![]() The optics in the tube are perfect – no delamination and no blemishes in the surface. The tube has a magnification factor of 1.25x. There is a swing-out filter holder in which a neutral density filter may be placed to assist in balancing the illumination (neutral density filters are not included). The desktop image is focused with the chrome knurled ring on the distal end of the tube. The magnification ratio between the microscope image and the desktop image is regulated by a sliding sleeve (with the +V and V- markings). A beam-splitter in the intervening disk superimposes an image of the desktop adjacent to the microscope onto the microscope image. The drawing tube is interposed between the viewing head and the stand. It is not possible to simply remove the Zeiss flange and replace it with the Wild flange. The modification appears to have been done at the Heerbrugg factory since the entire central prism holder has been machined with the Zeiss flange accommodation in mind. The receptacle for the viewing tube has not been altered – in other words it requires a Wild style viewing tube. The mounting flange for the tube fits the tube fittings on the Zeiss ‘Grayline’ instruments. It is a drawing tube assembly (after Treffenberg) initially made for the Wild M20 compound microscope, however this tube has an interesting modification. This Wild Drawing Tube has been tested and is not working properly – selling as parts. ![]()
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