SVBONYSV165 Mini Guide Scope 30mm F4 Finder for SV305 Pro Compatible with ZWO QHY Orion Auto Guiding Cameras

Really easy to focus, and works really well. For the price, it is a great buy. I have attached an image I took using it (as a guider)

Good quality used for guide scope and it did what it was supposed to do.

It is a nice lightweight scope for auto-guiding. My Orion StarShoot autoGuider Camera fits on it well. This scope accommodates enough focus thread length to focus perfectly on my sensor without elongating more than ~20mm. The red Focus lock ring also makes it easy to lock focus without losing focus and without any knobs or set screws to come undone. Once focused it shows stars very well without halos or anything like that so the guider camera can do its job well. It is much lighter and smaller than my Orion 50mm it will not be a burden to my Skywatcher mount. The ring mounts for this are great and the lock screws have plastic guides on the front to stop any scratches on the barrel when locking. The rings are a good fit and the base has 1/4-20 threads which is great! It seems to be a nice cheaper option to the ZWO guider scope.I am also pleased with how quickly it arrived, just a couple days.

This little guide scope works great. Just know you basically have to unscrew the front end and barely put it back on if you want it to be in focus. Great beginner guide scope to grow with. If you are like me and live in the southeast make sure you buy a dew heater for it. gonna be a little adventures and try using it as a main scope one night to see what happens. but as for using it for guiding hands down greatest bang for your buck

Excelente material 👍🏻

Works just as well as $200 guide scopes, and for only 50 bucks, it’s definitely worth it. I can get guiding under 1 arc-second. Focusing can be tricky, but once it’s dialed in it performs perfectly. (I did 3-D print a due shield for it but it’s not needed.)

It’s amazing the quality of the optics and overall build quality. I wasn’t expecting much having a limited budget to work with, but it easily exceeded my expectations. of course clouds and rain arrived with it so I haven’t had an opportunity to image with it yet, but after playing with it for a couple hours I have no doubt it’ll perform. thing is beyond rock soild and achieves plenty good enough focus for what it’ll be used for. I didn’t notice any meaningful aberration even on a 32mp sensor and detail was still better than most of multi-thousand dollar Canon L glass I’ve got… Been playing with astrophotograpry since film was the only option and this is the first guide scope I’ve owned, far better than looking down the scope all night with an off axis guider and reticle eyepiece and hand controller in the guide port… Technology has really spoiled us.

While compact and lightweight, the main issue I have with this guide scope is there isn't a way to adjust it to perfectly align with the telescope. As a result, whether you are using it visually or with a guide camera, what you see through this finder/guider may not match what you see through the telescope, thus rendering it relatively useless unless you are using a very wide FOV telescope.