Search found 3980 matches

by MichaelG.
Tue Feb 06, 2024 6:48 am
Forum: Beginner's corner
Topic: Several choices of microscopes; what's your opinion?
Replies: 17
Views: 1537

Re: Several choices of microscopes; what's your opinion?

As a disinterested observer [which is not the same as being uninterested] … I would welcome the open discussion that charlie g has invited. The forum exists as a learning and information-sharing platform for all of us … so let’s all see [and perhaps contribute to] the technical aspects, please. Mich...
by MichaelG.
Tue Feb 06, 2024 3:27 am
Forum: Pictures and Videos
Topic: Collection of live round Diatoms
Replies: 2
Views: 314

Re: Collection of live round Diatoms

Nicely done
… and an important reminder that the pretty structures we usually admire are only their skeletal remains.

MichaelG.
by MichaelG.
Mon Feb 05, 2024 9:02 pm
Forum: Microscopes and optics
Topic: Determining the back focal plane of an objective
Replies: 5
Views: 556

Re: Determining the back focal plane of an objective

It doesn’t answer the question explicitly, but your will find 17 occurrences of the term here:
https://www.iso.org/obp/ui#iso:std:iso: ... :sec:3.1.9
and collectively they explain.

I am posting that link because it’s very rare to get a freebie from a Standards Organisation !

MichaelG.
by MichaelG.
Fri Feb 02, 2024 7:48 pm
Forum: Illumination Techniques
Topic: Has anyone ever used LWD condenser?
Replies: 8
Views: 944

Re: Has anyone ever used LWD condenser?

I think tis probably gives the game away: https://www.fishersci.fi/shop/products/condenser-achromatic-lwd-ba410/15425302 The long working distance facilitates its use with phase contrast accessories MichaelG. . See also: https://moticeurope.com/en/lwd-achromatic-condenser-na-065-wd108mm-with-iris-di...
by MichaelG.
Thu Feb 01, 2024 8:29 am
Forum: Microscopes and optics
Topic: Lomo objective designations
Replies: 33
Views: 6946

Re: Lomo objective designations

It is quite good and covers full frame sensors if I remember correctly, assuming one shoots focus stacks, because it is not plan. It was actually my exact LOMO 3.7x that RobertOToole tested and praised, after which the price went up dramatically. Congratulations !! I was looking back at his reviews...
by MichaelG.
Wed Jan 31, 2024 10:07 pm
Forum: Microscopes and optics
Topic: Lomo objective designations
Replies: 33
Views: 6946

Re: Lomo objective designations

The mystery deepens
… this ebay item has a “plano-convex” egraved on it
https://www.ebay.com/itm/395033242941

I admit, I am lost !

MichaelG.
by MichaelG.
Wed Jan 31, 2024 9:48 pm
Forum: Microscopes and optics
Topic: Lomo objective designations
Replies: 33
Views: 6946

Re: Lomo objective designations

Hello. Thank you for this thread. Can someone suggest the meaning of the following symbol on a LOMO water immersion objective? IMG_5630.jpeg Thanks. At a very wild guess, I would say it’s a simple biconvex lens element ! … but I hope that’s not valid What other markings are there on the objective b...
by MichaelG.
Tue Jan 30, 2024 8:53 am
Forum: Pictures and Videos
Topic: Some arcellinid amoebae in SEM
Replies: 21
Views: 1551

Re: Some arcellinid amoebae in SEM

I keep returning to < Difflugia brevicolla.jpg >

All of the images are wonderful in various ways …
but that one somehow encapsulates how little we comprehend.

It astonishes me every time I look at it.

MichaelG.
by MichaelG.
Tue Jan 30, 2024 6:03 am
Forum: Beginner's corner
Topic: Several choices of microscopes; what's your opinion?
Replies: 17
Views: 1537

Re: Several choices of microscopes; what's your opinion?

Hi, jackieone, are you located con-US? I have excellent 160mm/finite SteindorfBerlin with trinocular head, with illumination setup. very low cost+ shipping. Other scope setups too , Olympus/Tokyo CKa inverted microscope with illumination setup...$120+shipping, other scopes too. I also can supply mi...
by MichaelG.
Tue Jan 30, 2024 5:43 am
Forum: For forum members who want to buy and sell equipment
Topic: eBay Catch-22 Login Problem
Replies: 4
Views: 524

Re: eBay Catch-22 Login Problem

I am stunned that MichaelG required snail-mail postal from 'UK-eBay'. charlie g Not actually from ebay, charlie g The snail-mail arrangement was imposed by Tesco Bank [the supplier of my MasterCard] They posted a special letter, with a tear-off security layer embedded … this revealed the six-digit ...
by MichaelG.
Mon Jan 29, 2024 7:01 pm
Forum: For forum members who want to buy and sell equipment
Topic: eBay Catch-22 Login Problem
Replies: 4
Views: 524

Re: eBay Catch-22 Login Problem

I had a similar problem [U.K.] when trying to set-up my Tesco Credit Card on ApplePay Tesco will only send security codes by SMS … unlike PayPal, who will make an automated call to a land-line. It took a couple of weeks to sort out, because they insisted on sending me a physical letter, by Royal Mai...
by MichaelG.
Mon Jan 29, 2024 6:37 am
Forum: Pictures and Videos
Topic: "Assassin Bug"
Replies: 6
Views: 536

Re: "Assassin Bug"

Beautifully shot … and very well-observed.

You are clearly ‘in your element’

Thanks for sharing it.

MichaelG.
by MichaelG.
Sun Jan 28, 2024 3:39 pm
Forum: Microscopes and optics
Topic: Correction Collar : Leitz [surprise]
Replies: 11
Views: 12630

Re: Correction Collar : Leitz [surprise]

More detail from Leitz >> less comprehension This, from one of the Heine Condenser leaflets is “interesting” . source Right.jpeg . All I can say is that the 63x is a very pleasing objective to use … its working distance is longer than that of the 10x … and the resolution is all one could reasonably ...
by MichaelG.
Sat Jan 27, 2024 7:30 pm
Forum: Microscopes and optics
Topic: Yet another Japanese microscope company.
Replies: 4
Views: 441

Re: Yet another Japanese microscope company.

Strangely enough … I recognised the name, from an enquiry that I made in 2021 They were offering an interesting USB 3 camera at the time [before most others had made that leap] … it came to nothing, because of shipping arrangements, but I remember them being helpful and courteous. MichaelG. . . Sent...
by MichaelG.
Thu Jan 25, 2024 8:04 am
Forum: Pictures and Videos
Topic: Lily pollen
Replies: 9
Views: 695

Re: Lily pollen

.

Beautifully done, hkv

MichaelG.
by MichaelG.
Tue Jan 23, 2024 9:34 am
Forum: Microscopy accessories
Topic: Mystery Nikon Magnifier
Replies: 8
Views: 1122

Re: Mystery Nikon Magnifier

. Thanks for the further replies … I now need to expand upon my original question What design of eyepiece, on what instrument ? As originally stated: although the lower lens element works as a very nice ‘magnifying glass’ … I haven’t found any setting where the complete device will achieve focus ! …...
by MichaelG.
Mon Jan 22, 2024 5:16 pm
Forum: Miscellaneous
Topic: Black Japanning
Replies: 1
Views: 464

Black Japanning

A friend on the Model Engineer forum has just posted this video … which I’m sure will be of interest to microscope restorers and customisers.

https://youtu.be/y6BXE4uDW-Q

Happy experimenting !

MichaelG.
by MichaelG.
Sat Jan 20, 2024 7:16 pm
Forum: Microscopy accessories
Topic: Mystery Nikon Magnifier
Replies: 8
Views: 1122

Re: Mystery Nikon Magnifier

Thanks for that … I shall investigate further

MichaelG.
by MichaelG.
Sat Jan 20, 2024 5:32 pm
Forum: Microscopy accessories
Topic: Mystery Nikon Magnifier
Replies: 8
Views: 1122

Mystery Nikon Magnifier

I have a Nikon item which appears to be one of these: https://www.ebay.com/p/3037734298 https://www.ebay.com/itm/275027711597 Unfortunately, I have no idea what it is intended to fit … and strangely, although the lower lens element works as a very nice ‘magnifying glass’ … I haven’t found any settin...
by MichaelG.
Fri Jan 19, 2024 12:41 am
Forum: Microscopes and optics
Topic: How can I clean a concave lens?
Replies: 5
Views: 759

Re: How can I clean a concave lens?

.

In principle, the radius of curvature of your cleaning tool needs to be equal to, or less than, the curvature of the lens surface.
… In practice, this is getting worryingly close to being “a pointy thing” … so the answer is with great care and considerable finesse.

MichaelG.
by MichaelG.
Thu Jan 18, 2024 11:38 pm
Forum: Microscopes and optics
Topic: Leica M80 Plan Objective
Replies: 17
Views: 1699

Re: Leica M80 Plan Objective

.

A great success story … and a mystery solved for me !

I had often wondered what connection there was with the Royal Air Force :oops:

MichaelG.
by MichaelG.
Thu Jan 18, 2024 10:39 am
Forum: Microscopes and optics
Topic: What brand of traditional objectives do Chinese objectives mimic?
Replies: 10
Views: 1169

Re: What brand of traditional objectives do Chinese objectives mimic?

Thanks … I accept all the opinions

My point [badly made] was that there is a “Zeiss” microscope for which cheaper compatible Chinese objectives might be available.

MichaelG.
by MichaelG.
Thu Jan 18, 2024 8:39 am
Forum: Microscopes and optics
Topic: What brand of traditional objectives do Chinese objectives mimic?
Replies: 10
Views: 1169

Re: What brand of traditional objectives do Chinese objectives mimic?

Yes, I realise that … but it doesn’t stop it being a Zeiss product.
the affordable range of Zeiss microscopes
MichaelG.
by MichaelG.
Thu Jan 18, 2024 6:47 am
Forum: Beginner's corner
Topic: SW380B no illumination getting through the condenser
Replies: 7
Views: 995

Re: SW380B no illumination getting through the condenser

It tells you almost nothing … but I thought this very brief video worth sharing, for its glimpse of the manufacturing:
https://youtu.be/Xn--qBs0_p8?feature=shared

MichaelG.
by MichaelG.
Thu Jan 18, 2024 6:27 am
Forum: Microscopes and optics
Topic: What brand of traditional objectives do Chinese objectives mimic?
Replies: 10
Views: 1169

Re: What brand of traditional objectives do Chinese objectives mimic?

This is relavent to Chinese infinity microscopes only. […] I have not seen a Zeiss knockoff system from China […] That said … am I not right in believing that the affordable range of Zeiss microscopes is made by Motic ?? MichaelG. . Ref . https://www.microbehunter.com/microscopy-forum/viewtopic.php...
by MichaelG.
Wed Jan 17, 2024 5:31 pm
Forum: Beginner's corner
Topic: Swift SW380B objective lenses problem
Replies: 9
Views: 1132

Re: Swift SW380B objective lenses problem

… I just tried again to use the "short barrel" lens, but the SW380B only goes down so far, and I can't get anything except as shown in the photo. Strange, right? … . Just for the sake of curiosity … try putting a slide on a couple of spacers about 10mm high [stacks of coins would do] and then see i...
by MichaelG.
Wed Jan 17, 2024 1:26 pm
Forum: Beginner's corner
Topic: Swift SW380B objective lenses problem
Replies: 9
Views: 1132

Re: Swift SW380B objective lenses problem

Here’s a previous discussion, which might possibly be of interest:
viewtopic.php?t=7790

MichaelG.
by MichaelG.
Wed Jan 17, 2024 8:46 am
Forum: Beginner's corner
Topic: Swift SW380B objective lenses problem
Replies: 9
Views: 1132

Re: Swift SW380B objective lenses problem

I admit to being rather surprised that you can see no sign of an image at all … but this, by Oliver, is worth watching:
https://youtu.be/-4HzdclIW3A?feature=shared

MichaelG