GSO 2" EAF Compatible Linear Bearing Crayford Focuser for Reflectors w/ Camera Rotator ...
Availability: Expected late 2025
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3. Description:
This GSO Dual-Speed Linear Focuser for Newtonian reflector telescopes features the most recent innovation in focuser design to hit the astronomy market in recent years. It is designed specifically to meet the heavier equipment and stability requirements of astrophotography equipment and heavy eyepieces. The linear stability and repeatable quality of focus reached with this focuser will have you returning night after night for more spectacular views, sharper images, and consistent enjoyment!
A. Eliminate Focuser Drawtube Slop
In conventional Crayford focusers, the drawtube is held in place by four roller bearings. Because of the small area of contact between the focuser tube and these bearings, changes in load or telescope orientation can cause some amount of slop in the focuser drawtube. The new linear bearing focuser is built with a cutting-edge rail system made of stainless steel which provides extended, consistent, and linear contact with the focusing mechanism and the inside of the focuser body, even when the focuser is fully extended. The result is zero flexure throughout the focus travel range, even in the worst case scenario when the focuser is parallel to the ground and carrying a heavy load such as a large CCD camera. This linear bearing rail mechanism also allows the use of heavier loads (GSO's rated load capacity for their linear bearing focusers is just under 8 lbs (3.6 kgs)).
B. Smooth Focusing Action
The ultra-smooth focuser adjustment knob is only topped by the 10:1 fine adjustment knob which yields superior fine-tuning that will stay in place without slippage for hours on end. You'll feel as if the focuser is gliding on air as you meticulously seek the perfect focus. For critical imaging applications, the focuser position can be locked in place via the large thumbscrew provided for this purpose on the top of the focuser. The focusing tension can be controlled by another large screw on the underside of the focuser. The drawtube features a laser-etched measurement scale for quick and repeatable focusing.
C. Very High Quality Construction and Features
The highly polished, anodized black aluminum is complemented by the meticulous CNC machining. Every part is carefully selected and designed to deliver a linear focusing system that will provide both beauty and quality for years to come. The 2" focuser barrel features a brass compression ring. Also included is a 2"-1.25" adapter with brass compression rings and threads to accept standard 2" filters. The focus travel is a generous 50mm (almost 2").
D. Out of the Box Compatibility with the ZWO EAF Electronic Automatic Focuser
All other versions of GSO's reflector focusers have a rounded or curved housing over the focusing mechanism, making it either impossible or hard to attach ZWO's EAF for automatic focusing control. After our prodding for almost 2 years, GSO redesigned the housing with a flat surface and with additional screw holes to allow users to easily and directly mount the ZWO EAF using the standard mounting bracket that the EAF comes with. The housing in this version is also made of aluminum for a secure, robust fit. Imagers can now use the EAF to precisely control the focuser's movement for visual or critical imaging applications. Note that the EAF is not included and is sold separately.
4. Specifications (With Curved Base Plate)
• Minimum focuser height (without 1.25" adapter) = 3.09" (78.6mm). Note that in this position, the inner drawtube extends below the curved base plate by about 32mm which may intrude into your scope's light path.
• Maximum focuser height (without 1.25" adapter) = 5.06" (128.6mm)
• 2"-1.25" adapter height = 0.39" (10mm)
• Tube travel = 1.97" (50mm)
• Drawtube outside diameter (cut-out in your telescope tube must exceed this) = 2.32" (59mm)
• Steel rail width = 0.56" (14.1mm)
• Focuser weight (with 1.25" adapter) = 1lb-14.5oz (866gm)
• Focus knob diameter = 1.57" (40mm)
• Microfocus knob diameter = 1.06" (27mm)
• Maximum outer body diameter = 3.23" (82mm)
• Measurement scale on focuser drawtube: Yes
• 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
5. Additional Comments:
• No mounting screws are included with the base plate. You will need to provide your own.
• The focuser is shipped in a foam-fitted padded box.
• No instruction manual is included.
| Product Banner Type | coming-soon |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Hide Found a better Shipped Price on Frontend? | No |
3. Description:
This GSO Dual-Speed Linear Focuser for Newtonian reflector telescopes features the most recent innovation in focuser design to hit the astronomy market in recent years. It is designed specifically to meet the heavier equipment and stability requirements of astrophotography equipment and heavy eyepieces. The linear stability and repeatable quality of focus reached with this focuser will have you returning night after night for more spectacular views, sharper images, and consistent enjoyment!
A. Eliminate Focuser Drawtube Slop
In conventional Crayford focusers, the drawtube is held in place by four roller bearings. Because of the small area of contact between the focuser tube and these bearings, changes in load or telescope orientation can cause some amount of slop in the focuser drawtube. The new linear bearing focuser is built with a cutting-edge rail system made of stainless steel which provides extended, consistent, and linear contact with the focusing mechanism and the inside of the focuser body, even when the focuser is fully extended. The result is zero flexure throughout the focus travel range, even in the worst case scenario when the focuser is parallel to the ground and carrying a heavy load such as a large CCD camera. This linear bearing rail mechanism also allows the use of heavier loads (GSO's rated load capacity for their linear bearing focusers is just under 8 lbs (3.6 kgs)).
B. Smooth Focusing Action
The ultra-smooth focuser adjustment knob is only topped by the 10:1 fine adjustment knob which yields superior fine-tuning that will stay in place without slippage for hours on end. You'll feel as if the focuser is gliding on air as you meticulously seek the perfect focus. For critical imaging applications, the focuser position can be locked in place via the large thumbscrew provided for this purpose on the top of the focuser. The focusing tension can be controlled by another large screw on the underside of the focuser. The drawtube features a laser-etched measurement scale for quick and repeatable focusing.
C. Very High Quality Construction and Features
The highly polished, anodized black aluminum is complemented by the meticulous CNC machining. Every part is carefully selected and designed to deliver a linear focusing system that will provide both beauty and quality for years to come. The 2" focuser barrel features a brass compression ring. Also included is a 2"-1.25" adapter with brass compression rings and threads to accept standard 2" filters. The focus travel is a generous 50mm (almost 2").
D. Out of the Box Compatibility with the ZWO EAF Electronic Automatic Focuser
All other versions of GSO's reflector focusers have a rounded or curved housing over the focusing mechanism, making it either impossible or hard to attach ZWO's EAF for automatic focusing control. After our prodding for almost 2 years, GSO redesigned the housing with a flat surface and with additional screw holes to allow users to easily and directly mount the ZWO EAF using the standard mounting bracket that the EAF comes with. The housing in this version is also made of aluminum for a secure, robust fit. Imagers can now use the EAF to precisely control the focuser's movement for visual or critical imaging applications. Note that the EAF is not included and is sold separately.
4. Specifications (With Curved Base Plate)
• Minimum focuser height (without 1.25" adapter) = 3.09" (78.6mm). Note that in this position, the inner drawtube extends below the curved base plate by about 32mm which may intrude into your scope's light path.
• Maximum focuser height (without 1.25" adapter) = 5.06" (128.6mm)
• 2"-1.25" adapter height = 0.39" (10mm)
• Tube travel = 1.97" (50mm)
• Drawtube outside diameter (cut-out in your telescope tube must exceed this) = 2.32" (59mm)
• Steel rail width = 0.56" (14.1mm)
• Focuser weight (with 1.25" adapter) = 1lb-14.5oz (866gm)
• Focus knob diameter = 1.57" (40mm)
• Microfocus knob diameter = 1.06" (27mm)
• Maximum outer body diameter = 3.23" (82mm)
• Measurement scale on focuser drawtube: Yes
• 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
5. Additional Comments:
• No mounting screws are included with the base plate. You will need to provide your own.
• The focuser is shipped in a foam-fitted padded box.
• No instruction manual is included.
| Product Banner Type | coming-soon |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Hide Found a better Shipped Price on Frontend? | No |