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Replacement Base Plate for GSO Reflector Crayford Focusers
| Brand | GSO |
| Part Number | - |
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Product Info
Manufacturer Description
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
* 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: 3.67" x 3.67" (93mm x 93mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 73mm (2.87")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 72mm (2.83")
- 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.
Reviews
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Mar 13, 2018
Type 2: Base Plate for 12" and Larger Telescopes - GSO
Pros: Cons: Comments:This plate worked great for my scope, however I have a 10" Newtonian and the base for the 8-10" did not match my scope. Since the outside dimension of my scope is over 12 1/2", I bought this one to go with my new GSO focuser. Seems you have to base the size on the dimension of the tube, not the mirror size. There's no mention of that in the description of the bases when having to pick one.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Mar 11, 2016GSO curved base mates well with my JMI focuser and 12" tube.
Pros:Easy to Use,Strong Construction,Lightweight,Accurate
Cons: Comments:The GSO curved base fit my JMI Crayford focuser and my 12" telescope tube. A great combination.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jun 26, 2015Fits perfect - well constructed
Pros:Solid
Cons:None
Comments:I have an old Celestron G-8N scope. I wanted to buy a new focuser and did not want to modify my tube in any way. I bought this mounting plate to see how well it would work with my setup. Surprisingly it fit perfect. So after mounting this I bought the GSO 2" Linear Bearing Crayford Focuser for Reflectors. I am really happy with my purchases.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
May 30, 2014Great solution
Pros:Accurate,Lightweight,Strong Construction,Easy to Use
Cons: Comments:While looking for a crayford focuser for an 8" Newtonian, I happened upon these replacement GSO bases. I already had an extra focuser for a 10" newt so for $16 I was able to convert it over to the new size. Very cool. Didn't even know these were available until finding them at Agena. Saved me a bunch! Easy to swap and fit perfectly. Thanks Agena!
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Dec 11, 2012One focuser, multiple telescopes
Pros: Cons: Comments:Focusers are not inexpensive, but among one of the very first things to be replaced after purchasing a mass-produced telescope. Stock focusers tend to be ugly and disappointing to use. In the past, if an owner replaced the stock focuser with an after-market item, the focuser would stay with that telescope for the rest of its life.
Bottom Line: Would you recommend this item? Yes
The GSO focusers are quality focusers that delivers user satisfaction that rivals the very best of focusers. I recently bought a 6" Newtonian, and all that was required to transfer the focuser from my 8" Newtonian to the 6" was to buy a new base and attach it to the 6".
As an aside, I also recently bought a 5" Newt. The base for the 6" does not fit the 5" so well, but it fits well enough to be 100% usable and reliable.This review was provided courtesy of AgenaAstro.com
dbigers New Member
- Skill Level
- Unknown
- Time with Product
- Unknown
- User Notes:
- Review by Donnie of Western KY.
May 5, 2011Perfect fit
Pros:Strong Construction,Accurate
Cons:None
Comments:I received this when I bought a new GSO focuser from Agena. After selecting the focuser I was asked what size telescope the focuser would be installed to. Until recently, the only option if you owned a 6" scope was to use the 8" base and add shims to get it installed. The 6" base that Agena offers works perfectly for 6" scopes.
Bottom Line: Would you recommend this item? Yes
I installed a GSO Dual Speed Crayford onto a Meade SN6 and used this baseplate. Installation looks great and the base matched the profile of the scope perfectly. No gaps at all, just a seamless transition from scope to focuser. Great product that is sorely needed. There are a lot of 6" newts out there that could benefit from a 2" focuser. Installing one has just become much easier.This review was provided courtesy of AgenaAstro.com
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