darkfield is when the scattered light is observed and no light passes direct from the lightsource to the observer. This can be also achieved with a stereo-mikroscop.  If you have  translucend illuminater and a darkfield condensor under the object or you are illuminatinn oblique from above or side. Putting only a dark background is absolutly no darkfield illumination.

Hi from Australia

I'm late but Hello from Tennessee

The reason you are not satisfied with your camera adapter, is that your camera's sensor diagonal is a lot smaller, than the projected image. You could fix this two ways: 1) buy an adjustable camera adapter,  but be careful, there are crappy ones out there; 2) buy a new camera, for example Touptek E3ISPM08300KPE, with the IMX678 sensor. The diagonal of that camera sensor is 8.8 mm, so the 0.5x fixed magnification adapter will only waste a bit (0.2 mm x2) of FOV.

Hey Mr. Microscope Guy, Did you know that Youtube is 3D Compatible and if you put 2 Camera's on that 40x Stereoscope then People with a 3D compatible T.V. can actually see that in 3D and even if they do not have a 3D T.V. they can see thru that Low Power Stereo Microscope ya got there with the Red Blue Glasses.  Yep they sure can and it works and I have Verified that it works on youtube over a Decade ago.  
If you have any other Developer, Science, Engineering, etc... Questions,
Just gimme a shout and I will be glad to straighten ya out.
Have a Great Day.

Good job Oliver👍 I have just purchased my first Stereoscope & and getting into this hobby. I have been using your channel for my main education. Your information has not failed me yet. If you are just starting out then Oliver is your man👍😎

👍

Omano CAS-39 DSLP adapter video was great, however, I cannot find it on Ail express, Amazon nor Ebay. Where did you find it? Insects can be anesthetized temporarily using carbon dioxide which is heavier than air so can cover the insect in a jar. (So how does CO2 make a blanket in the troposphere?) Or by cooling the insect in the fridge. Tom of Montana

What is your stereo microscope brand?

Hi can I ask a question can use the nucleus of a cell or cell structure also is there a filter that makes everything dark except cell structures (nucleus, cell membrane) etc...


Also why don't you make a new channel that teaches biology (microbiology, cells etc) and physics of the microscope

Hi Oliver how are you I wanted to ask  a question I am very confused about stereo and compound microscopes which one I choose for example
I want both functions
sw150 is a compound microscope with top light can it work like a stereo microscope or I buy it with another device USB
microscope.

Also, can you tell me the types of filters in microscopes and if is it possible to make them?

You really deserve more than this

THANK YOU