ZWO D21 AR protect window thickness1.1mm

I bought the Zenith Star 103 last year, it had 30% discount and it is my first telescope. I use it with a 0.8 reducer on an AM5 mount and connected to a ZWO 183 mono camera. This focal length (575mm with reducer) is versatile, it can be used especially for Lunar imaging and it is also quite fit for some of the most popular deep sky objects too. The moon photography I get with this scope is excellent, beyond what I expected. I also captured some great images of Orion Nebula, Horsehead, the Pleiades, M33, Rosette, Flaming Star etc. After one year what I can say is that I love this scope, I will certainly keep it. I might buy another one with a shorter focal length to cover different targets, maybe Redcat 51 or ZS 61. The convenient focuser and its 360° rotation ability in Zenith Star scopes is something I'd like to keep.