My old black Cogit
My old black Cogit
As a hobby brewer, I use an old Cogit microscope to check our yeast. Cogit was probably not a maker, they just stamped they name on basics microscopes.
This microscope is composed of a black stand, XY table. Abbe condenser and iris diaphragme, filter holder. Mirror two faces.
4 objectives 7X, 45X, 80X and 120 oil immersion. Eyepieces 5, 6, 10, 12 and a new WF 16. As an improvement, I managed to get a led lightning between the legs of the stand. Looking through the eyepiece was a little akward for "my old neck" so I added a tablet in afocal position. Now I can zoom on the tablet screen and share the view with my "Buddies Brewers". I hope you can understand my poor gibberish. If it is ok some yeast pictures will come later.
Of course any comment or critiscisme are welcome.
Joël UGHETTO
This microscope is composed of a black stand, XY table. Abbe condenser and iris diaphragme, filter holder. Mirror two faces.
4 objectives 7X, 45X, 80X and 120 oil immersion. Eyepieces 5, 6, 10, 12 and a new WF 16. As an improvement, I managed to get a led lightning between the legs of the stand. Looking through the eyepiece was a little akward for "my old neck" so I added a tablet in afocal position. Now I can zoom on the tablet screen and share the view with my "Buddies Brewers". I hope you can understand my poor gibberish. If it is ok some yeast pictures will come later.
Of course any comment or critiscisme are welcome.
Joël UGHETTO
Re: My old black Cogit
Nice microscope setup, Joël!
These horse shoe microscopes are not often used today which is a pity as they perform very well, even for photography. Your setup for the tablet is very ingenious and a good idea to copy for people who can't look through eyepieces very well.
Bob
These horse shoe microscopes are not often used today which is a pity as they perform very well, even for photography. Your setup for the tablet is very ingenious and a good idea to copy for people who can't look through eyepieces very well.
Bob
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Re: My old black Cogit
Using the camera on the tablet by fitting a box under it is very ingenious.
Re: My old black Cogit
Nice setup, what is the LED driver you are using? Looks similar to a handy little $7 square wave/PWM signal generator board I got recently but with built-in LED drive circuitry?
Re: My old black Cogit
Thank you for your comments.
This microscope and all the stuff around is used to show "tiny things" to the Members of our Brewers Association. It has to be easy to move by car from my home to the Brewery, not take a long time to adjust and the ...experiments must be bulletproof. The Members have different levels of study and very often come with their Children. Each session involves 6 or 7 people hence the tablet : children in front and parents behind so that everyone can see the show !
During those sessions we look at a hair to show them that if you cannot see through ... the microscope is not that usefull, half of them prepare a slide with their own cheek cell with and without staining it, the other half a piece of onion skin epidermal stained by iodine. We prepare some yeast stained by methylen blue to play "Wanted dead or alive" and check wether our yeast is ok to ferment the next batch or not. As Brewers, we fear infections and they always want to see bacteria ... Not so easy, they have to collect with a toothpeek some "white stuff" at the foot of one of their own teeth and prepare the slide. Recording a video of the bacteria moving around always frighten them a little. "This is in MY mouth ??? NO .... impossible !!!".
With some red onions epidermis we look at the plasmolysis ( sometime reversible) by adding some brine (thank you Microbhunter microscopy). This experiment shows to our Brewers that throwing some yeast in a concentrated wort (Barley wine) could lead to some problems and stress the yeast.
End of the show, their eyes should shine... I am exhausted but happy.
I will post some photo.. But they are probably useless for you.
Hans, you are right it is a small PWM signal generator. The led radiator is a piece of copper tubing flattened and the light diffuser ... A piece of table tennis ball glued on the radiator.
MicroBob : In my case the bottleneck is not the microscope, it is the guy sitting in front of it
Joël UGHETTO
This microscope and all the stuff around is used to show "tiny things" to the Members of our Brewers Association. It has to be easy to move by car from my home to the Brewery, not take a long time to adjust and the ...experiments must be bulletproof. The Members have different levels of study and very often come with their Children. Each session involves 6 or 7 people hence the tablet : children in front and parents behind so that everyone can see the show !
During those sessions we look at a hair to show them that if you cannot see through ... the microscope is not that usefull, half of them prepare a slide with their own cheek cell with and without staining it, the other half a piece of onion skin epidermal stained by iodine. We prepare some yeast stained by methylen blue to play "Wanted dead or alive" and check wether our yeast is ok to ferment the next batch or not. As Brewers, we fear infections and they always want to see bacteria ... Not so easy, they have to collect with a toothpeek some "white stuff" at the foot of one of their own teeth and prepare the slide. Recording a video of the bacteria moving around always frighten them a little. "This is in MY mouth ??? NO .... impossible !!!".
With some red onions epidermis we look at the plasmolysis ( sometime reversible) by adding some brine (thank you Microbhunter microscopy). This experiment shows to our Brewers that throwing some yeast in a concentrated wort (Barley wine) could lead to some problems and stress the yeast.
End of the show, their eyes should shine... I am exhausted but happy.
I will post some photo.. But they are probably useless for you.
Hans, you are right it is a small PWM signal generator. The led radiator is a piece of copper tubing flattened and the light diffuser ... A piece of table tennis ball glued on the radiator.
MicroBob : In my case the bottleneck is not the microscope, it is the guy sitting in front of it
Joël UGHETTO
Re: My old black Cogit
Really like the tablet setup
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Re: My old black Cogit
Very good to see a beautiful old microscope still doing it's duty. Does it image genetically modified brewer's yeast as well as the generations old strains?
Cogit was a French brand of microscope but made in Germany for the French market. It probably was made by Seibert. The objective lens barrels on your microscope with the double flat knurled grip rings are identical to Seibert objectives I have seen. Might be Leitz that made the stand. Apparently , Seibert did a lot of contract work and for Leitz too.
Cogit was a French brand of microscope but made in Germany for the French market. It probably was made by Seibert. The objective lens barrels on your microscope with the double flat knurled grip rings are identical to Seibert objectives I have seen. Might be Leitz that made the stand. Apparently , Seibert did a lot of contract work and for Leitz too.
Re: My old black Cogit
It is really easy to setup a tablet on any monocular microscope. There is no physical contact between the microscope and the tablet, no vibration on the microscope when you zoom on the screen tablet. The tablet moves on the x,y plan only. On the z axis, I just pull the microscope tube up or down if I change the eyepiece. The screen is larger than the smartphones one.
Re: My old black Cogit
Thank you very much for those precisions. It looks like Cogit was retailer and depositary (not sure it is the right word) for Leitz in France :apochronaut wrote: ↑Wed Mar 03, 2021 11:52 pmCogit was a French brand of microscope but made in Germany for the French market. It probably was made by Seibert. The objective lens barrels on your microscope with the double flat knurled grip rings are identical to Seibert objectives I have seen. Might be Leitz that made the stand. Apparently , Seibert did a lot of contract work and for Leitz too.
http://www.lecompendium.com/dossier_opt ... _cogit.htm
The 4 objectives (20x, 45x, 80x, and 120x oil immersion) have the same shape and are parfocal. Joël UGHETTO