Moravian Canon EOS Lens Adapter Mk.II
The Moravian Canon EOS Lens Adapter Mk.II allows to attach Canon EOS lens to your Moravian Mark II camera. It has an optical length of 10.5mm.
All telescope/lens adapters of the Mark II series of cameras can be slightly tilted. This feature is introduced to compensate for possible misalignments in perpendicularity of the telescope optical axis and sensor plane.
The Mark II camera telescope adapters are attached using three “pulling” screws. As the adapter tilt is adjustable, another three “pushing” screws are intended to fix the adapter after some pulling screw is released to adjust the tilt.
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Adjusting the telescope adapter tilt (left) and removing tiltable the adapter (right)
Adjustable telescope/lens adapters are attached slightly differently depending if the adapter is attached directly to the camera head (e.g. when camera is equipped with internal filter wheel) or to the External filter wheel case.
- Mark II adapters are not mounted directly on the camera head. Instead a tilting adapter base, holding the circular spring, is always used.
- If the External filter wheel is used, the adapted base is not necessary, as the Mark II External filter wheel front plate is already designed to hold the spring and it also contains threads to fix respective adapters.
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The necessity to use the adapter base on the camera head eliminates the need of inserting of spacers between camera head and adapter itself if the particular BFD has to be maintained. Adapter bases are manufactured in two variants, differing in thickness, to compensate BFD among camera with external filter wheel, internal filter wheel and camera without filter wheel at all.
Thin adapter base is 4.5 mm thick. It compensates the difference in BFD between camera with External filter (33.5 mm) and camera with Internal filter wheel (29 mm).
Thick adapter base measures 17 mm, which is the thickness of External filter wheel housing. If the thick adapter base is attached to camera without filter wheel (with 16.5 mm BFD), it provides mounting interface for adjustable adapters in the same 33.5 mm BFD like camera with External filter wheel.
All documentation state Gx Mark II camera BFD 33.5 mm, measured to adjustable adapter mounting interface. This dimension can be achieved regardless if internal or external filter wheel or no filter wheel is used. However, if the camera without filter wheel is combined with the thin adapter base, resulting BFD is only 21 mm.
This combination cannot be used if particular adapter requires some back focal distance (for instance OAG or Canon EOS and Nikon bayonets etc.).