GSO 1.25" Crayford Focuser (with 176mm base plate) for Reflectors - Single Speed
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available.
- This item is out of stock.
- We have no ETA from the manufacturer at this time.
- Sign up for back-in-stock alerts to be notified when this item becomes available.
Lower 48 States:
Orders over $50 ship free within the Lower 48 using a carrier and service we select based on your items and delivery location. Faster shipping options may be available at checkout.
U.S. Outside the Lower 48 (AK, HI, PR):
Free shipping on orders over $50 applies to many—but not all—items. Add items to your cart and enter your ZIP code to see available shipping options and any costs.
International Orders:
Free shipping does not apply to international orders. You’ll see available shipping options and costs during checkout. Some items can’t be shipped internationally due to size or manufacturer restrictions. Duties, taxes, brokerage fees, and tariffs are not included and are the customer’s responsibility.
Important Note: We are unable to tell you whether this item is a suitable replacement for your telescope's OEM focuser or not. You will have to carefully review the detailed information and specifications provided below and compare this data to your telescope tube/current focuser to make your decision.
New part #: PAF-GS-NEW1-DW156; Previous part #: PAF-GS-CRF
New from GSO! This high quality, single-speed 1.25" Crayford focuser for reflector telescopes from Guan Sheng Optical (GSO) is a joy to use. You will wonder how you ever lived without it once you install it! It will greatly aid in achieving precise focus for visual observations and astrophotography and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.
CNC machined from aluminum and anodized black, this focuser comes with a base plate to attach to your reflector telescope. The inner drawtube glides on 4 precision bearings and a roller shaft and provides 47mm of focus travel. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast.
The focuser also has two large thumbscrews. The thumbscrew on the telescope side can be used to lock the focuser, allowing the use of heavy accessories or cameras without fear or slippage or losing focus. The other thumbscrew on the eyepiece end can be used to adjust the tension of the focuser to achieve a focusing "feel" that you like. At the easiest (lightest) setting, the focuser moves very smoothly. At tighter settings, you can still use heavier accessories without sacrificing much of the smooth focuser action.
Focuser Specifications (With 176mm Base Plate):
• Minimum focuser height = 3.01" (77mm)
• Maximum focuser height = 4.88" (124mm)
• Tube travel = 1.86" (47mm)
• Focuser weight = 14oz (397gm)
• Focus knob diameter = 1.24" (31.6mm)
• Microfocus knob diameter = N/A
• Outer drawtube diameter (on telescope side - your telescope tube cutout must exceed this) = 1.83" (46.6mm)
• Millimeter markings on focuser drawtube: No
• Rotatable: No (But body can be rotated by loosening two allen screws that connect the focuser to the base plate)
• Dust plug: One 1.25" dust plug included
• Brass compression rings: No
176mm Base Plate Specifications:
- Base plate curve diameter: 6.93" (176mm)
- Base plate dimensions: 2.8" x 2.8" (71mm x 71mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 57mm (2.25")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 55mm (2.16")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 56mm (2.20")
- Diameter of cutout hole for focuser body: 2.4" (60.9mm)
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.
Additional Info
- At this time, this focuser is only offered in a reflector version with a 176mm base plate.
- There are no plans for a dual speed version.
- 1.25" Refractor/SCT focusers or other base plates are also not available.
- The various base plates we offer with the GSO 2" focusers (Flat/176mm/230mm/303mm) are not compatible with this smaller 1.25" focuser.
Other Information
- Country of Manufacture: Taiwan
New part #: PAF-GS-NEW1-DW156; Previous part #: PAF-GS-CRF
New from GSO! This high quality, single-speed 1.25" Crayford focuser for reflector telescopes from Guan Sheng Optical (GSO) is a joy to use. You will wonder how you ever lived without it once you install it! It will greatly aid in achieving precise focus for visual observations and astrophotography and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.
CNC machined from aluminum and anodized black, this focuser comes with a base plate to attach to your reflector telescope. The inner drawtube glides on 4 precision bearings and a roller shaft and provides 47mm of focus travel. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast.
The focuser also has two large thumbscrews. The thumbscrew on the telescope side can be used to lock the focuser, allowing the use of heavy accessories or cameras without fear or slippage or losing focus. The other thumbscrew on the eyepiece end can be used to adjust the tension of the focuser to achieve a focusing "feel" that you like. At the easiest (lightest) setting, the focuser moves very smoothly. At tighter settings, you can still use heavier accessories without sacrificing much of the smooth focuser action.
Focuser Specifications (With 176mm Base Plate):
• Minimum focuser height = 3.01" (77mm)
• Maximum focuser height = 4.88" (124mm)
• Tube travel = 1.86" (47mm)
• Focuser weight = 14oz (397gm)
• Focus knob diameter = 1.24" (31.6mm)
• Microfocus knob diameter = N/A
• Outer drawtube diameter (on telescope side - your telescope tube cutout must exceed this) = 1.83" (46.6mm)
• Millimeter markings on focuser drawtube: No
• Rotatable: No (But body can be rotated by loosening two allen screws that connect the focuser to the base plate)
• Dust plug: One 1.25" dust plug included
• Brass compression rings: No
176mm Base Plate Specifications:
- Base plate curve diameter: 6.93" (176mm)
- Base plate dimensions: 2.8" x 2.8" (71mm x 71mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 57mm (2.25")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 55mm (2.16")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 56mm (2.20")
- Diameter of cutout hole for focuser body: 2.4" (60.9mm)
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.
Important Note: We are unable to tell you whether this item is a suitable replacement for your telescope's OEM focuser or not. You will have to carefully review the detailed information and specifications provided below and compare this data to your telescope tube/current focuser to make your decision.
New part #: PAF-GS-NEW1-DW156; Previous part #: PAF-GS-CRF
New from GSO! This high quality, single-speed 1.25" Crayford focuser for reflector telescopes from Guan Sheng Optical (GSO) is a joy to use. You will wonder how you ever lived without it once you install it! It will greatly aid in achieving precise focus for visual observations and astrophotography and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.
CNC machined from aluminum and anodized black, this focuser comes with a base plate to attach to your reflector telescope. The inner drawtube glides on 4 precision bearings and a roller shaft and provides 47mm of focus travel. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast.
The focuser also has two large thumbscrews. The thumbscrew on the telescope side can be used to lock the focuser, allowing the use of heavy accessories or cameras without fear or slippage or losing focus. The other thumbscrew on the eyepiece end can be used to adjust the tension of the focuser to achieve a focusing "feel" that you like. At the easiest (lightest) setting, the focuser moves very smoothly. At tighter settings, you can still use heavier accessories without sacrificing much of the smooth focuser action.
Focuser Specifications (With 176mm Base Plate):
• Minimum focuser height = 3.01" (77mm)
• Maximum focuser height = 4.88" (124mm)
• Tube travel = 1.86" (47mm)
• Focuser weight = 14oz (397gm)
• Focus knob diameter = 1.24" (31.6mm)
• Microfocus knob diameter = N/A
• Outer drawtube diameter (on telescope side - your telescope tube cutout must exceed this) = 1.83" (46.6mm)
• Millimeter markings on focuser drawtube: No
• Rotatable: No (But body can be rotated by loosening two allen screws that connect the focuser to the base plate)
• Dust plug: One 1.25" dust plug included
• Brass compression rings: No
176mm Base Plate Specifications:
- Base plate curve diameter: 6.93" (176mm)
- Base plate dimensions: 2.8" x 2.8" (71mm x 71mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 57mm (2.25")
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 55mm (2.16")
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 56mm (2.20")
- Diameter of cutout hole for focuser body: 2.4" (60.9mm)
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.
Additional Info
- At this time, this focuser is only offered in a reflector version with a 176mm base plate.
- There are no plans for a dual speed version.
- 1.25" Refractor/SCT focusers or other base plates are also not available.
- The various base plates we offer with the GSO 2" focusers (Flat/176mm/230mm/303mm) are not compatible with this smaller 1.25" focuser.
Other Information
- Country of Manufacture: Taiwan
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
GSO 1.25" Crayford Focuser (with 176mm base plate) for Reflectors - Single Speed