Search found 353 matches
- Mon Dec 16, 2019 10:29 pm
- Forum: Microscopes and optics
- Topic: Urgent! Labovert Leitz - please advise!
- Replies: 12
- Views: 6035
Re: Urgent! Labovert Leitz - please advise!
Laboverts are very nice scopes. They even have their own patent: US patent 4,619,503, which also covers the Fluovert (the fluorescence version). The idea was to make an inverted stand more like the usual upright scope, which would lessen confusion when moving back-and-forth between the two types. Th...
- Sat Dec 14, 2019 8:39 pm
- Forum: Miscellaneous
- Topic: Protist behavioral complexity
- Replies: 8
- Views: 6818
Re: Protist behavioral complexity
Why on earth would a biologist think that single cells were "genetically programmed to respond uniformly to some stimulus"? Cells are well known to have a multitude of different receptors in their cell membranes. Depending on the effect of a variable stimulus on different types and/or different numb...
- Sat Dec 14, 2019 3:28 pm
- Forum: Beginner's corner
- Topic: Microscope -Avian Disease's
- Replies: 9
- Views: 4433
Re: Microscope -Avian Disease's
I'm sure Apo will chime in, but from my perspective, 1) it looks like a nice scope, 2) you don't need DIC, probably limited application for bacteria, and may not be available for this scope and certainly not for your budget; 3) the scope is shown with B&L eyepieces; get yourself some AO eyepieces. A...
- Sat Dec 07, 2019 6:08 pm
- Forum: Microscopes and optics
- Topic: Neural lens paper
- Replies: 1
- Views: 1519
- Thu Dec 05, 2019 7:23 pm
- Forum: Microscopes and optics
- Topic: Meaning of Red dot on a Leitz eyepiece?
- Replies: 2
- Views: 1898
Re: Meaning of Red dot on a Leitz eyepiece?
High eyepoint eyepieces are generally meant for people who wear eyeglasses, so they don't bump their glasses into the eyelens of the eyepiece. The red dot seems to indicate a Leitz eyepiece that is best for photography; perhaps this means that it is a projective eyepiece (not for afocal), but there ...
- Thu Dec 05, 2019 12:35 am
- Forum: Miscellaneous
- Topic: Is there a recognised definition of ‘Microplastics’ ?
- Replies: 16
- Views: 7724
Re: Is there a recognised definition of ‘Microplastics’ ?
"How can quantitative surveys of ‘Microplastics’ have any credibility ?" Why not? When you read a simplistic summary of research in the popular press, sometimes it makes no sense. You will have to read the journal article to understand the constraints and methodologies involved, and to understand th...
- Tue Nov 26, 2019 5:14 pm
- Forum: Microscopes and optics
- Topic: Ortholux tube lens
- Replies: 5
- Views: 4330
Re: Ortholux tube lens
Thanks for the very comprehensive info, Dave P. I know many the later (1980s) 160mm TL Leitz scopes used FSA heads also, although they often had a dash with some additional letters, indicating particular models with different features. Is that when the the 42mm head mount came in? ( versus the earli...
- Sat Nov 23, 2019 3:13 pm
- Forum: Beginner's corner
- Topic: thinking out loud here - moral thoughts
- Replies: 21
- Views: 9939
Re: thinking out loud here - moral thoughts
If it makes you feel better, by all means return them to their original habitat. But realize that this action is for you, not them. In some manner this can be seen as symbolically honoring or respecting life, but it is probably only really meaningful to you, not so much to the microscopic critters. ...
- Thu Nov 21, 2019 10:43 pm
- Forum: Illumination Techniques
- Topic: Identifying asbestos
- Replies: 26
- Views: 16893
Re: Identifying asbestos
Another possible reference, from the esteemed McCrone Research Institute:
http://www.mccroneinstitute.org/v/90/as ... tification
http://www.mccroneinstitute.org/v/90/as ... tification
- Sat Nov 16, 2019 8:35 pm
- Forum: Miscellaneous
- Topic: Unlocking Nature's Secrets: The Serengeti Rules:
- Replies: 5
- Views: 4329
Re: Unlocking Nature's Secrets: The Serengeti Rules:
It is currently on PBS in the US. It is an outstanding production.
- Wed Oct 23, 2019 8:18 pm
- Forum: Microscopes and optics
- Topic: XY-table for Zeiss standard inverted metallurgical
- Replies: 2
- Views: 2517
Re: XY-table for Zeiss standard inverted metallurgical
Well, they were pretty practical for what the scopes were mainly used for: scanning metallic surfaces. The rails and grooves were usually juiced up with a suitable grease so that the friction and stiction were not a big issue. The Invertoscope was also made with an x-y stage for trans-illumination. ...
- Mon Sep 23, 2019 10:10 pm
- Forum: Digital processing
- Topic: Change lighting on laptop
- Replies: 6
- Views: 8989
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...
- Thu Sep 12, 2019 6:06 pm
- Forum: Microscopes and optics
- Topic: B&L Balplan/Microzoom II light path selector
- Replies: 9
- Views: 5555
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...
- Thu Sep 12, 2019 1:39 am
- Forum: Microscopes and optics
- Topic: B&L Balplan/Microzoom II light path selector
- Replies: 9
- Views: 5555
Re: B&L Balplan/Microzoom II light path selector
No, just a prism moves with the lever.
Where exactly is this threaded boss?
Where exactly is this threaded boss?
- Mon Sep 09, 2019 3:25 pm
- Forum: Identification help
- Topic: Is this real?
- Replies: 11
- Views: 9404
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...
- Sat Sep 07, 2019 2:03 am
- Forum: Beginner's corner
- Topic: immersion oil question
- Replies: 9
- Views: 5530
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.
- 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: 4780
Re: Zeiss Universal for sale
The protrusion is a 3-layer slide holding multiple filters.
- Wed Jun 26, 2019 3:45 pm
- Forum: Microscopes and optics
- Topic: Microscope storage temperature
- Replies: 15
- Views: 7528
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...
- Sat Jun 22, 2019 2:00 pm
- Forum: Microscopes and optics
- Topic: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?
- Replies: 40
- Views: 16226
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...
- Sat Jun 22, 2019 12:25 am
- Forum: Microscopes and optics
- Topic: Zeiss Cardiodid condenser fails with high NAs - peeling paint ?
- Replies: 40
- Views: 16226
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...
- Mon Jun 17, 2019 5:20 pm
- Forum: Camera systems and imaging
- Topic: Using flash produces blurred images
- Replies: 24
- Views: 10600
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.
- Mon Jun 17, 2019 2:14 pm
- Forum: Camera systems and imaging
- Topic: Using flash produces blurred images
- Replies: 24
- Views: 10600
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 ...
- 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: 18989
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 ...
- Fri May 31, 2019 3:49 pm
- Forum: Beginner's corner
- Topic: What Do These Different Stains Do?
- Replies: 7
- Views: 4147
Re: What Do These Different Stains Do?
Thanks for the links to Conn's, very useful.
- Fri May 31, 2019 1:01 pm
- Forum: Beginner's corner
- Topic: What Do These Different Stains Do?
- Replies: 7
- Views: 4147
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
http://www.ihcworld.com/protocol_database.htm
- Thu May 16, 2019 9:45 pm
- Forum: My microscope
- Topic: IOR ML-4M
- Replies: 21
- Views: 15733
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:
- Thu May 09, 2019 7:34 pm
- Forum: Microscopy accessories
- Topic: AO 820 Microtome Retract Question
- Replies: 2
- Views: 2934
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...
- Thu May 09, 2019 7:00 pm
- Forum: Microscopes and optics
- Topic: Balplan 10x objectives
- Replies: 3
- Views: 2385
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...
- Wed May 08, 2019 11:45 pm
- Forum: Microscopes and optics
- Topic: Balplan 10x objectives
- Replies: 3
- Views: 2385
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 ...
- Wed May 08, 2019 9:50 pm
- Forum: Microscopes and optics
- Topic: Advice for microscope for microphotography
- Replies: 7
- Views: 5088
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...