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How to simply and securely attach the LM digital adapter to phototubes with an internal diameter of 23.2 mm and an external diameter of 25.3 mm using the TUSTB tube adapter 

Many microscopes are offered with phototubes that have an internal diameter of 23.2 mm. If you want to use a digital camera with a microscope of this kind, then you need an LM digital microscope adapter with a 23.2 mm tube connector.

The LM digital adapter is inserted into the tube along with the camera. The assembly is then immediately ready to use. The first image shows a digital SLR camera in use; the second image a USB camera in use.

In both solutions, the adapter fits into the phototube and can be rotated manually. For a fixed mechanical connection, we offer another adapter – the TUSTB – as an option. 

The TUSTB consists of a CNC cut and turned aluminium block and has six Allen head screws. A suitable Allen screw key is included with the purchase of the TUSTB. It connects the LM digital adapter to the phototube of the microscope. By tightening the Allen screws, the adapter can be fastened to the phototube so that no more play (rotation) is possible. 

A further advantage of the TUSTB is that by slackening and retightening the Allen screws, it is possible to slightly raise the LM digital adapter and thus very easily carry out an optical adjustment if the focus of the image viewed through the eyepiece does not match that of the camera image (parfocality).

The advantages of the TUSTB in summary: 

• Firm mechanical connection of the LM digital adapter to the phototube. There is no slipping and twisting, and no more blurred images caused by vibrations due to an unstable connection. 
• Adjustment of parfocality is easily possible with the help of the Allen screws.

27.02.2014