Vixen Eyepiece Projection Camera Adapter - Manual (Page 3)

Distance (L) to the Focal Plane (Reference)
The table below shows distances between the focal plane on the camera with Pentax
K-mount and the rear lens surface of the eyepieces applicable to the Eyepiece Projection
Camera Adapter.
Size of Image on the Focal Plane
(The size of the planets changes as they come close to and go away from the earth.)
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