Left:Dummy plug is inserted. Right: Y filter is inserted.
Note that the filter covers on the part of window.
The light pass to the guide CCD is not obstructed by this filter.
Left: The D-ring of ST-7E has been modified so that Y or R filter can be inserted.
Right:The slit is 0.5 mm x 25 mm. The thickness of plastic filter (by FUJI) is 0.2mm.
R and Y filter units
No filter is required for L, because the focus shift by the plastic filter is negligible.
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