ST10XME to Pentax 67 Medium Format Lens Adapter
Images at the chip size of the ST10XME
(KAF3200ME) at 14.9mm x 10mm yield quite small image diagonals when used
with typical telescopes of >1000mm focal length. A capability for more
wide field exposures is much desirable. Here photographic lenses come to
mind. Unfortunately the optical path length of the ST10XME camera plus
filter wheel CFW8 is much longer than the register distance of SLR 35mm
lenses. Medium format lenses however provide the spacing and so for this
project a Pentax Takumar 67 200mm F4 lens was chosen. (Lens from Ebay)
The lens has a bayonet lock. To fit it to the camera's T-2 nose piece an
adapter was manufactured. Basis for the adapter is a 14mm Pentax 67 extension
ring, normally used for macro photography. With a few modifications a 2"
T-2 thread was attached to the ring. This adapter provides the connection
between the CCD camera and the 67 lens.
Focussing and F-stop selection is fully manual. A motorized focuser
is not planned.
Here a few pictures of the project:
The aluminum ring with T-2 adapter.
The individual components, CCD camera, adapter and lens.
The components assembled.
The setup on the Vixen SP mount.
To prevent flexure I added an aluminum bar with ring to support the
frontof the lens.
The whole setup is bolted to the tube rings of the 13" scope which will
also serve for guiding.
The first light image with
Copyright images and processing Gert Gottschalk.
Copyright Bilder und Verarbeitung Gert Gottschalk.
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