xiJ - Technical Manual Version 0.06
16
figure 3-1, distance between flange focal distance and back focal distance
3.3.2.
T-mount (M42 x 0.75mm)
The camera can be coupled with additional lens adapters and extensions to further expand the range of compatible lenses:
•
Standard T-mount: Flange focal distance is 55mm (can be achieved with purchased T-mount extension rings: 20mm in
25mm extension ring + 10mm extension ring).
•
Canon EF mount: Flange focal distance is 44mm (20mm in 5mm extension ring + 19mm T2 to Canon EF mount
adapter)
•
Nikon F mount: Flange focal distance is 46.5mm (20mm in 5mm extension ring + 0.5mm 21mm T2
to Nikon mount adapter)
3.4.
Optical path
3.4.1.
Filter glasses
A filter glass is part of the optical path of the camera. The window is cold welded using indium wire, to keep contaminants out
of the camera and to keep the filler gases intact. The camera can operate without a lens mount. Do not use compressed air to
clean the camera as this could damage (e.g. scratch) the filter glass. Distance from the flange to sensor is designed so that the
optical distance is 16.62mm - 0.2mm (tolerance). Additionally, C-mount or T-mount lens accessories can be installed on the
camera providing various lens mounting options.
