Search found 138 matches

by Chris Dee
Thu Jul 02, 2020 7:33 pm
Forum: Pictures and Videos
Topic: Ascorbic Acid crystals
Replies: 2
Views: 365

Ascorbic Acid crystals

Ascorbic acid under polar illumination. Slides produced both with open evaporation of a saturated solution, and heat melted under a cover slip. Heat needs to be applied gradually when melting powdered ascorbic acid as it quickly decomposes if applied too rapidly. Crystals can take up to a week to fu...
by Chris Dee
Tue Jun 16, 2020 7:35 pm
Forum: Camera systems and imaging
Topic: battery adapter
Replies: 51
Views: 2379

Re: battery adapter

75RR the likely origin of this is your monitor's internal power supply. In order to achieve the voltages and switching speed needed the internal PSU has switching transformers which convert both voltage and frequency. If not properly filtered or the power supply is failing, high voltage, high frequ...
by Chris Dee
Tue Jun 16, 2020 3:46 pm
Forum: Camera systems and imaging
Topic: battery adapter
Replies: 51
Views: 2379

Re: battery adapter

75RR the likely origin of this is your monitor's internal power supply. In order to achieve the voltages and switching speed needed the internal PSU has switching transformers which convert both voltage and frequency. If not properly filtered or the power supply is failing, high voltage, high freque...
by Chris Dee
Sun May 24, 2020 7:28 am
Forum: Pictures and Videos
Topic: Menthol crystals
Replies: 3
Views: 149

Re: Menthol crystals

Menthol is a bit slower to form crystals than others I've tried 75RR. The uncovered samples are the quickest and can be observed growing but quite slowly. The covered samples are very slow to crystallise, this is day 2 and have only progressed marginally since the top image was taken.
by Chris Dee
Sun May 24, 2020 5:37 am
Forum: Pictures and Videos
Topic: Menthol crystals
Replies: 3
Views: 149

Menthol crystals

1st pic unmodified polarised illumination. Menthol dissolved in ethanol, a drop placed on slide and coverslip added. Crystals have formed around the edges of the coverslip and are now beginning to extend under the coverslip after 24hrs. This is a shot of that progression, I hope more will form in th...
by Chris Dee
Sun May 24, 2020 5:14 am
Forum: Pictures and Videos
Topic: Entomoneis alata
Replies: 12
Views: 418

Re: Entomoneis alata

Lovely detail and colours.
by Chris Dee
Sun May 24, 2020 5:12 am
Forum: Pictures and Videos
Topic: Hungry fella
Replies: 5
Views: 212

Re: Hungry fella

What an odd looking critter :) ID?
by Chris Dee
Fri May 22, 2020 4:20 pm
Forum: Pictures and Videos
Topic: Citric Acid
Replies: 1
Views: 104

Citric Acid

Dissolved in isopropyl alcohol. Polarised illumination using cheap plastic film for the upper filter, and a linear camera lens filter over the illuminator.
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Objective: Zeiss Jena 6.3x apo
Microscope: Vickers M17
NFK 3.3x photo eyepiece
by Chris Dee
Fri May 22, 2020 4:09 pm
Forum: Pictures and Videos
Topic: Vorticella
Replies: 7
Views: 364

Re: Vorticella

Nice work, thanks for sharing.
by Chris Dee
Wed May 13, 2020 2:43 pm
Forum: Microscopes and optics
Topic: De-doming (shaving) LED's
Replies: 7
Views: 656

Re: De-doming (shaving) LED's

Yes Bob this mod would have little benefit in illumination systems with a fixed diffuser in the light path, possibly a marginal increase in brightness. The example above is also a worst case scenario for the (full Kohler) illumination on my microscope, normally the diffuser would be deployed at 4x a...
by Chris Dee
Mon May 11, 2020 3:30 pm
Forum: Specimens, samples and slides
Topic: My Arachnoidiscus
Replies: 9
Views: 1033

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.
by Chris Dee
Mon May 11, 2020 3:06 pm
Forum: Microscopes and optics
Topic: De-doming (shaving) LED's
Replies: 7
Views: 656

Re: De-doming (shaving) LED's

MichaelG, thanks. Yes my fingers survived without laceration, coffee drunk after the shaving ;)

Hobbyst46 Yes its taken from a slide I made of Hypochaeris radicata pappus stained with Methyl Red. Thanks for the info on historical LED de-doming, no doubt where this all originated from.
by Chris Dee
Mon May 11, 2020 2:50 pm
Forum: Microscopes and optics
Topic: De-doming (shaving) LED's
Replies: 7
Views: 656

Re: De-doming (shaving) LED's

As a side note I've recently been using UV-LOCA TP-2500F Glue for slide mounting subjects. This is a UV curing glue used for mounting screen covers on mobile phones and tablets. So far it is working very well. It doesn't harden fully so care needs to be taken with the amount used to avoid flooding o...
by Chris Dee
Mon May 11, 2020 2:34 pm
Forum: Microscopes and optics
Topic: De-doming (shaving) LED's
Replies: 7
Views: 656

De-doming (shaving) LED's

A while ago I bought a few high power Cree LED's and tested them while refurbishing a Vickers M17 microscope. I found the Cree XHP35 to have the most even phosphorous distribution and light pattern. Its a single die 12v LED with a die size of 3.45 x 3.45mm which closely matched the original filament...
by Chris Dee
Tue May 05, 2020 8:42 pm
Forum: Beginner's corner
Topic: Info on my objective please
Replies: 3
Views: 447

Re: Info on my objective please

The GS logo is 'Gillette and Siebert'. They were a UK company who produced good quality microscopes up until the late 80's. Their microscopes were mainly assembled from outsourced EU production parts. I have one of their scopes and the objectives are achromats like your example. I'm sure someone her...
by Chris Dee
Mon May 04, 2020 10:31 pm
Forum: Pictures and Videos
Topic: Phantom Midge Chaoborus crystallinus
Replies: 8
Views: 632

Re: Phantom Midge Chaoborus crystallinus

Very nice, well done.Was the specimen mounted or just a wet slide?
by Chris Dee
Mon May 04, 2020 10:27 pm
Forum: Pictures and Videos
Topic: Actinocyclus subtilis
Replies: 18
Views: 1114

Re: Actinocyclus subtilis

Fantastic images.
by Chris Dee
Mon May 04, 2020 10:15 pm
Forum: Pictures and Videos
Topic: Vaginicola
Replies: 10
Views: 1163

Re: Vaginicola

Lovely video, well done.
by Chris Dee
Mon May 04, 2020 10:11 pm
Forum: Microscopy accessories
Topic: Canon M50 limitations
Replies: 21
Views: 1385

Re: Canon M50 limitations

Scarodactyl, I don't use it always but it is useful sometimes for positioning a moving object (eyepiece is widefield, image is cropped), checking focus when adjusting a 40x collar, that sort of thing. I like to be able to glance up from the eyepiece and see what the camera is seeing. Michael I sugg...
by Chris Dee
Sun May 03, 2020 1:10 am
Forum: Microscopy accessories
Topic: Canon M50 limitations
Replies: 21
Views: 1385

Re: Canon M50 limitations

I ordered an M50 2 days ago and awaiting arrival. I did my research and understood the camera can be triggered via EOS Utility 3 and USB tethering (as geo_man has working). My ageing 550D works flawlessly this way. The loss of a second trigger method isn't a concern, but I will be annoyed if Canon's...
by Chris Dee
Sat May 02, 2020 12:43 pm
Forum: Camera systems and imaging
Topic: battery adapter
Replies: 51
Views: 2379

Re: battery adapter

Try this link (UK eBay, but should ship to Spain as its a Chinese seller): https://www.ebay.co.uk/itm/AC-Power-Ada ... SwBBpbrPXA
by Chris Dee
Sat May 02, 2020 12:22 pm
Forum: Camera systems and imaging
Topic: battery adapter
Replies: 51
Views: 2379

Re: battery adapter

eBay item number 323470694306
HTH.
by Chris Dee
Sat May 02, 2020 12:08 pm
Forum: Identification help
Topic: What microbe is this?
Replies: 2
Views: 575

Re: What microbe is this?

Hard to be certain, but looks like Colpodea.
by Chris Dee
Wed Apr 29, 2020 11:51 am
Forum: Pictures and Videos
Topic: Micro stonemasons. Difflugia.
Replies: 21
Views: 2141

Re: Micro stonemasons. Difflugia.

Chris... I got the 90D because I want a higher resolution APS-C; a fully electronic shutter from live-view; and I wanted a camera that could do a quick focus stack sequence when used outdoors or for lower magnification close-ups. It does all three. Like all other cameras it is not "perfect", but th...
by Chris Dee
Tue Apr 28, 2020 11:29 am
Forum: Pictures and Videos
Topic: Paramecium bursaria
Replies: 10
Views: 1104

Re: Paramecium bursaria

Well done Wes, another stunner.
by Chris Dee
Tue Apr 28, 2020 11:26 am
Forum: Pictures and Videos
Topic: A documentation of a beautiful Rotifer colony!
Replies: 6
Views: 855

Re: A documentation of a beautiful Rotifer colony!

Well done Karl, lovely to watch. Congrats on finding a complete colony to study, I've yet to find one. Thanks for sharing.
by Chris Dee
Tue Apr 28, 2020 11:14 am
Forum: Pictures and Videos
Topic: Micro stonemasons. Difflugia.
Replies: 21
Views: 2141

Re: Micro stonemasons. Difflugia.

Great images and subject treatment. Are you happy with the Canon 90D? I'm considering buying one, any downsides?
by Chris Dee
Sun Apr 26, 2020 9:08 pm
Forum: Pictures and Videos
Topic: Elastic Stentor
Replies: 7
Views: 1033

Re: Elastic Stentor

Thanks for the kind words all. The critter tank has seen a rise in numbers with the longer daylight hours.
by Chris Dee
Sun Apr 26, 2020 9:03 pm
Forum: Illumination Techniques
Topic: Interesting DIC-like effect
Replies: 5
Views: 1170

Re: Interesting DIC-like effect

I just saw that you use a Vickers microscope! I have a good impression from them but very few poeple seem to actually use one. Bob Thanks for the reply. I'm really enjoying the Vickers M17 Bob, well worth the effort restoring it. Very heavy, no plastic gears, and a generous field of view. Despite h...