Tydeux Red Dot Finderscope - Star Pointer Viewfinder Astronomical Telescope Accessories with Slide-in Bracket

Very reasonably priced and seems to work well. The adjusting screws work smoothly. It does not come with a battery, and it requires removal of the scope from its base to remove the screw securing the battery compartment. This is a fairly trivial task, and it is supposedly to prevent children from getting access to the battery and swallowing it. The small extra hassle is well worth it if it prevents an injury.

Excelente

Awesome product

Works like a charm.

No particular way to mount

I've purchased several of these (this brand and others) and for the money, you can't beat them. The only significant difference (I notice) between this Brand and a different/more-expensive Brand is the Battery-Cover and I prefer this one. For both this Red-Dot (and my Telrad's) I made a Gizmo to enable my forgetting to turn it Off (the Gizmo will go-to-Sleep and pull only 1uA (yes, Micro-Amp, not Milli-Amp). This is accomplished by using an ATtiny85, Sleep-Mode and my code). These Red-Dot's use a single 2032-coin battery and they typically have 220-mAhr Capacity, thus could forget about turning it Off for many years! (do the math...) I've done them on Mini-BreadBoards and PerfBoards... photo Needed to make a Fake Battery (some cardboard disc's with Foil-wrapped on Wire ends)

Don’t let this fool you in thinking that it’s the same as the celestron red dot. It’s not!!! The brightness level at the dimmest is VERY bright. It does a poor job in preserving your night adapted vision. One of my colleagues have the celestron red dot finder and it works flawlessly and consistently. I clearly can’t rely this for my 80mm APO for visual use. It has a finite amount of play until I can’t adjust any further. In other words, I can’t get it close enough to my field of view and it bottomed out. Did I forget to mention? There’s no battery included so have fun with that!!! Last one is an issue and I worked around its lack of adjustability and said that each object is 4 degree to 7 o-clock on the red dot to get it right. That position is never consistent and I find myself having to bottom it out to get back to the calibrated spec. I don’t recommend this red dot. Kinda wish I never shattered/trashed it out of frustrations so I can return it. Experienced tip: get a Rigel quick finder if you want something that’ll work for a small grab and go. It straps onto the dew shield with a double sided tape to secure the base in place. Then snap on the head in place. It all fits my well-stuffed case!!!

fine

Does what I need, but is quite cheap. Picked this up as I needed a small, light, spotting scope for my astrophotography rig. When adjusting the alignment while it was on my scope, almost broke the adjustment screws, because they barely had enough range to get lined up with where my scope is pointing. So i was just baaarely able to get this to work.

No issues. Worked flawlessly out of the box unlike the celestron one.

I have just received my order and the red dot doesn’t seem to turn on, I’ve turned all the knobs every-which way and it’s Still not turning on, is there something I’m missing? Help