MicrobeHunter.com Microscopy Forum

... from today’s News : https://metro.co.uk/2020/12/24/a-flower-from-the-time-of-the-dinosaurs-has-survived-frozen-in-amber-13799490/ MichaelG. . https://www.researchgate.net/publication/347064157_Valviloculus_pleristaminis_gen_et_sp_nov_a_Lauralean_fossil_flower_with_valvate_anthers_from_mid-Cretac...

That looks very tidy

https://www.euromex.com/en/products/app ... gy/iscope/

[ says he with a vast collection of mis-matched bits & pieces ]

MichaelG.

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Unfortunately, there are known problems with Big Sur [as recently mentioned]
viewtopic.php?f=9&t=11156&p=92933&hilit=big+sur#p92933

Hopefully Apple will catch-up !!

MichaelG.

This should give you some archive images of the M15 to drool over:
https://dlib.york.ac.uk/yodl/app/image/ ... ickers+m15

MichaelG.

That Vickers looks very promising ... and the M15 is an excellent instrument.

MichaelG.

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Excellent image, Saul
... looks like fungus, but I don’t know enough to identify it.

[ Aspergillus niger seems a likely candidate though ]

MichaelG.
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http://website.nbm-mnb.ca/mycologywebpa ... allus.html
https://en.wikipedia.org/wiki/Aspergillus_niger

Curiously enough :
. .

MichaelG.

May the Force be with you, Hans

MichaelG.

... but the ‘kit lens’ for my older model [G1] is 14-45mm Have you tried afocal with that one? I had seen it on some older models but was considering it not very promising […] . No, I have never bothered ... There seems to be no convenient way of pre-setting the focus to infinity [or thereabouts], ...

For convenience ... This page is in English, and includes citations, etc. https://patents.google.com/patent/DE19514358C2/en Google's translation has quite a few strange phrasings. I was getting somewhat less confusing results pasting the OCRed text from Espacenet into DeepL that 75RR mentioned. I n...

Gut feeling is that 32mm might be a a little short for the job, but I may be wrong. It is a Micro Four Thirds lens so I think the zoom range could work nicely if vignetting is not a problem. […] . Yes, I realise that it is a Micro Four Thirds lens ... but the ‘kit lens’ for my older model [G1] is 1...

The Thorlabs diagram does not explicitly show whether the mask/diffuser are conjugate with the objective read focal plane, but since they are in a region where the field stop is shown collimated, I don't think there is any contradiction? . Perhaps we are at cross-purposes, Hans ... in which case, I...

microbear wrote: ↑

Thu Dec 17, 2020 8:08 pm

Yes, I'm a german scientist. I think they filed a US patent as well and google also has a translation.

For convenience ... This page is in English, and includes citations, etc.
https://patents.google.com/patent/DE19514358C2/en

MichaelG.

Excellent image !! Just one thought [aside from the interesting choice of colour] ... As shown, all the cells appear to be cavities, but I presume you didn’t actually section them ! Would you agree with me, that it looks more realistic when rotated 180° ? DD34E204-5C3F-48B5-ACBC-AB486CE821BC.jpeg Mi...

There is also some discussion of the Thorlabs Dodt module in this thread: http://www.microbehunter.com/microscopy-forum/viewtopic.php?f=28&t=10964 Yes, I have been following that thread with interest ... which is why I knew where to find appropriate credit for the image. On the technical point : I ...

Sorry, Hans ... I don’t have that lens
Gut feeling is that 32mm might be a a little short for the job, but I may be wrong.

There’s a fairly detailed review of it here: https://www.imaging-resource.com/lenses ... io/review/

MichaelG.

Looking at the Thorlabs text ... this statement is obviously relevant: The rotating knob on the front controls an integrated field stop diaphragm, which can be used to adjust the illumination intensity and match the back aperture of a condenser. ... and supports my comment that: It would probably be...

I think, for diagrams like that, the field stop is dimensioned and positioned to not overfill the collimating lens.

It would probably be easier if you work backwards through the system.

MichaelG.

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Very probably

[ the dash usually means “not fussy” ]

MichaelG.

I’ve just found this : https://www.scientifica.uk.com/learning-zone/dodt-gradient-contrast Not studied it yet ... my Caffeine level needs boosting MichaelG. That was the second link in the first post. You DO need coffee! . My apologies :oops: MichaelG. . Edit: Clever chap, Herr Dodt https://www.res...

I don't have any afocal lenses. A few primes and zooms, none of which I would expect to be of any use for this. . A prime lens, focussed at, or near, infinity is used for ‘afocal’ photomicrography ... it simply photographs the output from the eyepiece. There are many threads on the forum that discu...

I’ve just found this : https://www.scientifica.uk.com/learning ... t-contrast

Not studied it yet ... my Caffeine level needs boosting

MichaelG.

hans wrote: ↑

Thu Dec 17, 2020 3:56 am

Drawing is pretty different compared to this one […]

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True

MichaelG.

I finally broke down and bought the manual or $10. I've been trying to share it but whether I try to insert the PDF or docx file I get the message that the file is to large. Is there a way around this? . Do you have a Dropbox account ? ... https://www.dropbox.com/en_GB/basic ... If so, it is a simp...

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There may be some hope:

Have a look at section 6.9 of this
https://lavinia.as.arizona.edu/~mtuell/ ... w%20en.pdf
... and then this
https://www.theimagingsource.com/suppor ... ctwainwdm/

MichaelG.

Yeah, I'm not having high hopes for the IS cameras. But I was thinking that it might support UVC. What does it support actually? Direct Show? How does it detect Touptek cams? Sorry, I don’t know the details ... but basically, I believe it polls the USB port and requires a hardware identifier for a ...

Almost certainly then ... the answer is No Imaging Source cameras seem to be very fussy about what they will work with, and I don’t think ToupView will accept UVC cameras. ... It is just possible, however, that ToupView might behave like Motic Images Plus, and let you use a UVC camera as a second so...

I suppose that would depend upon what you mean by ‘regular cameras’ Mike

What are you wanting to use ?

MichaelG.

This patent is too clever for me to fully comprehend, but I think it may be relevant to the SZ7
https://worldwide.espacenet.com/patent/ ... DGB988120A

Note the paragraph commencing page_2 line_114

MichaelG.

Thanks for that ... very useful

MichaelG.