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Terry Wood

Jupiter (clearer) Nov 5th 2023 w/Mewlon 180c

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PENDING - Rack/Pinion Focuser for 80mm Refractor (ST80)

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Orion ST80 1.25", single-speed, rack/pinion focuser for refractors

Excellent condition. Smooth operation over full range of travel. Virtually no cosmetic defects. Only two very small paint chips on a bottom edge (see photo with arrows).
- All-metal construction except for focuser knobs
- Orion-style finder shoe
- Focus lock thumbscrew
- 1.25" eyepiece holder (black portion)
-- Two metal thumbscrews (no compression ring)
-- Screws into the drawtube with what appears to be an ~42 or 43mm thread of unknown pitch
-- Male T-thread on the rear end. No inside female threads. Didn't work for what I bought it for.

- Measurements
-- 131.5mm from rear of flange to rear of eyepiece holder (fully racked in)
-- Focuser travel = 61mm
-- Male OTA attachment flange O.D. = 86.6mm
-- Flange depth = 15mm
-- OTA attachment is by three M5 screws (provided)
-- Drawtube I.D. = ~40.4mm
$40 via Venmo or Zelle (I do not accept PayPal) - includes shipping in CONUS