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Do you have focusing problems for your telescope?
Do you want to give your reflector an accurate focuser?
SVBONY SV181 Rack & Pinion Focuser for Newtonian reflector is coming!
SV181 Rack and Pinion Focuser is suitable for 114mm and 150mm Newtonian reflector telescope.
Package Includes:
1x SV181 1.25" R&P Reflector Type Focuser
1x M4 Screw
1x M6 Screw
Internal brass design
A brass compression ring to prevent the marring of your telescope accessories;Internal brass ring that the set screw hits to hold your 1.25" eyepiece inside for eliminates marks on your eyepiece barrel
Large and convenient knob
You can also use it with gloves
Matting thread
Glare-threaded and flat-black interior ensures excellent contrast
Locking thumb screws
With an aluminum locking thumb screws to secure adjusted focus make sure it won't come loose
High-quality manufacturing materials
All metal construction and anodizing aluminum process; durable for long time use
Dust cover
SVBONY SV181Telescope focuser is with dust cover; which can effectively prevent dust from entering the lens body .
Customer
2025-08-28 10:56:54
Nice upgrade for an old focuser on my 1950’s Newtonian
Pat U
2025-08-26 10:10:03
Plus for all metal construction. Curve on plate is for a 5 inch tube. I have a 4 1/2 inch tube and needed to make a spacer to fill the gap between the tube and the focused. The focus adjuster was very loose and wobbly. Strap that holds the adjuster knob shaft is poorly designed and doesn’t do the job properly. I was able to tighten in up by bending the straps so it pushes the shaft closer to the gear. The strap is made of thin steel and this should have been done at the factory or a better tighter fitting part made. Once tightened it seemed to work acceptable but it might loosen again over time. Tension locking screw on adjuster is a nice feature that OEM adjusters don't have. Good product with some flaws which can be fixed with a little effort. The draw tube and gears are all metal which is nice.
NRR0710
2025-08-16 16:52:09
Well crafted perfect for telescope project , lightweight, great smooth operation!
D. Nasser
2025-08-12 20:00:41
Decent quality but the sizes can be problematic if doing a restoration. The biggest problem is the 3" draw tube. It project WAY into the light path on a 6" f8 Newtonian. It certainly was unusable for my application.
Randall Wilburn
2025-08-05 11:14:29
Much nicer focuser than the original .965. Smoother motion and longer stroke. However the radius of the base is to large. I made a shim of pvc to keep it from distorting my tube when I tighten the screws. The description said it would fit a 114mm telescope and it does, just takes a little bit of creativity. Would be nice to include a shim. Also when its all the way in it interferes with the secondary mirror. But that being said, still a good deal and a major improvement on my telescope. Now I can use 1.25 eyepieces and they focus on near and far objects. Definitely a 5 star item. I should give it 4 stars because of the radius issue, but its auch an improvement I'm gonna give svbony a pass. Thanks svbony.
jh
2025-07-17 18:54:31
Prime day purchase. About 5 hours of effort to modify for my DIY 80mm objective, 520 mm refractor telescope. Focuser has precise helical brass gears, anti-friction pads for aluminum draw tube stability, tube position tension/lock screw, all metal construction. Total play is minimum. Gear ratio should be good at least up to 200x. Very stable for 1.25 optical eyepieces or to focus into camera. Enjoying the great value. Would be great to have a standardized 2.5 inch tube as an option for refractor. FYI -2 inch tube extension is not big enough for both linear gear and draw tube.
R George
2025-07-13 12:54:10
Good cheep focuser for modifications. Iv'e added five photos. First there are photos with a ruler next to the focuser so you can see how much travel it has. With the focuser racked in all the way, it blocks light coming into the telescope. I don't need that much travel. I disassembled the focuser (third photo), cut 40 mm off the focuser tube and rack, and put it back together. I filled some of the rack threads with solder and drilled and countersunk a new hole for the screw. The screw threads are 2 mm x 0.4 mm. I got the tread tap off amazon. I also ground off the bottom of the focuser with an angle grinder and sand paper to make the focuser fit flat on my telescope box. I could have put some putty under the arch, but I needed the focuser to sit very low. Finally a photo of the old focuser and this new one on the telescope box. I will put the camera on the old focuser, and a cross hair recital eyepiece in the new one for guiding during photography. Also I want to mention that there are three little allen screws on one side around the silver thumbscrew. Two of them press a piece of plastic against the draw tube to tighten it up. The third keeps the plastic piece from falling out.
Michael Roberts
2025-07-02 12:11:16
I replaced the focuser on my Orion 6" dob telescope. Researching I learned that all reflector scopes 6" and smaller share the same cheap sloppy focuser and this is the only one I could find to replace the cheapy. I did have to enlarge the drawtube hole with a rotary tool and drill 4 small holes to mount the base. I am mechanicaly inclined so that was no problem for me. The SVBony focuser is a qaulity unit consisting of a metal base and a far superior drawtube that fits tightly in the base and rides on nylon or delrin guide strips which makes its travel very smooth. The strips also take out all of the drawtube wobble and sloppy fit of the stock plastic focuser. The rack and pinion gears are helical cut and have much less gear backlash than the stock focuser. You cannot beat this focuser for the price period! This focuser is built every bit as good as the replacements sold costing over twice as much as this focuser. This focuser was my introduction to SVbony products and since I have purchased some of there eyepieces as well and boy was I surprised! Very good products indeed. I have no concerns buying SVbony parts and will continue doing so when they have something that I want. Thank you SVbony for bringing your products to the market. You have earned a loyal customer.
Luis Antonio Delgado
2025-04-22 14:38:52
Este soporte lo ocupe en un telescopio que fabrique y gracias a la cremallera puedo hacer un mejor enfoque, les comparto una foto la Luna
matt
2025-03-31 18:29:29
Bought this because i wanted an upgraded focuser for my cheap bushnell 4.5" newt. If you are looking to do the same i would absolutely recommend it... but you will have to be a little handy, i didn't check the focuser tube diameter itself on my current scope and it was 41mm as was the whole in the telescope tube. The focuser tube on the SVBony focuser is 46.4mm i believe and of course did not fit. However if u have a large step drill bit or some sharp tin snips you will easily be able to enlarge the whole and it fits perfectly. Also as mentioned in previous comment the mounting of the actual focuser to the telescope will likely require some shims as its sized for 6" scope i believe. I also had to modify handle to attach motor focuser but was easily done. Overall great Quality all metal (except tiny plastic shim) and no wobble in the focuser tube. I collimated it after installation which was almost pointless with original focuser and works perfect.
M.A.
2025-02-09 11:17:14
Se siente de super buena calidad. Me gusto el material, más reciente. Tiene un anillo que ayuda a sujetar los oculares sin dejarles marca. También un tornillo fijado para el enfoque y compensar peso de ocular, cámara, teléfono o lo que se le coloque a la mirilla.Por desgracia no fue compatible con mi telescopio y lo tuve que devolver, pero se veÃa excelente
Customer
2025-02-02 12:00:33
For the price it's built pretty decent, however I did have to modify my Orion 4.5" starblast in order for it to fit properly.Reading other reviews on this product, I found out that it is possible to fit it on to my smaller scope. Though the radius of the base of the focuser mount is meant really for a 6" telescope, and the inner tube length and radius is larger than whats meant for the scope.I was able to shave the radius of the hole for the inner tube on the telescope with a rat tail file, drilled 4 new holes for the bolts, and placed a rubber shim in between the scope and the new focuser. colimation to finishI am a fan of the all metal, and there's virtually no wobble on this focuser so I can definitely recommend it. However the draw tube is way too long and can't get proper focus on my 4.5"
VÃctoriofd
2025-01-11 15:16:15
Producto de buena calidad relación precio y muy funcional
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