Search found 176 matches

by photomicro
Sat Nov 28, 2020 11:44 am
Forum: Microscopes and optics
Topic: LWD objective on 0.18 cover slip slide.
Replies: 15
Views: 202

Re: LWD objective on 0.18 cover slip slide.

Hi, I just started and made a silly problem. Instead of buying a finite 20x 160/0.17 I bought a finite LPL LWD 25x 160/1.5. What is the compromise of using this instead of the one for 0.17 cover slip? My intention is using it to capture crystal on slide, watch some dyed slide or slide without cover...
by photomicro
Tue Nov 10, 2020 1:22 pm
Forum: Pictures and Videos
Topic: Vintage diatom slides
Replies: 29
Views: 840

Re: Vintage diatom slides

Photographed with a x10 objective, bright-field, using a M4/3 camera. How are you getting such high contrast and lack of color? What type of condenser? To answer an earlier question, the objective is a x10 Planapo high NA for that magnification, of 0,5. Lack of colour...if the NA is higher, you get...
by photomicro
Sun Nov 08, 2020 3:03 pm
Forum: Pictures and Videos
Topic: Vintage diatom slides
Replies: 29
Views: 840

Re: Vintage diatom slides

More details...the slide is also a vintage one, labelled as Smith, Beck and Beck, at 6 Coleman Street, where they were from 1857 to 1865 so very old. There are three frustules on the slide. This was the largest. Whilst it is labelled Aulacodiscus oreganus the same as the OPs slide, it is clearly not...
by photomicro
Sat Nov 07, 2020 8:31 pm
Forum: Pictures and Videos
Topic: Vintage diatom slides
Replies: 29
Views: 840

Re: Vintage diatom slides

Not the same species, but similar.

Taken with a x10, which has greater depth of field.

Cropped, to be comparable.

Food for thought.
A o.jpg
A o.jpg (212.77 KiB) Viewed 709 times
by photomicro
Sun Sep 06, 2020 2:16 pm
Forum: Introduce yourself
Topic: Hello from England
Replies: 4
Views: 631

Re: Hello from England

MikeUK wrote:
Thu Sep 03, 2020 4:58 pm
Thanks folks!

@photomicro apologies, I can't seem to respond to your PM, presumably because of my low post count. I am from Peterborough, Cambridgeshire.

Thanks again for the welcome.
No problem, you will in time. My message was to do with amateur groups here in the UK.
by photomicro
Thu Jul 30, 2020 9:17 am
Forum: For forum members who want to buy and sell equipment
Topic: Zeiss Ultraphot II, instruction booklet
Replies: 1
Views: 500

Zeiss Ultraphot II, instruction booklet

In searching through a large pile of literature, I found an original copy of the (A5-ish) 92 page instruction booklet for the Zeiss (West) Ultraphot II, dated 1967.

This is free to a good home, for just the cost of postage (from UK) but is in German.
by photomicro
Fri Jul 24, 2020 8:57 am
Forum: Specimens, samples and slides
Topic: The Importance of Proper Slide Storage
Replies: 8
Views: 1581

Re: The Importance of Proper Slide Storage

Along the same lines, I was going through the very large cabinet of a well-respected mounter of recent times, now not with us, and discovered one or two of his larger dry mounts that had lost their 'cells'. As you can see, the result has been rather drastic ! store properly.jpeg Then I found another...
by photomicro
Wed Jul 15, 2020 8:23 am
Forum: Introduce yourself
Topic: Hello from Wales
Replies: 4
Views: 745

Re: Hello from Wales

hello Mike welcome to the forum, but also to the fact that there is also an active amateur microscopy community here within the UK. Some are 'national' and some more local. Depends where you live in Wales, but there are active members in Pembrokeshire, and two meetings a year over the border in Staf...
by photomicro
Wed Jul 08, 2020 1:03 pm
Forum: Microscopes and optics
Topic: Euromex or Motic?
Replies: 60
Views: 4725

Re: Euromex or Motic?

Have sent PM, but not sure if you have been a member long enough.
by photomicro
Thu Jul 02, 2020 8:10 am
Forum: Microscopes and optics
Topic: Dovetail on the bottom of a BH2 1.25 condenser. 
Replies: 2
Views: 453

Re: Dovetail on the bottom of a BH2 1.25 condenser. 

It might be worth mentioning that the Nikon and Olympus dovetails are very similar, with the Nikon being slightly smaller. Hence, a Nikon condenser will fit an Olympus stand, but not vice-versa. There are a *lot* of similarities between say the BH2 and Optiphot (and others) stands of these two maker...
by photomicro
Mon Jun 22, 2020 8:45 am
Forum: Camera systems and imaging
Topic: Microstar IV Camera Setup
Replies: 18
Views: 3344

Re: Microstar IV Camera Setup

I can't find any reference to *what* eyepiece is being used in the afocal method...
by photomicro
Fri Jun 19, 2020 1:45 pm
Forum: Specimens, samples and slides
Topic: Diatom Mounting Medium Hunt
Replies: 21
Views: 3698

Re: Diatom Mounting Medium Hunt

I can provide small quantities of the following for interested amateurs;

Pleurax (in alcohol)

Naphrax (in toluene)

Filtered Storax (in chloroform)


You need to PM me to enquire. Sending from the UK.
by photomicro
Thu Jun 04, 2020 6:40 pm
Forum: Introduce yourself
Topic: Hello from Sunny Wiltshire
Replies: 7
Views: 1022

Re: Hello from Sunny Wiltshire

Excuse the ignorance Hobbyst46, but what did you mean by "field aperture"? Thank you for the information on the book by Hall and Linssen. I love old books on anything to do with practical Science. There's so much in them that has been lost even if some of the chemicals used wouldn't be allowed in m...
by photomicro
Thu Jun 04, 2020 3:52 pm
Forum: Introduce yourself
Topic: Hello from Sunny Wiltshire
Replies: 7
Views: 1022

Re: Hello from Sunny Wiltshire

I have a brochure for this microscope, and the May 1967 price list, when prices were quoted in pounds, shillings and pence. As I recall it was billed as a laboratory microscope with research capabilities. Yours is shown with the mains voltage illuminator, yet has the rheostat control which normally ...
by photomicro
Wed May 27, 2020 10:50 am
Forum: Articles and images to be published
Topic: Making Permanent Microscope Slides of Insects
Replies: 3
Views: 3224

Re: Making Permanent Microscope Slides of Insects

There was quite a bit on this subject within the booklets published by NBS (Northern Biological Supplies) in the UK in the 1970s. These were done by Eric Marson, and can often be picked up as separate booklets on each topic, or as a bound volume of all 17 booklets. Eric taught a great deal, and tuto...
by photomicro
Fri May 15, 2020 8:38 am
Forum: Specimens, samples and slides
Topic: My Arachnoidiscus
Replies: 9
Views: 1713

Re: My Arachnoidiscus

Nicely imaged grouping photomicro, what objective did you use? Perhaps it is because I don't have DIC at present, though I used to ... What is the story there? Upgrading to an infinity system? Used a x20 objective. This is VAC, or variable amplitude contrast, which is easily made for any stand. In ...
by photomicro
Thu May 14, 2020 6:48 pm
Forum: Specimens, samples and slides
Topic: My Arachnoidiscus
Replies: 9
Views: 1713

Re: My Arachnoidiscus

Lovely oblique/brightfield images. I know DIC is often the desired method for these subjects, but I still much prefer this type of shot. Thanks for sharing. I agree, I like this kind of method too. Perhaps it is because I don't have DIC at present, though I used to, but it does seem to work nicely ...
by photomicro
Wed May 13, 2020 10:43 am
Forum: Microscopes and optics
Topic: Optiphot nose piece question
Replies: 13
Views: 2410

Re: Optiphot nose piece question

As requested/promised, photos of my nosepieces and the optiphot limb/head detail mentioned in earlier reply. DSC05571.jpg DSC05570.jpg DSC05568.jpg DSC05565.jpg HOW DO YOU REMOVE COMPLETELY THE NOSEPIECE AS ILLUSTRATED ON THE FIRST PICTURE!? I’m on a cleaning spree of my Labophot & I’ve never been ...
by photomicro
Sun May 03, 2020 9:58 am
Forum: Illumination Techniques
Topic: Leica Integrated Modulation Contrast (Variant of Hoffman)
Replies: 7
Views: 1719

Re: Leica Integrated Modulation Contrast (Variant of Hoffman)

Whoops, I had it wrong about the small ND filter part of the smaller slider; it is actually a glass disk that covers the entire hole. On it are plated the areas of 15% and 1%, the rest left clear. I can't say about your microscope. What make and model is it? What is the triangular filter for? edit:...
by photomicro
Wed Apr 29, 2020 10:29 am
Forum: For forum members who want to buy and sell equipment
Topic: Wanted: Stereo scope - perhaps Nikon SMZ10?
Replies: 5
Views: 1248

Re: Wanted: Stereo scope - perhaps Nikon SMZ10?

PM sent, though as a new user, you may not be able to receive.
by photomicro
Fri Apr 24, 2020 7:55 am
Forum: Off Topic
Topic: Please opine source, time term 'coined'...diatom twitching?
Replies: 4
Views: 2138

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

Non-UK based folk may especially be both informed and amused by this, which happened to be on Radio 3 last night !

(always assuming they can link to it)


https://www.bbc.co.uk/programmes/b0b1q2f5
by photomicro
Thu Apr 23, 2020 8:08 am
Forum: Beginner's corner
Topic: Can i use lomo KF- 4 phase condenser with leitz phase objectives?
Replies: 2
Views: 688

Re: Can i use lomo KF- 4 phase condenser with leitz phase objectives?

The bottom line is that if it physically fits your microscope, then it will work, but whether any of the phase annuli will match in size with the phase rings in the Leitz objectives is another thing. As it is, I am rather surprised the Leitz objectives work on this stand. The stand was designed for ...
by photomicro
Wed Apr 22, 2020 11:22 am
Forum: Microscopes and optics
Topic: Olympus BH-2 question
Replies: 8
Views: 1151

Re: Olympus BH-2 question

I *think* they made a 'plug-in' filter, like the one shown in the pictures. I have no idea what make this is. This is a blue filter, but can support other discs such as stops. Of course whether this is the ideal place for such a stop depends on the design of the condenser. Another forum member also ...
by photomicro
Mon Apr 20, 2020 4:29 pm
Forum: Illumination Techniques
Topic: PDFs of the VAC articles/papers?
Replies: 2
Views: 804

Re: PDFs of the VAC articles/papers?

PM me.

Mike
by photomicro
Mon Apr 06, 2020 5:43 pm
Forum: Beginner's corner
Topic: Kohler Trouble
Replies: 40
Views: 3463

Re: Kohler Trouble

It does, it's held in by one screw. https://i.imgur.com/sb4jELp.jpg I am not yet sure what exactly is causing the unlevel stage because I don't have another BH-2 to see how it "should" fit. I suspect the screw *should* fit lower into the dovetail, not on the top like it is. The screw also does not ...
by photomicro
Mon Apr 06, 2020 2:18 pm
Forum: Beginner's corner
Topic: Kohler Trouble
Replies: 40
Views: 3463

Re: Kohler Trouble

Don't own an Olympus BH2, but as a 12v 100 watt Halogen puts out a lot of light (particularly as in order to maintain/extend bulb life it should be kept within a 9-11 volt range), it would make sense that it should have an ND filter for most observations and that it be removed for say high magnific...
by photomicro
Mon Apr 06, 2020 11:43 am
Forum: Microscopes and optics
Topic: Intriguing objective
Replies: 10
Views: 1150

Re: Intriguing objective

Can’t remember where I saw it but recently saw a photo of a Zeiss objective-probably from neofluar era by the look of it but was changeable from 1.6x to 5x via collar-has anyone used this particular objective?-maybe there’s a downside to it but an appealing idea-to have all your lower mags provided...
by photomicro
Fri Apr 03, 2020 10:04 am
Forum: Introduce yourself
Topic: diatoms
Replies: 11
Views: 1438

Re: diatoms

Hi Mike, thank you for the link! This booklet also contains the description of the little field microscope that would be useful for diatom collecting. Here is a link to a detailed research on diatom refractive indices: http://www.mikroskopie-ph.de/Mikrokosmos,%20Band%2098%282%29,%20S.%2098%20%28200...
by photomicro
Thu Apr 02, 2020 7:13 pm
Forum: Introduce yourself
Topic: diatoms
Replies: 11
Views: 1438

Re: diatoms

Hi Frank, diatoms are basically transparent and have a refractive index around 1,45. To get a contrasty image a difference of the refractive index of the mountant of 0,1 is recommended. This doesn't necessarily mean that it has to be higher though. Diatoms in air give lots of contrast but you can't...
by photomicro
Thu Apr 02, 2020 9:09 am
Forum: For forum members who want to buy and sell equipment
Topic: Stereomicroscope Help
Replies: 10
Views: 1386

Re: Stereomicroscope Help

Quoting your budget in pounds, and looking at Brunel, implies that you are UK based.

If you want to PM me, I can probably help out, having had a couple of dozen such stands through my hands in the last few years (occupational hazard) and am also UK based.

Mike