Search found 626 matches

by PeteM
Tue Oct 22, 2019 5:11 pm
Forum: Beginner's corner
Topic: Counterfeit detection
Replies: 2
Views: 74

Re: Counterfeit detection

FWIW, forensic comparison microscopes often show up used. These are basically two microscope bodies side by side, with a bridging head and prism that allows two near-identical images to be superimposed. Then something like the markings on two bullets (or two typewritten characters) can be compared t...
by PeteM
Mon Oct 21, 2019 11:37 pm
Forum: Beginner's corner
Topic: Am I doing something wrong?
Replies: 8
Views: 107

Re: Am I doing something wrong?

I'd head down to the creek and get some mucky samples to view. Bacteria are typically very small, and often transparent. They're hard to see. You should be able to check some cheek cells from inside your mouth and swab them on a slide, with a cover slip over. Helps if you have polarizers (usually ea...
by PeteM
Mon Oct 21, 2019 6:51 pm
Forum: Beginner's corner
Topic: Illuminator for Bausch and Lomb Phase Contrast Microscope
Replies: 5
Views: 78

Re: Illuminator for Bausch and Lomb Phase Contrast Microscope

It looks like you have the base lens and likely the mirror. The basic idea in LED replacements is to put the LED die (the bright bit) in the same position as the original tungsten filament. You might find a bright LED flashlight with either 3 brightness levels or a dimmer that will fit the hole at t...
by PeteM
Sun Oct 20, 2019 10:47 pm
Forum: Pictures and Videos
Topic: Sequoia gigantensis cross section in Epi-Fluorescence
Replies: 6
Views: 106

Re: Sequoia gigantensis cross section in Epi-Fluorescence

Great images (and story), Bob. Thanks.
by PeteM
Sun Oct 20, 2019 5:26 am
Forum: Beginner's corner
Topic: Focus distance
Replies: 6
Views: 98

Re: Focus distance

An affordable option might be a used industrial microscope of the sort used for wafer inspection -- with "epi" or through the lens illumination from above. Be sure it has objectives marked "LWD" or "ELWD" or equivalent for long working distance and extra long working distance. There are often marked...
by PeteM
Sat Oct 19, 2019 10:57 pm
Forum: Beginner's corner
Topic: Focus distance
Replies: 6
Views: 98

Re: Focus distance

You can buy long and extra long working distance objectives. It is typically best to use about 10x eyepieces and put the magnification in the objective. So, with a 10x and a 20x LWD (long working distance) objective you'd have 100x and 200x (and so on for higher powers). Note that while the working ...
by PeteM
Fri Oct 18, 2019 3:55 pm
Forum: Home-made microscope adaptations
Topic: Fixed TL and Infinity Inter-company Compatibly
Replies: 3
Views: 68

Re: Fixed TL and Infinity Inter-company Compatibly

One of the difficulties is that such a list would be subjective, unless some standard optical tests were included. One person might not be bothered, for example, by a mismatch of color correcting eyepieces and another would find it horrific. I've had good luck completely changing finite systems over...
by PeteM
Tue Oct 15, 2019 4:25 pm
Forum: Microscopes and optics
Topic: Mixed FN objectives on same head?
Replies: 7
Views: 125

Re: Mixed FN objectives on same head?

Interesting point, John, about the condenser and properly filling the field of view. I hadn't noticed that before, but I also don't pay much attention to the condenser markings (using visual adjustment). Have seen darkening of the edges in the reverse situation - when using a 22mm FN objective and l...
by PeteM
Tue Oct 15, 2019 1:43 am
Forum: Pictures and Videos
Topic: Stenostomum eats the ciliates
Replies: 7
Views: 161

Re: Stenostomum eats the ciliates

Cool video - thanks.
by PeteM
Tue Oct 15, 2019 1:42 am
Forum: Microscopy accessories
Topic: Leitz Condenser Help
Replies: 2
Views: 48

Re: Leitz Condenser Help

There are also two versions of Leitz condenser dovetails.

Since bare Leitz stands often show up frequently and affordably - and higher power darkfield condensers not so often or affordably - if you really want higher power darkfield maybe find the condenser first, then a stand to fit it??
by PeteM
Tue Oct 15, 2019 1:38 am
Forum: Microscopes and optics
Topic: Mixed FN objectives on same head?
Replies: 7
Views: 125

Re: Mixed FN objectives on same head?

Seems to me the only significant loss of installing an objective that's plan to 26.5mm to a 22mm head will be to your wallet.
by PeteM
Mon Oct 14, 2019 3:40 pm
Forum: Beginner's corner
Topic: Fusing glass slides
Replies: 23
Views: 841

Re: Fusing glass slides

A long shot, but sight glasses meant to check things like oil levels are made in hundreds of varieties. You might find some with a body resistant to your solvents and the glass portions sufficiently optically clear for the lasers. If so you machine a sort of valve body, threaded to take the glasses ...
by PeteM
Sat Oct 12, 2019 5:38 pm
Forum: Identification help
Topic: Amoeboid infected with parasites?
Replies: 7
Views: 577

Re: Amoeboid infected with parasites?

Wes wrote:
Sat Oct 12, 2019 8:27 am
I see three possibilities: food, gametes, parasites. . . Very mysterious object :?:
Pop rivets? Those critters may be smarter than we think :-)

Do agree that phase & brightfield to compare might help with an ID.
by PeteM
Sat Oct 12, 2019 6:25 am
Forum: Beginner's corner
Topic: Newbie with information overload looking for first microscope
Replies: 22
Views: 919

Re: Newbie with information overload looking for first microscope

Hope you and our kids have a blast.

There are several members here who run programs for kids -- so any thoughts you have on what interests your own kids, what difficulties they might have, how they use the photos they take, etc. etc. will be of interest.
by PeteM
Thu Oct 10, 2019 3:55 pm
Forum: Beginner's corner
Topic: AO 1036A Touch-Up Paint?
Replies: 5
Views: 370

Re: AO 1036A Touch-Up Paint?

Well, there you go. FWIW, the use of spray equipment to shoot two component epoxies was very rare here even after the late 70's. There were "epoxy modified" single shot paints. Now (for industrial metal stuff) both are largely replaced by powder coating. A solvent based enamel does fine for touchup ...
by PeteM
Thu Oct 10, 2019 3:45 pm
Forum: Beginner's corner
Topic: Newbie with information overload looking for first microscope
Replies: 22
Views: 919

Re: Newbie with information overload looking for first microscope

Some have a fixed annulus that inserts (one at a time) up into the condenser body. The only adjustment is to move the condenser off a bit and it is both limited in range and a pain to for what little tweaking is possible. The sliding types work, of course. What I like about the rotary dial types is ...
by PeteM
Thu Oct 10, 2019 3:37 pm
Forum: Beginner's corner
Topic: AO 1036A Touch-Up Paint?
Replies: 5
Views: 370

Re: AO 1036A Touch-Up Paint?

I'd guess, given the age, that the A.O. gray is an oil-based enamel with hardener (on edit, but defer to Apo's judgement above that it's an epoxy). FWIW, I've had decent luck mixing up my own touch up paints, starting with spray cans (mainly because they have relatively cheap small quantities). You ...
by PeteM
Thu Oct 10, 2019 4:53 am
Forum: Beginner's corner
Topic: Newbie with information overload looking for first microscope
Replies: 22
Views: 919

Re: Newbie with information overload looking for first microscope

One of the cool things about a Zernike type phase condenser is that it's usually possible to get decent oblique effects by rotating the phase stops out of position (so only a portion of a phase ring illuminates the specimen). Hatchna, hope you keep us posted on what your kids find interesting and if...
by PeteM
Tue Oct 08, 2019 7:53 pm
Forum: Microscopes and optics
Topic: Objective upgrade on Olympux CX23
Replies: 5
Views: 403

Re: Objective upgrade on Olympux CX23

If they won't unscrew by hand, get a non-marring strap wrench or pliers. They should unscrew relatively easily, same as the CX41.

What you won't likely have on the lower priced (but still pricey) CX23 is a removable nosepiece.
by PeteM
Tue Oct 08, 2019 6:12 pm
Forum: Microscopes and optics
Topic: Polarizing filter delamination?
Replies: 8
Views: 503

Re: Polarizing filter delamination?

My experience with delaminated polarizers (including some A.O.) is that they will often work well enough, as is, for casual observation and photography -- cool colors etc. Just keep them as far away as possible from a focal plane. I'll be interested if you have luck cleanly separating the three laye...
by PeteM
Tue Oct 08, 2019 4:54 am
Forum: Microscopes and optics
Topic: Polarizing filter delamination?
Replies: 8
Views: 503

Re: Polarizing filter delamination?

Certainly looks delaminated.

Try it - you may be satisfied with the image.

Seems you have three options: 1) Use it as is; 2) Return it; 3) Replace the polarizing element.
by PeteM
Mon Oct 07, 2019 8:54 pm
Forum: For forum members who want to buy and sell equipment
Topic: Microscope Accessories
Replies: 2
Views: 419

Re: Microscope Accessories

Prices?

On edit: just noticed Dublin as your location.
by PeteM
Mon Oct 07, 2019 5:14 am
Forum: Camera systems and imaging
Topic: Trinocular Modification for an Olympus CX31?
Replies: 17
Views: 939

Re: Trinocular Modification for an Olympus CX31?

The best setup, IMO, is an ergonomic binocular head (tilts to a comfortable height) on top with a U-TRU intermediate piece under it to hook to a camera. This is the most stable perch for a dedicated camera and the best possible ergonomics for viewing. As you suggest, even used it will likely cost ne...
by PeteM
Fri Oct 04, 2019 3:16 am
Forum: Beginner's corner
Topic: Newbie with information overload looking for first microscope
Replies: 22
Views: 919

Re: Newbie with information overload looking for first microscope

Just a note on Tiyoda. While they are well made (we have 3 of them), the 1950's optics lag behind most any top brand (Leitz, Nikon, Olympus, etc.) made from the 1970's on. True enough that for around $100-150 a Tiyoda could be a very good starter scope. I'd put an old American Optical 150 in that ca...
by PeteM
Wed Oct 02, 2019 11:50 pm
Forum: Beginner's corner
Topic: AO phase condensers
Replies: 7
Views: 216

Re: AO phase condensers

It's possible to machine either the dovetail or the carrier to allow the different dovetails to fit -- maybe an option for you? Don't know about the match up of phase rings.
by PeteM
Sat Sep 28, 2019 7:22 am
Forum: Pictures and Videos
Topic: euglenozoa
Replies: 12
Views: 384

Re: euglenozoa

Fantastic - thanks.
by PeteM
Thu Sep 26, 2019 11:53 pm
Forum: Microscopes and optics
Topic: Upgrading a Nikon E Plan PH3 Objective
Replies: 11
Views: 377

Re: Upgrading a Nikon E Plan PH3 Objective

I missed your post #5. Phil may very well have it. Not much depth of field at 40x and a higher NA objective is likely to make it even worse.
by PeteM
Thu Sep 26, 2019 11:12 pm
Forum: Microscopes and optics
Topic: Upgrading a Nikon E Plan PH3 Objective
Replies: 11
Views: 377

Re: Upgrading a Nikon E Plan PH3 Objective

Heather, a few thoughts: 1) Can I assume your phase telescope shows that the phase rings are perfectly aligned? Everything clean? Specimens under a cover slip? The E plan Nikon 40x should give a decent image. I've also had a bad example, used, with no obvious external damage. 2) On the condenser iri...
by PeteM
Wed Sep 25, 2019 5:12 am
Forum: For forum members who want to buy and sell equipment
Topic: UHL Rod Microscope
Replies: 11
Views: 353

Re: UHL Rod Microscope

From my limited experience, the linked Ebay dealer is happy to ship the worst and typically over-priced crap imaginable. In this case it looks like a decent scope, just way over-priced. As for your scope and as suggested above, a monocular single objective scope of that type, but from Gaertner, B&L,...
by PeteM
Tue Sep 24, 2019 5:10 pm
Forum: Introduce yourself
Topic: Retired now, and looking to obtain first scope for hobby use
Replies: 8
Views: 336

Re: Retired now, and looking to obtain first scope for hobby use

+1 more for a stereo microscope. You'll likely want one with a long working distance - something not all of the cheaper imports will have. A used microscope is good shape is likely your best value, but you will want to be able to see it in person or be sure you can easily return it if the lens are c...