Camlab have a wide variety of cameras to choose from that fit most microscopes with a C-mount. The adaptor tubes should be specific to the microscope and should be ordered from the manufacturer.
Optika cameras are very easy to use and produce very impressive images whether its a budget range camera or the HDMI version.
At a glance:
Optikam Budget Series: USB Cameras for general purpose imaging with software included.

Optikam Pro Series: High performance cameras with advanced software packages.
C mount cameras for video and still-image capturing with high performance. These cameras are delivered with the complete Optika Vision Software package.

Optikam Pro HDMI: Pro HDMI PC-TV camera with software included.
Digital camera equipped with 6 MPixel camera, 2Gb internal memory, C mount connection and dual USB/HDMI port. This system provides live video imaging in high definition full HD1080p, and the ability to record photos and videos directly onto a 2GB SD card which is included, or to connect to a PC.

TB Series: Tablet PC with C mount integrated camera software included.
A 2 in 1 solution. A tablet PC with 10″ LCD touch screen, in combination with either a 3 or 5 MPixel camera.

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