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APPENDIX H:
DE-ROTATER AND
MICROFOCUSER ASSEMBLY
When using a de-rotater, it is important to attach the microfocuser so that it is backed
off slightly from the de-rotater. If the microfocuser is flush against the de-rotater, the
assembly will not work properly. This is true also with other accessories that may
attach up flush against the de-rotater housing. The diagonal mirror (if used without the
microfocuser) may be attached tightly as it does not rub up against the de-rotater
housing.
To attach the microfocuser to the de-rotater:
Refer to Fig. 6, page 13, for an exploded view of the microfocuser assembly. Perform
this assembly on a flat surface (such as a desk or a table) before you attach the de-
rotater and microfocuser to the telescope.
1. With the de-rotater on a flat surface, thread on the adapter ring (B, Fig. 6) until it
just touches the housing; then back off the adapter ring (i.e., turn it counter-clock-
wise) one full revolution as shown in Fig. 58.
2. Place the microfocuser over the ring with the "hump" of the microfocuser in the
12:00 position as shown in Fig. 59.
3. Using the provided hex key, tighten to a firm feel one of the three microfocuser hex
screws (K, Fig. 6) up against the adapter ring as shown in Fig. 60. Take care not
to tighten or loosen the adapter ring as you position and tighten the microfocuser
in place.
4. Tighten to a firm feel the other two microfocuser hex screws.
5. Attach the de-rotater to the rear cell of the telescope.
Fig. 58: Back off the adapter ring one
full revolution.
Fig. 59: Place the microfocuser over
the adapter ring. Notice the orienta-
tion of the microfocuser.
Fig. 60: Tighten the three microfo-
cuser hex screws to a firm feel.
12:00 position
