Review on 🔭 SVBONY 1.25-inch 90° Zenith Diagonal Mirror for Refractor and Cassegrain Telescopes – Astronomical Telescope Accessory by Tracey Brown

At first I liked this diagonal. then I looked at the diffraction pattern which showed my scope was far from collimating. the diffraction pattern looked like this: (((((((o) The problem is that this is a refractor, so it's unlikely. I checked without the diagonal and everything was fine! I removed the diagonal and put through the eyepiece tube They are incorrectly positioned in the plastic housing.The centering housing itself is not square and the tubes are not perpendicular to each other.A complete monetary and Waste of time.diagonal and it is perfectly collimated as shown in the photo.I spent extra money and got a real diagonal.