Search found 1896 matches

by MichaelG.
Tue May 05, 2020 7:17 pm
Forum: Beginner's corner
Topic: Where to place filters in light path?
Replies: 9
Views: 471

Re: Where to place filters in light path?

Hobbyst46 wrote:
Tue May 05, 2020 6:55 pm
If I place a glass filter directly on the glass cover of the field aperture (the beam port in the base of the microscope), for example, and even if it is not scrupulousely clean, it remains transparent and does not interfere with the image.
... and Koehler wins again !!

MichaelG.
by MichaelG.
Tue May 05, 2020 7:06 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 793

Re: objective nomenclature

Looks like I will remain confused for a while longer

... I was hoping the inner truth had been revealed :(

MichaelG.
.

Edit: Perhaps the best evidence might come from a price list !!
by MichaelG.
Tue May 05, 2020 5:19 pm
Forum: Beginner's corner
Topic: objective nomenclature
Replies: 17
Views: 793

Re: objective nomenclature

Charles wrote:
Tue May 05, 2020 2:48 pm
The Pl means Plan and the NPl means Normal Plan. They say the NPl is better than the Pl.
.
Interesting ... Does ‘Normal’ in this case mean ‘perpendicular to’ ?
i.e. the image is not only flat, but accurately perpendicular to the optical axis

MichaelG.
by MichaelG.
Tue May 05, 2020 5:10 pm
Forum: Microscopes and optics
Topic: Eyepiece Camera Limits Visual Field from Eyepieces
Replies: 7
Views: 404

Re: Eyepiece Camera Limits Visual Field from Eyepieces

Bewildered by your numbers, until I realised ...

1.7 ÷ 25 = 0.068
4.7 ÷ 10 = 0.47
seems unlikely

4.7 ÷ 25 = 0.188
1.7 ÷ 10 = 0.17
seems logical

MichaelG.
by MichaelG.
Mon May 04, 2020 8:20 pm
Forum: Beginner's corner
Topic: Specimen ethics
Replies: 42
Views: 2661

Re: Specimen ethics

DrPhoxinus wrote:
Mon May 04, 2020 8:04 pm
Lab was working on Paramecium / Didinium predator prey dynamics, using Protoslo
.

Useful link to a previous discussion about Protoslo :
viewtopic.php?t=4419

MichaelG.
by MichaelG.
Mon May 04, 2020 5:16 pm
Forum: Pictures and Videos
Topic: Actinocyclus subtilis
Replies: 18
Views: 765

Re: Actinocyclus subtilis

Obviously a fine lens, being used well
... with beautiful results.

Science and Art in harmony.

MichaelG.
by MichaelG.
Mon May 04, 2020 3:15 pm
Forum: Illumination Techniques
Topic: Improving Top-Stage Lighting Using a Smaller Aperture on the Lamp
Replies: 22
Views: 1157

Re: Improving Top-Stage Lighting Using a Smaller Aperture on the Lamp

I use a gooseneck lamp I bought in Ikea two years ago. I have been making "snoops" out of aluminum foil to make smaller apertures for it. I ordered some light conducting cable (about 2 mm diameter) that I will attach to the lamp so I can bring light directly onto the stage of the microscope (especi...
by MichaelG.
Mon May 04, 2020 9:11 am
Forum: Camera systems and imaging
Topic: Comparison Images/Videos | $8 Phone Adapter | $110 NDPL Adapter | $450 NDPL Adapter
Replies: 7
Views: 793

Re: Comparison Images/Videos | $8 Phone Adapter | $110 NDPL Adapter | $450 NDPL Adapter

Is very puzzling. There's no way a 7x would give you a pleasing result on a dslr. I wonder if that was a typo. I need to do some comparisons showing how variable these adapters are from system to system. Edit:mine is an ndpl2. Definitely not a 7x, though I did see thr ndpl 1 lsbeled '9.3x' so it co...
by MichaelG.
Sun May 03, 2020 6:10 pm
Forum: Camera systems and imaging
Topic: Comparison Images/Videos | $8 Phone Adapter | $110 NDPL Adapter | $450 NDPL Adapter
Replies: 7
Views: 793

Re: Comparison Images/Videos | $8 Phone Adapter | $110 NDPL Adapter | $450 NDPL Adapter

Thanks for starting this discussion, Sir ... I think it will become a useful reference for many. I am not familiar with either of the NDPL adapters ... so I did a little of browsing, and found this interesting note: https://www.reddit.com/r/microscopy/comments/49lyyo/discovered_an_important_detail_a...
by MichaelG.
Sun May 03, 2020 12:27 am
Forum: Camera systems and imaging
Topic: Help needed to design adaptor for Mirrorless camera
Replies: 13
Views: 622

Re: Help needed to design adaptor for Mirrorless camera

Great progress, Marco !!

MichaelG.
by MichaelG.
Sat May 02, 2020 11:35 am
Forum: Camera systems and imaging
Topic: Help needed to design adaptor for Mirrorless camera
Replies: 13
Views: 622

Re: Help needed to design adaptor for Mirrorless camera

Just to be clear, Marco ... I am suggesting that you increase the physical tube length into the space marked by my green lines [optical tube length remains as designed] Then add a second trio of screws, displaced as far as convenient, nearer to the ‘scope. [*] . 6A9A5EC6-48CD-4253-A114-1F688850DB18....
by MichaelG.
Sat May 02, 2020 8:23 am
Forum: Camera systems and imaging
Topic: Raspberry Pi High Quality Camera
Replies: 14
Views: 813

Re: Raspberry Pi High Quality Camera

More info. here: https://www.raspberrypi.org/blog/new-product-raspberry-pi-high-quality-camera-on-sale-now-at-50/ and https://www.sony-semicon.co.jp/products/common/pdf/IMX477-AACK_Flyer.pdf ... It looks very promising. MichaelG. . Sorry but I couldn’t face all those ‘privacy settings’ on the Engadg...
by MichaelG.
Sat May 02, 2020 7:27 am
Forum: Camera systems and imaging
Topic: Help needed to design adaptor for Mirrorless camera
Replies: 13
Views: 622

Re: Help needed to design afocal adaptor for Mirrorless camera

Marco68 wrote:
Fri May 01, 2020 10:39 pm
Ps: i am a little bit concerned that the screws will scratch my eyepiece tube...
Options to consider:
  • Nylon screws
  • Nylon-tipped metal screws
  • Protective sleeve [with slit] over microscope tube
etc.

MichaelG.
by MichaelG.
Sat May 02, 2020 7:22 am
Forum: Camera systems and imaging
Topic: Help needed to design adaptor for Mirrorless camera
Replies: 13
Views: 622

Re: Help needed to design adaptor for Mirrorless camera

HI, I am trying to desing an adapter to connect my Fuji mirroless XE2 camera (without lens) to my Leica DMLS microscope (binocular !) . I am at beginning of my learning curve in microscopy and with limited competence in mechanical drawing.. any help/advise is welcome ! . Below a sketch how I think ...
by MichaelG.
Thu Apr 30, 2020 6:41 pm
Forum: Beginner's corner
Topic: Specimen ethics
Replies: 42
Views: 2661

Re: Specimen ethics

JGardner wrote:
Thu Apr 30, 2020 5:18 pm
When I'm done with a slide, everything goes into a bucket filled with IPA. After a week or two in the bucket I pour off the alcohol ...
Ah but do you drink it ? :lol:

MichaelG.
by MichaelG.
Thu Apr 30, 2020 1:48 pm
Forum: Miscellaneous
Topic: Hero Shrew : amazing backbone
Replies: 2
Views: 440

Re: Hero Shrew : amazing backbone

:D
by MichaelG.
Thu Apr 30, 2020 9:12 am
Forum: Miscellaneous
Topic: Hero Shrew : amazing backbone
Replies: 2
Views: 440

Hero Shrew : amazing backbone

I saw reference to this on the National Geographic feed, this morning:

The full paper is available for free download from The Royal Society
https://royalsocietypublishing.org/doi/ ... .2020.0457

Fascinating !!

MichaelG.
by MichaelG.
Tue Apr 28, 2020 9:17 pm
Forum: Miscellaneous
Topic: Luminescent dinoflagellates
Replies: 3
Views: 535

Re: Luminescent dinoflagellates

Some good background reading here:
https://www.ncbi.nlm.nih.gov/pmc/articl ... -00003.pdf

But it doesn’t do justice to the beauty and spectacle

MichaelG.
by MichaelG.
Tue Apr 28, 2020 7:21 pm
Forum: Miscellaneous
Topic: Luminescent dinoflagellates
Replies: 3
Views: 535

Luminescent dinoflagellates

I can’t claim any credit for this ... but thought I must share it, in the hope that someone can tell me more : https://www.smithsonianmag.com/smart-ne ... 180974766/

MichaelG.
by MichaelG.
Tue Apr 28, 2020 8:07 am
Forum: Miscellaneous
Topic: Lamps
Replies: 1
Views: 397

Re: Lamps

To the best of my knowledge ... No

They all have compact filaments, so there is no need for ‘specials’
... Just check that the filament is at the appropriate height.

MichaelG.
by MichaelG.
Mon Apr 27, 2020 10:48 pm
Forum: Sandbox
Topic: picture test
Replies: 2
Views: 667

Re: picture test

Test failed, methinks !!

MichaelG.
by MichaelG.
Mon Apr 27, 2020 9:43 pm
Forum: Beginner's corner
Topic: Reliable Dealers
Replies: 4
Views: 576

Re: Reliable Dealers

Brunel has an excellent reputation ... but do bear in mind that they are UK based
http://www.brunelmicroscopes.co.uk/
http://www.usedmicroscopes.co.uk/

MichaelG.
by MichaelG.
Mon Apr 27, 2020 8:33 am
Forum: Microscopes and optics
Topic: Zeiss WL Modified with Tilt Top
Replies: 20
Views: 1790

Re: Zeiss WL Modified with Tilt Top

No idea ... But I like it a lot
and at the price paid, I am sure it was a bargain.

MichaelG.
[envious]

.
Edit: May be worth asking here: http://www.fritzinstruments.com/
by MichaelG.
Sun Apr 26, 2020 1:06 pm
Forum: Pictures and Videos
Topic: Elastic Stentor
Replies: 7
Views: 831

Re: Elastic Stentor

That’s fabulous, Chris and it’s nice to see the little fellas taking a ride in the current !! ... helps us to visualise the hydrodynamics MichaelG. . Edit: I think we can safely say that your video is significantly more informative than this reference image: https://micro.magnet.fsu.edu/primer/techn...
by MichaelG.
Sat Apr 25, 2020 7:51 am
Forum: Beginner's corner
Topic: Specimen ethics
Replies: 42
Views: 2661

Re: Specimen ethics

GlennK wrote:
Sat Apr 25, 2020 12:24 am
... But these wonderings are what make microscopy really engaging.
Well said, Glenn

MichaelG.
by MichaelG.
Fri Apr 24, 2020 6:30 pm
Forum: For forum members who want to buy and sell equipment
Topic: Found: Leitz K4 condenser lens (Can a mod please move this to the equipment discussion? Thanks!)
Replies: 34
Views: 1524

Re: Found: Leitz K4 condenser lens (Can a mod please move this to the equipment discussion? Thanks!)

mrsonchus wrote:
Fri Apr 24, 2020 5:00 pm
Incidentally the 'whitish-cream-coloured' area seen in images of a K4 is just part of the inner surface, bent to look curved by the K4 lens in images....
Thanks for the enlightenment, John
... I remain intrigued by the K4, and would like to properly understand its formulation.

MichaelG.
by MichaelG.
Thu Apr 23, 2020 1:33 pm
Forum: For forum members who want to buy and sell equipment
Topic: Found: Leitz K4 condenser lens (Can a mod please move this to the equipment discussion? Thanks!)
Replies: 34
Views: 1524

Re: Found: Leitz K4 condenser lens (Can a mod please move this to the equipment discussion? Thanks!)

Thanks for that very helpful note, Rorschach I don’t have any present need for a K4 ... but who knows What I do have, however, is an ‘academic’ interest in how Leitz designed and implemented these variations on the condenser theme. The picture that John B posted is quite intriguing, because it appea...
by MichaelG.
Thu Apr 23, 2020 7:23 am
Forum: Off Topic
Topic: Please opine source, time term 'coined'...diatom twitching?
Replies: 4
Views: 634

Re: Please opine source, time term 'coined'...diatom twitching?

I believe that the term originated as a gentle ridicule of those enthusiastic birdwatchers who must ‘spot’ all the rarities.

MichaelG.

.
Edit: Here you go ...
https://www.theguardian.com/notesandque ... 86,00.html
by MichaelG.
Wed Apr 22, 2020 10:45 pm
Forum: Microscopes and optics
Topic: 40x SPlan woes
Replies: 53
Views: 3693

Re: 40x SPlan woes

I believe this is it :
viewtopic.php?p=73981#p73981

MichaelG.