SVBONY SV181 Rack and Pinion Focuser, 1.25 inch, Newtonian Reflector Focuser for Newtonian Reflector Telescope

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

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.

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.

Nice precice focusing ability thanks to their rack and pinion design

This focuser rides up and down smoothly. Accommodates my barlow lens with ease and stays where you stop.