GSO 1.25" EAF Compatible Crayford Focuser for Reflectors - Dual Speed
Sku:
PAF-GS-N1-CRF-DW123
Mfg #:
GS-N1-M-CRF-D
Item Can Ship:
Worldwide
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SKU:
PAF-GS-N1-CRF-DW123
Mfg #:
GS-N1-M-CRF-D
Item Can Ship:
Worldwide
Key Features
- Dual‑Speed Crayford Design: Fast coarse focus and smooth fine focus for precise control.
- EAF‑Ready Flat Mount: Direct ZWO EAF compatibility without third‑party brackets.
- Secure T/T2 Attachment: Removable 1.25-inch holder with brass compression ring and male T/T2 thread for secure camera/accessory mounting.
- Adjustable Tension & Locking: Set focus feel and lock position for stable performance with heavy accessories.
Description
Description
GSO Dual-Speed Crayford Focuser: Smooth Precision for Reflector Telescopes!
Bring smooth, precise focusing to your reflector with this Guan Sheng Optical (GSO) dual-speed 1.25-inch Crayford focuser, a high-quality upgrade designed to elevate both visual observing and astrophotography. The dual-speed design allows for fast coarse adjustments and ultra-fine control when critical focus matters most, delivering a fluid, confidence-inspiring feel with no backlash or image shift.
Precision CNC-machined from aluminum and finished in a durable black anodizing, this focuser offers excellent rigidity and long-term reliability. Internally, its carefully engineered drawtube provides smooth travel and minimizes stray reflections for improved contrast at the eyepiece or camera. Designed with modern imaging in mind, the flat-profile housing allows for easy integration with motorized focusing systems, making it a flexible choice for growing setups! Whether you’re fine-tuning planetary detail or locking in perfect focus on deep-sky targets, this focuser delivers the smooth performance and stability observers and imagers demand.
Standout Features
- Removable eyepiece holder with brass compression ring.
- T/T2 (M42x0.75) threading for direct and secure accessory attachment.
- Millimeter markings on the tube for percise focusing and refocusing.
- Focuser body can be rotated by loosening two allen screws that connect the focuser to the base plate.
- EAF ready out of the box.
Making the Correct Focuser Base Plate Choice
There is no standarization in the industry, and we don’t have the mounting hole specificationa for the many scopes on the market. With that in mind, you will need to carefully compare the base plate specifications we have provided below while making a choice yourself. This GSO focuser can be ordered with one of the two base plates offered in the drop-down list above. At this time GSO offers a 125 mm and 176 mm base plate. The mm specification refers to the diameter of the base curve, which should closely match your telescope tube’s outside diameter (not the aperture). Other base plate sizes are not available at this time.
125 mm # FF294: May be suitable for 4-5-inch reflector telescopes
- Base plate curve diameter: 4.93 in (125.1 mm)
- Base plate dimensions: 2.8 x 2.8 in (71x 71 mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 2.25 in (57 mm)
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 2.16 in (55 mm)
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 2.20 in (56 mm)
- Diameter of cutout hole for focuser body: 2.41 in (61.1mm)
176 mm # FF368: May be suitable for 6-7-inch reflector telescopes
- Base plate curve diameter: 6.93 in (176 mm)
- All other specs same as # FF294 above
Besides the base plate details, you must also consider the following:
Ensure the cutout on your telescope tube is larger than the outside diameter of the focuser drawtube, but not so large that it interferes with the mounting screw holes. This is a common issue on telescopes under 8-inch in aperture or models originally equipped with smaller 1.25-inch focusers.
Additionally, compare the minimum and maximum focuser heights listed below with those of your current focuser. This will help determine whether you can reach focus with your eyepieces and accessories or if extension tubes may be required. Please note that we cannot determine this for individual telescope or eyepiece combinations.
EAF Ready Design
Unlike earlier GSO reflector focusers with rounded housings, this model features a redesigned flat aluminum housing specifically built for ZWO Electronic Automatic Focuser (EAF) compatibility. Integrated mounting points allow the EAF to attach directly using the standard ZWO bracket—no third-party adapters required. This rigid, precision-fit design provides smooth, accurate motorized focus control, making it ideal for both visual observing and critical astrophotography. A 4mm coupler is included for the current EAFN and EAF-Pro models. A 5mm coupler for older EAF-STD and EAF-5V models is available separately. (ZWO EAF sold separately.)
Flexible Eyepiece and Accessory Connection
The 1.25-inch drawtube includes a removable eyepiece holder with a brass compression ring to protect your eyepieces and accessories, plus a male T/T2 thread for direct camera or accessory attachment. Two large thumbscrews let you lock the focuser for heavy setups and adjust tension to achieve your preferred smoothness—light and fluid for small eyepieces, or firmer for heavier cameras—without sacrificing control or precision.
Dual-Speed Precision
Dual focus controls let you make fast coarse adjustments with the main knob and ultra‑fine tweaks with the secondary gear, so you can zero in on perfect focus quickly and accurately! This dual‑speed design provides smooth, responsive control whether you’re dialing in critical focus for astrophotography or fine‑tuning views at high power, making it easier to achieve sharp, stable images every time.
Specifications with Curved Base Plate:
- Minimum focuser height: 3.01 in (77 mm) Note: In this position the inner drawtube extends below the curved base plate by about X mm which may intrude into your scope's light path.
- Maximum focuser height = 4.88 in (124 mm)
- Tube travel = 1.77 in (45 mm)
- Focuser weight = 14 oz (397 g)
- Focus knob diameter = 1.24 in (31.6 mm)
- Microfocus knob diameter = 1.24 in (31.6 mm)
- Outer drawtube diameter (on telescope side - your telescope tube cutout must exceed this) = 1.83 in (46.6 mm)
- Acessory threading: T/T2 (M42x0.75)
- Material: CNC-machined aluminum
Additional Important Notes
• 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 just cosmetic.
• No mounting screws are included with the base plate. You will need to provide your own.
• Not compatible with SCT, refractors, or 2-inch GSO focuser bodies or base plates.
• No instruction manual is included.
Useful Resources
- Product Article: Optimizing the Performance of your GSO Crayford Focuser
- Product Article: Selecting a Crayford Focuser for a Reflector (Coming Soon)
Other Information
- Country of Manufacture: Taiwan
GSO Dual-Speed Crayford Focuser: Smooth Precision for Reflector Telescopes!
Bring smooth, precise focusing to your reflector with this Guan Sheng Optical (GSO) dual-speed 1.25-inch Crayford focuser, a high-quality upgrade designed to elevate both visual observing and astrophotography. The dual-speed design allows for fast coarse adjustments and ultra-fine control when critical focus matters most, delivering a fluid, confidence-inspiring feel with no backlash or image shift.
Precision CNC-machined from aluminum and finished in a durable black anodizing, this focuser offers excellent rigidity and long-term reliability. Internally, its carefully engineered drawtube provides smooth travel and minimizes stray reflections for improved contrast at the eyepiece or camera. Designed with modern imaging in mind, the flat-profile housing allows for easy integration with motorized focusing systems, making it a flexible choice for growing setups! Whether you’re fine-tuning planetary detail or locking in perfect focus on deep-sky targets, this focuser delivers the smooth performance and stability observers and imagers demand.
Standout Features
- Removable eyepiece holder with brass compression ring.
- T/T2 (M42x0.75) threading for direct and secure accessory attachment.
- Millimeter markings on the tube for percise focusing and refocusing.
- Focuser body can be rotated by loosening two allen screws that connect the focuser to the base plate.
- EAF ready out of the box.
Making the Correct Focuser Base Plate Choice
There is no standarization in the industry, and we don’t have the mounting hole specificationa for the many scopes on the market. With that in mind, you will need to carefully compare the base plate specifications we have provided below while making a choice yourself. This GSO focuser can be ordered with one of the two base plates offered in the drop-down list above. At this time GSO offers a 125 mm and 176 mm base plate. The mm specification refers to the diameter of the base curve, which should closely match your telescope tube’s outside diameter (not the aperture). Other base plate sizes are not available at this time.
125 mm # FF294: May be suitable for 4-5-inch reflector telescopes
- Base plate curve diameter: 4.93 in (125.1 mm)
- Base plate dimensions: 2.8 x 2.8 in (71x 71 mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 2.25 in (57 mm)
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 2.16 in (55 mm)
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 2.20 in (56 mm)
- Diameter of cutout hole for focuser body: 2.41 in (61.1mm)
176 mm # FF368: May be suitable for 6-7-inch reflector telescopes
- Base plate curve diameter: 6.93 in (176 mm)
- All other specs same as # FF294 above
Besides the base plate details, you must also consider the following:
Ensure the cutout on your telescope tube is larger than the outside diameter of the focuser drawtube, but not so large that it interferes with the mounting screw holes. This is a common issue on telescopes under 8-inch in aperture or models originally equipped with smaller 1.25-inch focusers.
Additionally, compare the minimum and maximum focuser heights listed below with those of your current focuser. This will help determine whether you can reach focus with your eyepieces and accessories or if extension tubes may be required. Please note that we cannot determine this for individual telescope or eyepiece combinations.
EAF Ready Design
Unlike earlier GSO reflector focusers with rounded housings, this model features a redesigned flat aluminum housing specifically built for ZWO Electronic Automatic Focuser (EAF) compatibility. Integrated mounting points allow the EAF to attach directly using the standard ZWO bracket—no third-party adapters required. This rigid, precision-fit design provides smooth, accurate motorized focus control, making it ideal for both visual observing and critical astrophotography. A 4mm coupler is included for the current EAFN and EAF-Pro models. A 5mm coupler for older EAF-STD and EAF-5V models is available separately. (ZWO EAF sold separately.)
Flexible Eyepiece and Accessory Connection
The 1.25-inch drawtube includes a removable eyepiece holder with a brass compression ring to protect your eyepieces and accessories, plus a male T/T2 thread for direct camera or accessory attachment. Two large thumbscrews let you lock the focuser for heavy setups and adjust tension to achieve your preferred smoothness—light and fluid for small eyepieces, or firmer for heavier cameras—without sacrificing control or precision.
Dual-Speed Precision
Dual focus controls let you make fast coarse adjustments with the main knob and ultra‑fine tweaks with the secondary gear, so you can zero in on perfect focus quickly and accurately! This dual‑speed design provides smooth, responsive control whether you’re dialing in critical focus for astrophotography or fine‑tuning views at high power, making it easier to achieve sharp, stable images every time.
Specifications with Curved Base Plate:
- Minimum focuser height: 3.01 in (77 mm) Note: In this position the inner drawtube extends below the curved base plate by about X mm which may intrude into your scope's light path.
- Maximum focuser height = 4.88 in (124 mm)
- Tube travel = 1.77 in (45 mm)
- Focuser weight = 14 oz (397 g)
- Focus knob diameter = 1.24 in (31.6 mm)
- Microfocus knob diameter = 1.24 in (31.6 mm)
- Outer drawtube diameter (on telescope side - your telescope tube cutout must exceed this) = 1.83 in (46.6 mm)
- Acessory threading: T/T2 (M42x0.75)
- Material: CNC-machined aluminum
Additional Important Notes
• 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 just cosmetic.
• No mounting screws are included with the base plate. You will need to provide your own.
• Not compatible with SCT, refractors, or 2-inch GSO focuser bodies or base plates.
• No instruction manual is included.
Read Full Description
Specifications
Specifications
| Manufacturer | Guan Sheng Optical |
|---|
Reviews / Q&A
Reviews / Q&A
In the Box
In the Box
- Dual-speed focuser
- 1x 1.25-inch dust plug
- 1x 1.25-inchBrass compression ring
- 2x thumbscrews
- Shipped in foam-fitted box
Key Features
- Dual‑Speed Crayford Design: Fast coarse focus and smooth fine focus for precise control.
- EAF‑Ready Flat Mount: Direct ZWO EAF compatibility without third‑party brackets.
- Secure T/T2 Attachment: Removable 1.25-inch holder with brass compression ring and male T/T2 thread for secure camera/accessory mounting.
- Adjustable Tension & Locking: Set focus feel and lock position for stable performance with heavy accessories.
Description
Specifications
Reviews / Q&A
In the Box
Description
GSO Dual-Speed Crayford Focuser: Smooth Precision for Reflector Telescopes!
Bring smooth, precise focusing to your reflector with this Guan Sheng Optical (GSO) dual-speed 1.25-inch Crayford focuser, a high-quality upgrade designed to elevate both visual observing and astrophotography. The dual-speed design allows for fast coarse adjustments and ultra-fine control when critical focus matters most, delivering a fluid, confidence-inspiring feel with no backlash or image shift.
Precision CNC-machined from aluminum and finished in a durable black anodizing, this focuser offers excellent rigidity and long-term reliability. Internally, its carefully engineered drawtube provides smooth travel and minimizes stray reflections for improved contrast at the eyepiece or camera. Designed with modern imaging in mind, the flat-profile housing allows for easy integration with motorized focusing systems, making it a flexible choice for growing setups! Whether you’re fine-tuning planetary detail or locking in perfect focus on deep-sky targets, this focuser delivers the smooth performance and stability observers and imagers demand.
Standout Features
- Removable eyepiece holder with brass compression ring.
- T/T2 (M42x0.75) threading for direct and secure accessory attachment.
- Millimeter markings on the tube for percise focusing and refocusing.
- Focuser body can be rotated by loosening two allen screws that connect the focuser to the base plate.
- EAF ready out of the box.
Making the Correct Focuser Base Plate Choice
There is no standarization in the industry, and we don’t have the mounting hole specificationa for the many scopes on the market. With that in mind, you will need to carefully compare the base plate specifications we have provided below while making a choice yourself. This GSO focuser can be ordered with one of the two base plates offered in the drop-down list above. At this time GSO offers a 125 mm and 176 mm base plate. The mm specification refers to the diameter of the base curve, which should closely match your telescope tube’s outside diameter (not the aperture). Other base plate sizes are not available at this time.
125 mm # FF294: May be suitable for 4-5-inch reflector telescopes
- Base plate curve diameter: 4.93 in (125.1 mm)
- Base plate dimensions: 2.8 x 2.8 in (71x 71 mm)
- Hole Spacing (center-to-center along telescope tube/optical axis): 2.25 in (57 mm)
- Hole Spacing (center-to-center perpendicular to telescope tube; straight line measurement): 2.16 in (55 mm)
- Hole Spacing (center-to-center perpendicular to telescope tube; measured along curve of base plate): 2.20 in (56 mm)
- Diameter of cutout hole for focuser body: 2.41 in (61.1mm)
176 mm # FF368: May be suitable for 6-7-inch reflector telescopes
- Base plate curve diameter: 6.93 in (176 mm)
- All other specs same as # FF294 above
Besides the base plate details, you must also consider the following:
Ensure the cutout on your telescope tube is larger than the outside diameter of the focuser drawtube, but not so large that it interferes with the mounting screw holes. This is a common issue on telescopes under 8-inch in aperture or models originally equipped with smaller 1.25-inch focusers.
Additionally, compare the minimum and maximum focuser heights listed below with those of your current focuser. This will help determine whether you can reach focus with your eyepieces and accessories or if extension tubes may be required. Please note that we cannot determine this for individual telescope or eyepiece combinations.
EAF Ready Design
Unlike earlier GSO reflector focusers with rounded housings, this model features a redesigned flat aluminum housing specifically built for ZWO Electronic Automatic Focuser (EAF) compatibility. Integrated mounting points allow the EAF to attach directly using the standard ZWO bracket—no third-party adapters required. This rigid, precision-fit design provides smooth, accurate motorized focus control, making it ideal for both visual observing and critical astrophotography. A 4mm coupler is included for the current EAFN and EAF-Pro models. A 5mm coupler for older EAF-STD and EAF-5V models is available separately. (ZWO EAF sold separately.)
Flexible Eyepiece and Accessory Connection
The 1.25-inch drawtube includes a removable eyepiece holder with a brass compression ring to protect your eyepieces and accessories, plus a male T/T2 thread for direct camera or accessory attachment. Two large thumbscrews let you lock the focuser for heavy setups and adjust tension to achieve your preferred smoothness—light and fluid for small eyepieces, or firmer for heavier cameras—without sacrificing control or precision.
Dual-Speed Precision
Dual focus controls let you make fast coarse adjustments with the main knob and ultra‑fine tweaks with the secondary gear, so you can zero in on perfect focus quickly and accurately! This dual‑speed design provides smooth, responsive control whether you’re dialing in critical focus for astrophotography or fine‑tuning views at high power, making it easier to achieve sharp, stable images every time.
Specifications with Curved Base Plate:
- Minimum focuser height: 3.01 in (77 mm) Note: In this position the inner drawtube extends below the curved base plate by about X mm which may intrude into your scope's light path.
- Maximum focuser height = 4.88 in (124 mm)
- Tube travel = 1.77 in (45 mm)
- Focuser weight = 14 oz (397 g)
- Focus knob diameter = 1.24 in (31.6 mm)
- Microfocus knob diameter = 1.24 in (31.6 mm)
- Outer drawtube diameter (on telescope side - your telescope tube cutout must exceed this) = 1.83 in (46.6 mm)
- Acessory threading: T/T2 (M42x0.75)
- Material: CNC-machined aluminum
Additional Important Notes
• 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 just cosmetic.
• No mounting screws are included with the base plate. You will need to provide your own.
• Not compatible with SCT, refractors, or 2-inch GSO focuser bodies or base plates.
• No instruction manual is included.
Useful Resources
- Product Article: Optimizing the Performance of your GSO Crayford Focuser
- Product Article: Selecting a Crayford Focuser for a Reflector (Coming Soon)
Other Information
- Country of Manufacture: Taiwan
Specifications
| Manufacturer | Guan Sheng Optical |
|---|
Reviews / Q&A
In the Box
- Dual-speed focuser
- 1x 1.25-inch dust plug
- 1x 1.25-inchBrass compression ring
- 2x thumbscrews
- Shipped in foam-fitted box