Search found 6982 matches

by 75RR
Sun Jul 12, 2020 5:08 am
Forum: Pictures and Videos
Topic: Marine ciliate
Replies: 3
Views: 40

Re: Marine ciliate

Thanks DonSchaeffer and hans The ciliate is about 3/4 of a millimeter long The lines you refer to are rows of cilia, as the ciliate changes position they move in and out of focus. I was experimenting with the camera setup, as I do from time to time. Can't seem to leave things alone :) In this case i...
by 75RR
Sat Jul 11, 2020 9:13 pm
Forum: Pictures and Videos
Topic: Marine ciliate
Replies: 3
Views: 40

Marine ciliate

by 75RR
Sat Jul 11, 2020 5:59 pm
Forum: Beginner's corner
Topic: Microscope for moss/plants
Replies: 2
Views: 61

Re: Microscope for moss/plants

I would suggest that if you are going to go through a dealer as opposed to clicking on a button in an online shop that you ask for the 100x objective to be substituted by a 20x. Most budget compound microscopes have a 4 place nosepiece so that would leave you with: 4x, 10x, 20x and 40x objectives. W...
by 75RR
Fri Jul 10, 2020 7:49 pm
Forum: Resources (online, books etc.)
Topic: Diatom illustrated catalogue 1988
Replies: 4
Views: 2515

Re: Diatom illustrated catalogue 1988

Glad you both found it useful.
Don't spend all the bingo money all at once!
Just lost my shirt, selling dog to try and recoup my losses. Kids next!
by 75RR
Fri Jul 10, 2020 7:26 pm
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

I have a good friend who is a Zeiss representative and after seeing this thread I was curious what he had to say about it. " Basically “Fixed Kohler” is a way to lock the centration and height of the condenser so that users/students can’t mess it up. The reason for Fixed Kohler is to offer a micros...
by 75RR
Fri Jul 10, 2020 2:07 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

Maybe I would be better off just getting a new scope complete with, hopefully, better objectives, after all? It is true that the objectives are the heart of a microscope, but you do have to place them in a 'good' stand. The one you have is not going to do them justice. If you want to get some nikon...
by 75RR
Fri Jul 10, 2020 12:29 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

In any case, comparing the finite and 'infinity' objectives by using them as magnifying glasses doesn't show any obvious differences ... Just turn on your microscope as you would normally do, focus on a slide, then take off the head and place a paper over the light beam from the 'infinity' objectiv...
by 75RR
Fri Jul 10, 2020 11:42 am
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

Here is a compact description of the difference : "Handbook of Biological Confocal Microscopy, Volume 236" edited by James Pawley, pages 156-157 (viewable on the internet when I google "infinity optics vs 160mm tube lens" or similar. I think you need to allow for different browsers etc ... I had no...
by 75RR
Fri Jul 10, 2020 11:00 am
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

Have you taken them apart or something like that to confirm that? Or more just from testing samples and getting the same performance? It'd love to hear more about that (though it may deserve its own thread). I would have thought that one could confirm it is an infinity objective by removing the mic...
by 75RR
Thu Jul 09, 2020 9:02 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

I don't think it is supposed to work. This is what microscopyu says: https://www.microscopyu.com/microscopy-basics/microscope-objective-specifications Most manufacturers have now transitioned to infinity-corrected objectives that project emerging rays in parallel bundles from every azimuth to infini...
by 75RR
Thu Jul 09, 2020 5:34 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

I was just wondering about the use of infinity-corrected objectives in a finite tube? My old Brunel (above) has a 160mm tube length. I bought a x20 plan objective for it a while ago (all 4 are Plan now) but the one I received is marked as an infinity objective. What is the Numerical Aperture of the...
by 75RR
Thu Jul 09, 2020 4:50 pm
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

A field diaphragm is one of the essential parts of what they are now calling Full Köhler, I think Fixed Köhler is perilously close to being a kissing cousin to 2000x magnification. That's what I'm thinking, but if so, I'm surprised to see Olympus adopting it. They are providing both, the Fixed Köhl...
by 75RR
Thu Jul 09, 2020 4:03 pm
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

Zuul wrote:
Thu Jul 09, 2020 3:47 pm

I believe it’s the condenser diaphragm that performs that function. The field diaphragm is used to center and focus the condenser, then opened fully. Am I mistaken?
Yes to center and focus, partially closed depending on the objective to reduce glare.
by 75RR
Thu Jul 09, 2020 3:52 pm
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

I understand that the lamp is pre-centered, but my understanding of Kohler is that a field diaphragm is essential to match the spread of illumination to the objective in use... https://www.olympus-lifescience.com/en/microscope-resource/primer/anatomy/kohler/ If a field diaphragm is an essential par...
by 75RR
Thu Jul 09, 2020 9:55 am
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

To save interested parties having to type out the sentence in a translator, here it is: Fixed Köhler significa que esta pre-centrado de fabrica y que no debe ser necesario el reajuste. + google translate: Fixed Köhler means that it is pre-centered at the factory and no re-adjustment is necessary. + ...
by 75RR
Thu Jul 09, 2020 9:53 am
Forum: Microscopes and optics
Topic: Fixed Köhler
Replies: 45
Views: 945

Re: Fixed Köhler

I'm still not clear what is the difference between "fixed Köhler" and a microscope without Köhler illumination.
Decided to contact Motic, this is their reply
.
by 75RR
Thu Jul 09, 2020 8:24 am
Forum: My microscope
Topic: Just Received my Hayear HY500B camera
Replies: 18
Views: 250

Re: Just Received my Hayear HY500B camera

MichaelG. wrote:
Thu Jul 09, 2020 6:55 am

There does seem to be an edgy, almost pointillist, character to your images
:) Full time or part time art critic?
by 75RR
Thu Jul 09, 2020 7:16 am
Forum: Pictures and Videos
Topic: Nice testate amoebe, but which one?
Replies: 6
Views: 116

Re: Nice testate amoebe, but which one?

Good catch. I take it you looked here: https://www.arcella.nl/lobose-testate-amoebae/ I find it takes quite a lot of experience and reading to ID most amoebae, which is why I am not very good at it :) One needs to know what to look for to enable an ID and then try to capture those areas in the image...
by 75RR
Thu Jul 09, 2020 6:48 am
Forum: Identification help
Topic: Please help identify some things I am frequently seeing in dirty backyard water
Replies: 14
Views: 136

Re: Please help identify some things I am frequently seeing in dirty backyard water

Comments regarding image quality relative to what could be expected with this sort of setup or any signs of a problem or adjustment needed with the microscope would be helpful. How do the images compare with what you see though the eyepieces? They do seem a little washed out. Also a holder for your...
by 75RR
Wed Jul 08, 2020 8:59 pm
Forum: Identification help
Topic: ID help for beginner
Replies: 2
Views: 60

Re: ID help for beginner

For the first two images, blobs and an air bubble sound about right. The third one looks like a Statoblast, which is a good catch!
by 75RR
Wed Jul 08, 2020 3:19 pm
Forum: Pictures and Videos
Topic: Parental care with gastrotrichs
Replies: 10
Views: 186

Re: Parental care with gastrotrichs

Many thanks for the detailed info, I was not aware of those details.

I am afraid I have read very little on gastrotrichs so far. Something I will have to amend!
by 75RR
Wed Jul 08, 2020 3:15 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

photomicro wrote:
Wed Jul 08, 2020 1:03 pm
Have sent PM, but not sure if you have been a member long enough.
New members can receive but not sent PMs so you would need to include a means of contact.
by 75RR
Wed Jul 08, 2020 3:13 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

Hope you enjoy your shiny new microscope for many years yet :)
by 75RR
Wed Jul 08, 2020 4:08 am
Forum: Beginner's corner
Topic: 'Noise' when viewing at higher magnifications
Replies: 12
Views: 162

Re: 'Noise' when viewing at higher magnifications

When I looked through the lower magnification objectives I can see things pretty well, but when I get up to the highest ones, suddenly it's like I'm trying to see through layers of murk. There are lots of dark spots that move around. The fact that they move around would indicate that we are talking...
by 75RR
Wed Jul 08, 2020 3:48 am
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

That would suggest that new Euromex or Motic are poor quality? I am saying that the quality of the big 4 research microscopes from the 160 tube length era is superior. Still, a used microscope is not for everyone. You should however look into it before deciding. Have a read through this pdf: http:/...
by 75RR
Tue Jul 07, 2020 10:43 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

I did mean that you look at second hand microscopes from the big 4 or 5 ish. New from any of them is crazy. £2000 is a very generous budget within the used microscope market, and I mean very generous! You can get a good quality used microscope with phase for less than half that with a little patienc...
by 75RR
Tue Jul 07, 2020 9:36 pm
Forum: For forum members who want to buy and sell equipment
Topic: Lomo MBD-1 microscope no. 693029
Replies: 2
Views: 96

Re: Lomo MBD-1 microscope no. 693029

The removable head has been removed and is missing.
Nice turn of phrase!

Is that the original box? There does not seem to be enough room for the missing head to fit in it.

Image
by 75RR
Tue Jul 07, 2020 9:26 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 54
Views: 446

Re: Euromex or Motic?

I've had an oldish unbranded trinocular scope since the '90s which I've upgraded to plan objectives. Could you post a photo of it? Just curious. Given that you have a couple of decades of experience, I wonder why you have not considered buying one of the big 4ish. They all have modular systems that...
by 75RR
Mon Jul 06, 2020 9:23 pm
Forum: Introduce yourself
Topic: Hi, I'm new here
Replies: 7
Views: 202

Re: Hi, I'm new here

So Luca ... do tell us what happened to Hi, I'm Katja
by 75RR
Mon Jul 06, 2020 7:53 pm
Forum: Pictures and Videos
Topic: Parental care with gastrotrichs
Replies: 10
Views: 186

Re: Parental care with gastrotrichs

Many thanks for taking the trouble to look up the old video. Such behavior is very interesting. I have come across them before but never laying an egg nor camouflaging it after either! This was one I was lucky to be able to video, they are usually so fast that I don't even try to capture them unless...