SV179 red dot reflex viewfinder its simple, affordable, and effective. The red dot sighting device makes aiming your telescope so much easier.
ZWO Seestar S30 Pro Smart Telescope – Automated Astrophotography & Night Sky Imaging
As expected from Pegasus Astro.
I've used one before for camera lenses and wide field imaging. This longer one is for my 90mm triplet refractor. I find Setting 1 works well most of the time, saving a bit of power. You only need to warm things to a fraction above dewpoint to stay dew-free.