Search found 252 matches

by wporter
Mon Sep 23, 2019 10:10 pm
Forum: Digital processing
Topic: Change lighting on laptop
Replies: 5
Views: 343

Re: Change lighting on laptop

Fn-F6 to lower, Fn-F7 to brighten does not work? Sometimes there is a delay until the actual change...
by wporter
Thu Sep 12, 2019 6:06 pm
Forum: Microscopes and optics
Topic: B&L Balplan/Microzoom II light path selector
Replies: 9
Views: 920

Re: B&L Balplan/Microzoom II light path selector

That is a mounting point for one end of a toggle spring, that provides the two positive setpoints for the prism position, i.e., in the light path or out of the light path. Yours is missing, which is OK, as the lever and prism will still work; they just aren't held in the in or out position very well...
by wporter
Thu Sep 12, 2019 1:39 am
Forum: Microscopes and optics
Topic: B&L Balplan/Microzoom II light path selector
Replies: 9
Views: 920

Re: B&L Balplan/Microzoom II light path selector

No, just a prism moves with the lever.

Where exactly is this threaded boss?
by wporter
Mon Sep 09, 2019 3:25 pm
Forum: Identification help
Topic: Is this real?
Replies: 11
Views: 1970

Re: Is this real?

Floaters should be easy to distinguish from other FOV phenomenon. If you jerk your eye's point-of-focus to the side, the typical floater should lag a bit, i.e., not move as much as the jerk, but after a second or so, "catch up", and slide back to near the center of the field (at least the especially...
by wporter
Sat Sep 07, 2019 2:03 am
Forum: Beginner's corner
Topic: immersion oil question
Replies: 9
Views: 517

Re: immersion oil question

I would think that the oil, especially if it eventually spreads out to form a sheen or layer, would probably negatively impact the air-water gaseous exchange rate or process.
by wporter
Sat Sep 07, 2019 1:45 am
Forum: For forum members who want to buy and sell equipment
Topic: Zeiss Universal for sale
Replies: 8
Views: 730

Re: Zeiss Universal for sale

The protrusion is a 3-layer slide holding multiple filters.
by wporter
Wed Jun 26, 2019 3:45 pm
Forum: Microscopes and optics
Topic: Microscope storage temperature
Replies: 15
Views: 1489

Re: Microscope storage temperature

I don't think a differential thermal expansion is a problem, unless you put the microscope in an oven or other source of high heat. The bigger problem for scopes is high humidity, causing fungal growth on the glass surfaces. Some people in tropical climes use enclosures with dehumidification in whic...
by wporter
Sat Jun 22, 2019 2:00 pm
Forum: Microscopes and optics
Topic: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?
Replies: 35
Views: 3537

Re: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?

So, I will try black paint, perhaps it will help some. Carefully of course. Need to verify that the paint is compatible with immersion oil. Good point; I now retract my suggestion to use hobby paint, unless it claims to be oil-resistant. Radio-controlled airplane paint might work, if for use on pla...
by wporter
Sat Jun 22, 2019 12:25 am
Forum: Microscopes and optics
Topic: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?
Replies: 35
Views: 3537

Re: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?

I'm not sure if it makes a lot of difference what paint you use, but you might go to a hobby shop and get a small jar of flat black paint that modelers use on model planes and trains. Clean the surface with acetone, and stroke gently with a modeler's paintbrush upwards along the outside of the frust...
by wporter
Mon Jun 17, 2019 5:20 pm
Forum: Camera systems and imaging
Topic: Using flash produces blurred images
Replies: 24
Views: 2517

Re: Using flash produces blurred images

Exactly; if the flash is off-center and the lighting is thus not optimal, than the camera auto-exposure may be using too long of an exposure, picking up vibration.
by wporter
Mon Jun 17, 2019 2:14 pm
Forum: Camera systems and imaging
Topic: Using flash produces blurred images
Replies: 24
Views: 2517

Re: Using flash produces blurred images

The faint bands above all the edges might be caused by movement during exposure. Other than that, try putting a diffuser into the flash light-path. Another thing to try is substituting a hand-held led flashlight for the flash unit, and move it around laterally at the flash's normal position, to see ...
by wporter
Thu Jun 06, 2019 1:47 pm
Forum: Beginner's corner
Topic: What is the difference between these microscopes ? Which one is better ?
Replies: 38
Views: 5846

Re: What is the difference between these microscopes ? Which one is better ?

It seems to me that no one asking questions on a microscope forum should be frightened by a little 'technobabble'. It's like someone asking the question on a forum for four-wheel-drive vehicles: which is better, a Jeep Model x or a Land Rover model y. You are going to get a lot of technobabble, and ...
by wporter
Fri May 31, 2019 3:49 pm
Forum: Beginner's corner
Topic: What Do These Different Stains Do?
Replies: 7
Views: 1339

Re: What Do These Different Stains Do?

Thanks for the links to Conn's, very useful.
by wporter
Fri May 31, 2019 1:01 pm
Forum: Beginner's corner
Topic: What Do These Different Stains Do?
Replies: 7
Views: 1339

Re: What Do These Different Stains Do?

Here is some more on various protocols, for those wanting information overload:

http://www.ihcworld.com/protocol_database.htm
by wporter
Thu May 16, 2019 9:45 pm
Forum: My microscope
Topic: IOR ML-4M
Replies: 21
Views: 5914

Re: IOR ML-4M

The projection screen is possibly for this IOR microscope, the MC7, which has the broad top surface that matches the screen shape and size:
by wporter
Thu May 09, 2019 7:34 pm
Forum: Microscopy accessories
Topic: AO 820 Microtome Retract Question
Replies: 2
Views: 898

Re: AO 820 Microtome Retract Question

No, the 820 moves the specimen strictly in an up-and-down motion, no extra motions for clearing the blade, etc. It jogs the specimen forwards only toward the blade, at the top point of the stroke. So the motion is straight down for the cut, straight up without any forward-or-backward motion, jog for...
by wporter
Thu May 09, 2019 7:00 pm
Forum: Microscopes and optics
Topic: Balplan 10x objectives
Replies: 3
Views: 786

Re: Balplan 10x objectives

Well, Harold must have fallen off the boat. I'm not sure I would want to fall into the Yangtze, these days. Thanks for the breakdown. Comprehensive as usual. All of the objectives pictured are parfocal. The working distances are about 1mm for the left two, 10mm for the shorty, and 2mm for the newest...
by wporter
Wed May 08, 2019 11:45 pm
Forum: Microscopes and optics
Topic: Balplan 10x objectives
Replies: 3
Views: 786

Balplan 10x objectives

Here are five different 10x objectives that look to be for the Balplan, the farthest left a flat-field that looks very much like the adjacent planachromat. Does someone know the difference and/or the evolution of the 10x objectives as displayed by these? I have some guesses, but it would be nice to ...
by wporter
Wed May 08, 2019 9:50 pm
Forum: Microscopes and optics
Topic: Advice for microscope for microphotography
Replies: 7
Views: 1996

Re: Advice for microscope for microphotography

Those are nice images! If I were you, my next step would not be an upgrade of scope or camera, but rather a move to focus-stacking. That would significantly enhance the appeal of your images, which seem to be fine in terms of resolution, focus, etc. (which, if deficient, would have been the reason f...
by wporter
Wed May 08, 2019 5:42 pm
Forum: My microscope
Topic: Chinese microscope manufacturers overview
Replies: 72
Views: 20207

Re: Chinese microscope manufacturers overview

This thread has gone way off course; but to get it back on track, and to satisfy both antagonistic parties (older used big-four vs new Chinese), here's my suggestion: satisfied users of a good-to-excellent Chinese microscope should write a review, or at least a short note, about how great it is. We ...
by wporter
Thu May 02, 2019 2:33 pm
Forum: Camera systems and imaging
Topic: A question about the Past - shutter induced-vibrations in film cameras
Replies: 4
Views: 1171

Re: A question about the Past - shutter induced-vibrations in film cameras

I think we're spoiled! We expect to fasten our fancy new DSLR up to the scope and get instant gratification, just like taking an image of a field of flowers. Plus, 1) the old in-the-lens leaf shutters had very little vibration, compared to modern SLRs with mirror-slap and focal-plane shutters; 2) no...
by wporter
Thu May 02, 2019 2:08 pm
Forum: Illumination Techniques
Topic: In search of infrared light source for coaxial fiber illumination
Replies: 10
Views: 1594

Re: In search of infrared light source for coaxial fiber illumination

Pete, not a lousy solution at all, in fact, my first thought, too. The Carousels had a heat-absorbing glass disk about 1/4" (6mm) thick, and 2.5" (60mm) diameter, greenish-tinged (that are sold all over ebay as replacements) that can be easily removed: presto, instant IR.
by wporter
Fri Apr 26, 2019 1:41 pm
Forum: Microscopy accessories
Topic: Field diaphragm placement
Replies: 14
Views: 2339

Re: Field diaphragm placement

I agree with apochronaut. Kohler is a compensatory arrangement for use with 'point' sources of illumination. These days, with COB LEDs, properly placed diffusers, and sufficient LED brightness, Kohler is not necessary for many microscopes; it is still useful in high-powered lab scopes that may use a...
by wporter
Tue Apr 09, 2019 9:16 pm
Forum: Microscopes and optics
Topic: AO Cycloptic Photo Tube Components
Replies: 45
Views: 6461

Re: AO Cycloptic Photo Tube Components

My take on the two lenses in the photo attachment is that they are duplicates of the two lenses that occur in the head of the viewing body, in order to provide the appropriate magnification and corrections to match those that occur in the viewing body, prior to the eyepiece providing the finishing ...
by wporter
Tue Apr 09, 2019 5:49 pm
Forum: Pictures and Videos
Topic: Paramecium sp. feeding on bacteria
Replies: 8
Views: 2008

Re: Paramecium sp. feeding on bacteria

Beautiful and astounding video; well done! The ring-shaped formations may be an artifact of the squished environment under the coverglass and the presence of predators inside the bacterial formation: since they (the bacteria) can't move in the Z direction, but only in X and Y, they can't move the gl...
by wporter
Tue Apr 09, 2019 2:17 pm
Forum: Microscopes and optics
Topic: AO Cycloptic Photo Tube Components
Replies: 45
Views: 6461

Re: AO Cycloptic Photo Tube Components

The unit will be parfocal with an eyepiece in it, but only visually. This is why I shortened mine,and dispensed with the eyepiece altogether. The lens just below the aluminum tube riser serves as a decent projection lens for my camera, and the camera image sensor is now parfocal with the view throug...
by wporter
Thu Apr 04, 2019 6:07 pm
Forum: Beginner's corner
Topic: Choosing Stereo Scope over Microscope
Replies: 16
Views: 2813

Re: Choosing Stereo Scope over Microscope

Don't neglect Craigslist, if you have nothing against used microscopes. The advantage here is that you get to inspect the microscope before you buy. Here is an example listing around the San Diego area. Note that there is a B&L stereozoom for only $75 (no, it's not mine). Some of these microscopes a...
by wporter
Thu Apr 04, 2019 5:57 pm
Forum: Microscopes and optics
Topic: Can anyone identify this DIC prism?
Replies: 13
Views: 1738

Re: Can anyone identify this DIC prism?

Pete, to continue the thread a bit, here are two DIC sliders, the first on a Polyvar 2 (trans, and epi I think), the second on a Polyvar Met (no transmitted light capability):
by wporter
Thu Apr 04, 2019 1:07 am
Forum: Microscopes and optics
Topic: Can anyone identify this DIC prism?
Replies: 13
Views: 1738

Re: Can anyone identify this DIC prism?

Glad I could help, Pete. Keep us posted with your DIC experiments. Neat stuff! Phil: A photo spread of the Univar, eh? I haven't done that because it might be misinterpreted as materialism, or bragging, or some other pathology. I try to keep it low-key, because my feeling is that equipment is (above...