Replacement Base Plate for GSO Reflector Crayford Focusers

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Replacement Base Plate for GSO Reflector Crayford Focusers

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Product Details

All GSO Crayford focusers for reflector telescopes include a mounting base. However, you can also purchase additional bases.  Bases fit on all single and dual speed GSO reflector Crayford models. Aluminum with black anodization. Available in five models.

Type 0: Base Plate for 6" Telescopes - GSO

- Base plate curve diameter: 6.93" (176mm)
- Base plate dimensions: 3.54" x 3.54" (90mm x 90mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 70mm (2.76")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 73mm (2.87")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 74mm (2.91")

Type 1A: Base Plate for 8"/10" Telescopes - GSO
* Direct bolt-on replacement for stock R&P focusers on 8"/10" GSO dobsonians sold under the following brand names: Antares, DSH, Hardin Optical, Zhumell, DBA, and many others.
* Direct bolt-on for Celestron Star Hopper and Meade Light Bridge telescopes.
* May work for some Orion XT dobsonian telescopes. Please measure hole spacing on your scope before purchase.

- Base plate curve diameter: 9.06" (230mm)
- Base plate dimensions: 3.54" x 3.54" (90mm x 90mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 70mm (2.76")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 73mm (2.87")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 74mm (2.91")

Type 1B: Base Plate for 8"/10" Telescopes - Non GSO (DISCONTINUED)
* We got a bunch of these from a supplier and aren't sure what telescopes these would work with since the hole spacing is a bit different than the GSO plate above. Perhaps it is just the plate your non-GSO scope needs.

- Base plate curve diameter: 9.06" (230mm)
- Base plate dimensions: 3.62" x 3.62" (92mm x 92mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 75mm (2.95")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 75mm (2.95")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 76mm (2.99")

Type 2: Base Plate for 12" and Larger Telescopes - GSO
* Direct bolt-on replacement for stock R&P focusers on 12" GSO dobsonians sold under the following brand names: Antares, DSH, Hardin Optical, Zhumell, DBA, and many others.
* Direct bolt-on for Celestron Star Hopper and Meade Light Bridge telescopes.
* May work for some Orion XT dobsonian telescopes. Please measure hole spacing on your scope before purchase.

- Base plate curve diameter: 11.93" (303mm)
- Base plate dimensions: 3.54" x 3.54" (90mm x 90mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 70mm (2.76")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 73mm (2.87")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 74mm (2.91")

Type 3: Flat Base Plate
* Replaces OEM 8"/10"/12" curve bases if you need a flat mount.

- Base plate dimensions: 3.62" x 3.62" (92mm x 92mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 76mm (2.99")
- Hole Spacing (center-to-center perpendicular to telescope tube): 76mm (2.99")
- Plate thickness: 0.31" (8mm)

Additional Notes:
* You may need longer screws for some plates above as compared to the ones you already have on your telescope (available for a few cents each from any hardware store).
* Can be adapted to most other Dobsonian and Newtonian telescopes by drilling additional holes on the OTA if necessary.

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