, so knocked off early. The invincible Seibu Lions were in town to take on the Tokyo Yakult Swallows.
by apochronaut
Mon Jul 19, 2021 11:33 am
Forum: Beginner's corner
Topic: Resoloution and Light Wavelengths
Replies: 37
Views: 596

Re: Resoloution and Light Wavelengths

You have to remember that the divisions in the eyepiece are in the eyepiece and magnified only by the eyelens. They have no effect on what is being magnified. While it is theoretically possible to resolve down close to .2 microns or so with very excellent optics and illumination, even less using som...
by apochronaut
Mon Jul 19, 2021 1:42 am
Forum: My microscope
Topic: AO One-Fifty Phase
Replies: 14
Views: 674

Re: AO One-Fifty Phase

The 150 was a student microscope at a low price. It had the rather extreme advantage for it's day of being able to utilize the unique and innovative infinity corrected optical system that AO introduced close to 25 years in advance of it's competitors.That's why so many of them were sold and why anyo...
by apochronaut
Sun Jul 18, 2021 10:10 pm
Forum: Microscopes and optics
Topic: Strange Bedfellows
Replies: 8
Views: 269

Re: Strange Bedfellows

The objective is the one that Viktor pictured. None of them have CF on the barrel that I have seen. Maybe later ones did. The literature promotes that idea but as an objective series, the CF series. I have no doubt that Nikon like other manufacturers has spent a good deal of money on improving the c...
by apochronaut
Sun Jul 18, 2021 3:45 pm
Forum: Microscopes and optics
Topic: Strange Bedfellows
Replies: 8
Views: 269

Re: Strange Bedfellows

[media][/media] Huh, that's very cool! I wonder if the reverse works too. One of the confusing things about this unusual coherence is that the 160mm objectives are not designed to require a telan lens. However, clearly the Austrian Reichert infinity objectives must have one in order to focus an imag...
by apochronaut
Fri Jul 16, 2021 4:04 pm
Forum: My microscope
Topic: AO One-Fifty Phase
Replies: 14
Views: 674

Re: AO One-Fifty Phase

There are relatively fewer of them around than the 150 and it was a unique last stab at 160mm optics before they jumped wholesale into the infinity corrected 34mm system. However, it was their flagship instrument for about 5 years, so many were used in labs and some research because the system was q...
by apochronaut
Fri Jul 16, 2021 2:19 pm
Forum: My microscope
Topic: AO One-Fifty Phase
Replies: 14
Views: 674

Re: AO One-Fifty Phase

The 150 was an excellent student scope for it's era. Probably it's only defect is the illuminator which lacks sufficient controls. As a starter microscope, especially if one is considering phase, it is hard to beat but it is also hard to determine whether it or the series 4 is a better bet. Both com...
by apochronaut
Fri Jul 16, 2021 11:09 am
Forum: Microscopes and optics
Topic: Strange Bedfellows
Replies: 8
Views: 269

Strange Bedfellows

I have read from several users that Nikon 160mm D.I.N. objectives work well on an infinity corrected AO/Reichert series 400 scope. This always seemed odd to me but one of the reports came from someone that I have no reason to doubt and the particular objective were used for 20X D.I.C. too. I should ...
by apochronaut
Wed Jul 14, 2021 1:22 pm
Forum: Microscopy accessories
Topic: Need help to rectify this issue with imaging
Replies: 19
Views: 955

Re: Need help to rectify this issue with imaging

You have to search flocking roll, othrwise you get other stuff. something like this. https://www.ebay.com/itm/373133229400?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20201210111314%26meid%3D6d05ea253a9d4208b2273861b4b32e07%26pid%3D101195%26rk%3D1%26rkt%3D12%26sd%3D384222738702%...
by apochronaut
Wed Jul 14, 2021 1:13 pm
Forum: Microscopes and optics
Topic: Strange flare in Nikon CF N plan apo 20/0.75 objective
Replies: 26
Views: 591

Re: Strange flare in Nikon CF N plan apo 20/0.75 objective

The flare returns if I reinstall either the analyzer assembly or epi-illuminator, but it seems worst when both analyzer assembly and epi-illuminator are in place. This suggests that spherical aberration may be a partial culprit. Using a tube length that is 40 or 50mm longer than designed for can't ...
by apochronaut
Wed Jul 14, 2021 11:20 am
Forum: Microscopes and optics
Topic: How to unstick correction collar on objective?
Replies: 8
Views: 261

Re: How to unstick correction collar on objective?

It can't be stressed too much that no oil is better than just a drop too much. There is a very old thread very similar to this one and the poster got it in mind that just another drop and then just another drop would make the ring rotate easier. Oil ended up in the lenses, because it was being fed i...
by apochronaut
Wed Jul 14, 2021 1:21 am
Forum: Beginner's corner
Topic: Objective Cleaning With Water
Replies: 6
Views: 260

Re: Objective Cleaning With Water

You might be asking related to your new 60 mm parfocal Chinese objectives. I have some of those, so I will gladly sacrifice one and test IPA out for you. No need to put any equipment at risk for me. I'm only interested as a matter of general best practice on any microscope (objectives, eyepieces, o...
by apochronaut
Wed Jul 14, 2021 12:29 am
Forum: Beginner's corner
Topic: Objective Cleaning With Water
Replies: 6
Views: 260

Re: Objective Cleaning With Water

I would agree in the case of pure ethanol but not isopropyl. Firstly, for older uncoated optics , they are pretty impervious to to just about anything , so I wouldn't worry too much about alcohols. When it comes to coatings, maybe some of the softer internal coatings of the past might be sensitive t...
by apochronaut
Tue Jul 13, 2021 6:54 pm
Forum: Beginner's corner
Topic: Objective Cleaning With Water
Replies: 6
Views: 260

Re: Objective Cleaning With Water

Easiest way is to use isopropyl alcohol and cotton swabs. I use clean swabs to occasionally dust off the front lens . One end with a little bit of alcohol to clean the lens and the other end to dry it, then I use the same wet end with a bit more IPA on it to clean the objective body and the other en...
by apochronaut
Tue Jul 13, 2021 2:26 pm
Forum: Microscopy accessories
Topic: Can one adjust a condenser dovetail?
Replies: 17
Views: 300

Re: Can one adjust a condenser dovetail?

The d.i.y. apochromat that I made up has the least colour fringing of all the condensers tested above. It has the poorest performance of them all, and only the best with water because the others are not that good. I'm not sure where the degree of dispersion occurring at the field diaphragm fits in. ...
by apochronaut
Tue Jul 13, 2021 2:03 am
Forum: Microscopy accessories
Topic: Can one adjust a condenser dovetail?
Replies: 17
Views: 300

Re: Can one adjust a condenser dovetail?

No condenser can be over an N.A. of 1.0 without an immersion medium. Nikon are good optical designers not wizards.
by apochronaut
Mon Jul 12, 2021 10:23 pm
Forum: Microscopy accessories
Topic: Can one adjust a condenser dovetail?
Replies: 17
Views: 300

Re: Can one adjust a condenser dovetail?

None of the condensers immersed in water were that good but my objective was a 1.3 N.A. plan fluor , so it demanded a well corrected light source with sufficient N.A. Water's n is just over 1/2 way between air and immersion oil , so it probably reduces the N.A. of the condenser considerably, plus de...
by apochronaut
Mon Jul 12, 2021 8:13 pm
Forum: Identification help
Topic: Did I find a fossil of a ciliate? Answer: Ostracod fossil
Replies: 5
Views: 192

Re: Did I find a fossil of a ciliate?

Stentors are quite large, easily seen with the naked eye. I found a fossilized kiwi fruit under the fridge once. It had cilia.
by apochronaut
Mon Jul 12, 2021 8:08 pm
Forum: Microscopy accessories
Topic: Can one adjust a condenser dovetail?
Replies: 17
Views: 300

Re: Can one adjust a condenser dovetail?

Not yet, but I will, more frequently I'll use a drop of water on there. I think I need to make a 3D printed part that holds this rigidly to replace this dovetail kludge. Having lateral play is a bit of a pain as the condenser often moves when I am adjusting it's diaphragm. I can use it right now, b...
by apochronaut
Mon Jul 12, 2021 6:09 pm
Forum: Identification help
Topic: Did I find a fossil of a ciliate? Answer: Ostracod fossil
Replies: 5
Views: 192

Re: Did I find a fossil of a ciliate?

How big is this thing? Those hairs that show up in the last picture . Those are rigid and static, like little rock protuberances from the main body?
by apochronaut
Mon Jul 12, 2021 4:03 pm
Forum: Microscopes and optics
Topic: How to unstick correction collar on objective?
Replies: 8
Views: 261

Re: How to unstick correction collar on objective?

Having repaired more than 10 such objectives successfully and failing on a few, my rule of thumb is to remove the rotating ring, skirt or collar first, in order to get an idea of the way the mechanism works. Most of them are very similar but the way the collar comes off is different. The collar need...
by apochronaut
Mon Jul 12, 2021 1:15 pm
Forum: Microscopy accessories
Topic: Can one adjust a condenser dovetail?
Replies: 17
Views: 300

Re: Can one adjust a condenser dovetail?

Are you using the 1.4 condenser oiled?
by apochronaut
Mon Jul 12, 2021 12:50 am
Forum: Microscopy accessories
Topic: Can one adjust a condenser dovetail?
Replies: 17
Views: 300

Re: Can one adjust a condenser dovetail?

Sometimes dovetails can be removed but your pictures don't show enough detail.
I see that you are using a .90 condenser. Did you not get an oil condenser with the DIC or is that still in transit?
by apochronaut
Sun Jul 11, 2021 4:58 pm
Forum: Specimens, samples and slides
Topic: Does canada balsam dry clear/colourless?
Replies: 6
Views: 225

Re: Does canada balsam dry clear/colourless?

Hi, Canadabalsam is not a precisely defined substance so it will vary. Usually it is a little yellowish, which is not a problem in use. Ethanol is hygroscopic and the etanol thinned Canadabalsam will be cloudy because of the water. Orange peel oil might be usable but it is probably impossible to de...
by apochronaut
Sun Jul 11, 2021 3:00 pm
Forum: Microscopes and optics
Topic: Long working distance
Replies: 3
Views: 141

Re: Long working distance

Sometimes called a shop microscope or inspection microscope too. AO had a peculiar one that comes off as a bit of a Cycloptic/series 10 hybrid. It has a cycloptic style rotating single objective drum changer body with a series 10 binocular head mated to it. The drum changer is unique though, not jus...
by apochronaut
Fri Jul 09, 2021 2:02 am
Forum: For forum members who want to buy and sell equipment
Topic: Wanted: 0.5 Barlow lens for AO 569 stereoscope
Replies: 14
Views: 233

Re: Wanted: 0.5 Barlow lens for AO 569 stereoscope

That's a good start. How does the .5X barlow fit into the picture?
by apochronaut
Thu Jul 08, 2021 10:48 pm
Forum: For forum members who want to buy and sell equipment
Topic: Wanted: 0.5 Barlow lens for AO 569 stereoscope
Replies: 14
Views: 233

Re: Wanted: 0.5 Barlow lens for AO 569 stereoscope

If you use a barlow. You can clamp your ringlight directly onto that but obviously will need the 577 blank otherwise. There are two incarnations of the M48X .75 barlows available. https://www.ebay.com/itm/273469486556?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D233036%26meid%3D2...