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GSO 2" Linear Bearing Crayford Focuser for Reflectors - Dual Speed
| Brand | GSO |
| Part Number | - |
| Availability | available |
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Product Info
Manufacturer 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!
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 about 9 lbs (4.1 kgs)).
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.
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 2".
Specifications (With Curved Base Plate)
• Minimum focuser height (without 1.25" adapter) = 3.05" (77.5mm)
• Maximum focuser height (without 1.25" adapter) = 5.05" (128mm)
• 2"-1.25" adapter height = 0.39" (10mm)
• Tube travel = 2" (50.8mm)
• 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-11.5oz (779gm)
• 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
Additional Comments
• The focuser is shipped in a foam-fitted padded box.
• No instruction manual is included.
Reviews
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Jul 13, 2019
Linear bearing Crayford
Pros: Cons: Comments:I had the roller bearing version originally. Unlike this linear bearing version, it had limited load capacity. Was fine with lower loads but balked at Televieimage amplifier and binoviewer combination.
Bottom Line: Would you recommend this item? Yes
In contrast, this linear bearing focuser is designed for much heavier loads. No problem carrying heavy load including Televue paracorr coma corrector with its 2” barrel along with a Nagler V 32 mm eyepiece (the size of a softball) ! I recommend this linear bearing Crayford focuser for long, heavy eyepiece and accessory combinations!This review was provided courtesy of AgenaAstro.com
May 6, 2019Celestron C8-N
Pros: Cons: Comments:The stock focuser did not have a fine focus adjustment so I replaced it with one within my budget.
Bottom Line: Would you recommend this item? Yes
The GSO appears to be built well. I did need to drill the screw holes in the optical tube one size larger. This allowed the mismatch of the screw holes to work using the existing screws/nuts to work.
I'm happy with the GSO focuser.This review was provided courtesy of AgenaAstro.com
Jul 12, 2018GSO Linear Dual Speed Focuser
Pros: Cons: Comments:This Focuser is excellent.. And I have used or owned almost all of the Top of the Line Focusers..This Focuser holds all of my BIG 2" Eyepieces even with a 2" Barlow along with them. Very happy with the way this Focuser performs..Recommend !!!
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Apr 2, 2018too precise
Pros: Cons: Comments:buy a dual speed economic focus that gives me a better performance than my Celestron C8n brings, and this does not disappoint me, I just had to get that if a longer screw because it is a little wider, but I'm super happy with the performance, now I can have more precision in the approach when doing astrophotography. additionally super pleased with the delivery was too efficient, I have 2 purchases made in Agenastro and I have not disappointed, greetings from Costa Rica.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Mar 25, 2018Gaining Back Focus on a Dobsonian
Pros: Cons: Comments:Been engaged in astronomy for about four years. Have a 10" reflector and gradually got interested in astrophotography. As most of you know photography with a reflector is challenging. It is, however, an intriguing pursuit. This focuser is a necessary link and has improved my quest greatly.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jan 21, 2018Very nice focuser
Pros: Cons: Comments:An amazing product for the price. High quality, heavy, velvet operation and well machined. The only minor complaint is that when the clutch screw is tightened to prevent the barrel slipping (in the case where its carrying more weight) the fine adjust no longer operates and just slips. But I still recommend it.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Dec 10, 2017GSO linear bearing focuser for reflectors
Pros: Cons: Comments:I have not had a chance to test in the field.
Bottom Line: Would you recommend this item? Yes
Very well built. Easy to install. Adapters were plug and play.This review was provided courtesy of AgenaAstro.com
May 26, 2017great little unit
Pros: Cons: Comments:I bought this to replace stock rack and pinion focuser. I read some reviews and was a little worried I would need to take it apart to add grease but they were unfounded. It is quite smooth and I am very satisfied with my choice. I have an XT8 dob and I got the 1A mounting plate. I didn't like that the screws didn't go in perpendicular to the tube. I bought the 1B plate and installed that. Much better. I bought my scope in 2000 so I had to open up the focuser hole to fit. I had to drill some holes to fit. I found out about a "KNIBLER" tool on an astronomy sight and it worked good. It's like a mini punch and die . It's hand held , similar to a pair of plyers. Very little distortion. I found it on AMAZON for about 10. dollars.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Apr 2, 2017Very nice piece
Pros: Cons: Comments:I opened the box and just said "wow"!
Bottom Line: Would you recommend this item? Yes
It makes the all metal Meade focuser from the early 90's look like a toy, I would buy again!This review was provided courtesy of AgenaAstro.com
Jan 3, 2017GSO 2" Linear Bearing Crayford Focuser for Reflectors
Pros: Cons: Comments:Upgraded my Celestron C8-N tube with this. Just replaced the stock 4mm screws on the original R&P Focuser with ones that are about a 1/4 inch longer and it was a direct fit using the Type 1A base plate. This thing is a huge improvement over the stock R&P Focuser.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Oct 2, 2016Excellent product
Pros:Strong Construction,Accurate
Cons: Comments:Very well made, very smooth. Only downside is limited range of focus. I have 2 Barlows and would have to change focus extension tube to use both where I didn't even need an extension tube before for either.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jun 26, 2015Very Happy with my purchase!
Pros:Easy to Use,Strong Construction
Cons:None
Comments:I have an old Celestron G-8N Newtonian scope (Model 31058). It had stock old rack and pin style focuser. It was really rocky and very hard to culminate. After contacting Celestron and they recommended I look at the focusers that Agenaastro sells. I still wasn't sure this would fit my scope properly so I bought the base first and it fit perfect. Next I purchased this focuser. I am extremely happy with this purchase. I love how smooth the focuser moves and the fine tune nob really makes things a ton easier. Also I don't have to worry about the weight of my camera. I thing I'm most happy about is that I didn't have to modify my tube to get this to mount.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Mar 28, 2015GSO 2" Linear Bearing Crayford Focuser
Pros:Accurate
Cons: Comments:I bought this focuser for my new dobsonian currently being made.
Bottom Line: Would you recommend this item? Yes
The focuser is very well and precisely made as advertised, and no flexure throughout the focus travel range thanks to its linear bearing feature.
Though the focuser motion is not silky smooth it is acceptable considering the price.
The only dissatisfaction is that this one is not a low profile focuser, which needs caution for designing the dobsonian so that there shall be no shade by the draw tube when installed.This review was provided courtesy of AgenaAstro.com
Oct 18, 2014Recommend to a friend
Pros:Accurate,Strong Construction
Cons: Comments:I use this in my 6" reflector, and I have bought other products from Agena Astro and like the service and the products. I also purchased Agena ED eyepieces and enjoy them. Looking forward to purchasing more.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jun 17, 2014Great 2" focuser at a super price
Pros:Lightweight,Strong Construction,Compact
Cons: Comments:As with all purchases that I've made through Agena, I was more than pleased with this GSO 2" LB focuser. It will be used to replace an older Crayford style unit and will do so with ease. I've since machined parts for a remote control unit with parts from Hobby Engineering (miniature gearhead motor and bidirectional PWM kit) - great to be able to look at the monitor and focus an image remotely.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jan 19, 2012Best money ever spent!
Pros:Strong Construction,Accurate,Very smooth,Easy to Use
Cons:None
Comments:I can't believe the difference this makes. I just replaced the plastic focuser on my Meade 10" starfinder EQ which I have been using for years. Best money I have ever spent. I love it.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jan 2, 2012The 2 speed Crayford Focuser
Pros:Strong Construction,Compact,Lightweight,Easy to Use,Accurate
Cons: Comments:The Crayford focuser was the best addition to my 16" reflector in 20 years.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
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Manufacturer GSO Focuser Telescope Type Reflector
