I use the SV503 70 ED. For around 300 dollars it's been an absolutely amazing scope, I've managed to produce some good images with it. I know a doublet isn't for everyone, but on a budget, it's minimal quality sacrifice for saving a couple hundred bucks instead of a triplet in my opinion.

This is the first new telescope I've ever brought and it is perfect at the box my only issue is the dovetail is just a little bit small full telescope over wise performs perfectly to this day and I would have had it a year in November I need to used pretty much every week and lives outside permanently

This 102mm f/7 ED refractor is worth well more than I paid for it! The first time I took it out for a night of observing the sky, the sharp, contrasty views of star clusters and nebulae impressed me and my observing buddies. They spent as much time looking through this scope as through their own, much larger, reflector telescopes. The objective lens gives wonderful views. The "mechanics" of the scope are well-made and put together, including the retractable dew/light shield at the lens end and the rotating focuser assembly at the eyepiece end. Two small quibbles: The main focuser is a bit tight to turn, but another owner tells me it will loosen as I use the fouser. (The fine-focuser worked very well right out of the box!) There was no user manual or documentation include with the telescope. But I found some pages of information and directions, particularly about the focuser, at a Svbony page online. I plan to use this refractor purely for observing, not astro-imaging.

The image of the Moon is a composite made from two images taken with the SvBony SV305 camera then stitched together for the full image. It created some excitement on Facebook as it shows a lot of detail you would not expect from a telescope of this size. The image of Venus was also taken with the SV305 camera. The third image of the solar prominence was taken with a 4x Powermate Barlow, a Daystar Quark Hydrogen-Alpha filter and a QHY174GPS camera. It was a composite of two images, one of the prominence and the other of the sun’s surface. The camera was monochrome so color was added. This telescope is a solar and lunar imaging machine! WARNING: Do not use to view the sun without proper filtering as permanent damage can occur to your eyes or equipment!

I am in love with this refractor. This is a well-made piece of equipment from an underrated company that will make noise in the astrophotography world. The only important piece of extra equipment needed is a field flattener to counteract the field distortion (due to it being a relatively small aperture telescope), which does come at a bit of a steep price. However, the flattener is specifically made for the sv503 70ED. The fine-tuning knob is a must for any deep sky photography, and is very smooth on the 70ED. Personally, I'd like to see a little more resistance to moving to counteract any accidental bumps after fine-tuning the focus. The 503 also comes with pre-drilled mounting points where you can attach two accessories. Currently, I have a guide scope and laser pointer attached to mine and it stays rock solid. The only trouble I've had with my scope is the relatively short dovetail plate it comes stock with. In order to balance everything well, I had to turn the plate around to extend a balancing point and barely made it work. All in all, I would have to have purchased the 80 or even 102 refractor, but my current mount won't accept more weight than the 70ED. Don't be skeptical of the price! When I first came across it, it seemed very strange that and ED refractor would be so affordable, but decided to take the chance. And I'm glad I did! I am definitely an svbony fan now and have had nothing but wonderful interactions with their sales team. Thank you!

Nicely crafted telescope. No chromatic aberration. Very nice colours too. But (so only 4 stars) strong curvature of field already with APS-C Sensor. So flattener is a must for astrofotography. Improvments recommended: longer dovetail for balancing with astrocam.