Astronomical Telescope Accessories D114F900mm with Short-axis Secondary Mirror 25mm, Newton Reflector Spherical Mirror

Used this mirror to make a homemade Dobsonian just in time for the 2024 solar eclipse. The top of my images were a little out of focus due to my 3d printed focuser not supporting the camera's weight properly - but this wasn't the mirror's fault. I only paid around $20 for this mirror set, it came well packaged, dust free, and visually flawless - and the images I've seen through mine seemed great for the price.

Arrived intact and looks fine, but when installed, I couldn't achieve a sharp image. Stars aren't pinpoint. Mirrors I got from another manufacturer gave very sharp views.

The first set I got were damaged but the supplier replaced them quickly. They are working great and fit right in as needed. Could have used a slightly bigger secondary mirror, but I got it to fit no problem since it was smaller.

Showed up in great condition and work well! The optics won’t blow you out of the water, but for the price it’s hard to argue!

The primary and secondary mirrors are exactly as shown. No cracks or scratches. I wish it had a center dot but I can fix that. I wanted a cheap mirror to build a small telescope and I got what I wanted. My next move is to measure the focal length.

My old mirror was extremely dirty and when I attempted to clean it I scratched it I was not aware that when I ordered it I got both mirrors it was a great value and the mirrors fit perfectly as well as fitting perfectly and were perfect as far as shine. If you need mirrors for a Meade 4500 series or compatible telescope those will exceed your expectations.

I received a part with a chipped secondary. I contacted the vendor for a replacement secondary with no reply (edit: As it turns out, they did reply, but I never saw the email), so I sourced another secondary. After getting the new secondary in, primary installed, and collimated, I have struggled for multiple weeks to get a good image. I could not get a good sharp image with higher power lenses (150x, well under the theoretical capability of this primary). Defocused star performance is *abysmal* in spite of the airy disk having nearly perfect concentric rings (indicating good collimation). I repeated collimation quite a few times wondering if I had done anything poorly with that. I guess the old, dirty mirror is going back into the telescope. Maybe I'll give this primary to someone as a vanity mirror.

The media could not be loaded. Funciona muy bien por su precio, aunque no tiene la calidad de un espejo parabólico, no vas a conseguir uno por 25 dólares aprox... Así que es perfecto para tu primer telescopio casero.