ฐานยึดฟอกัสเซอร์ GSO 303mm base plate สำหรับกล้องสะท้อน 12" (สำหรับ Crayford Focuser 2") FF434

• ฐานยึดฟอกัสเซอร์เข้ากับกระบอกกล้องดูดาวแบบสะท้อน ความโค้งสำหรับขนาดกระบอก 230มม เหมาะสำหรับกระบอกกล้องขนาด 12"
• สามารถใช้ในการณีย้ายฟอกัสเซอร์จากกระบอกกล้องขนาดอื่นมาใช้กับกระบอก 12"
• ใช้ได้กับ Crayford focuser ทั้งแบบ single speed และ dual-speed
• รองรับฟอกัสเซอร์ขนาด 2" เท่านั้น (ดูรายละเอียดด้านล่างเพื่อเลือกรุ่นที่เหมาะกับ Focuser ของท่าน)
• ผลิตภัณฑ์อลูมิเนียมคุณภาพสูงจากไต้หวัน งานกลึงละเอียดแม่นยำ มีการเพิ่มความต้านทานการผุกร่อน (anodization) สีดำเคลือบด้านสวยงาม

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 2" reflector Crayford models. Not for use with GSO's 1.25" Crayford focusers. Aluminum with black anodization.

Base Plate for 6" Telescopes - GSO FF001 (176mm Base Curve Diameter):

• 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")
• Inside diameter of central hole: 3.07" (77.9mm)

Base Plate for 8"/10" Telescopes - GSO FF435 (230mm Base Curve Diameter):
* 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")
• Inside diameter of central hole: 3.07" (77.9mm)

Base Plate for 12" and Larger Telescopes - GSO FF434 (303mm Base Curve Diameter)
* 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")
• Inside diameter of central hole: 3.07" (77.9mm)

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.

Please note: Most GSO Crayford focusers have or will soon develop two bearing marks/lines on the upper side of the drawtube. This is caused by wear on the barrel anodizing where is makes contact with the roller bearings. In some focusers, you have to look hard to find these marks. In others, it is very prominent, even for brand new items received from GSO. This does not indicate a defective or used product and is essentially just cosmetic.