Star Adventurer and Redcat 51 William Optics Redcat 51 · Trommel · ... · 30 · 964 · 2

Wow! Very impressive, Claudio!
So I think it will definitely be the RedCat 51.
It's amazing what you can get even without AutoGuiding or long exposure of 2 or 3 minutes 
Modifying my camera is probably my next step, but I'm not sure if I should upgrade my current one or if I should sell it and buy a modified one. It seems cheaper this way
Or are there any cheap astro-cameras?

there is always a risk with modifying, some people get more bloated stars or some people get other problems. I say if you have a camera that you don't use anymore, or if you are not gonna use your current one for daytime photography, then I would say go for it. you can ship it out to someone to do it for you, I got my camera used from eBay and did the modification on my own with help of a YouTube video. if you do decide to do it yourself than you should be okay with breaking your camera. for me it was quite a process, but it went great. even if you send it out to someone there is still a chance that something goes wrong, or that you are gonna have some problems after with it( overly bloated stars is I think the most popular). I don't have any visible problem with mine. I didn't want to mess with my expensive daytime camera the Sony a7ii so I just got a used Nikon d5300 for like 200 euros and modified it myself. if you do however want a dedicated astro cam, I would say go for it. the most popular that I have seen is the asi 553mc, which is an extremely good starting camera. me myself I bought a asi 183mc pro, but honestly if you don't mind the square sensor, having no amp glow is a real treat for a beginner in astro cooled cameras. in my opinion if you pair a astro cam with something like the asi air (as like a travel kit, or just in general, having a mini pc on the rig rather than lapotp outside was quite the difference for me) it will always win over a dslr, because the cooling alone makes it so much more enjoyable to edit the images. and it opens the door with longer exposure time without having more hot pixels than stars.

Werner:

Hi there!
At the moment I use my Canon 600d, my Star Adventurer and some lenses with lower focal lengths.
​​​Now I want to upgrade my kit and saw some of your posts here.
One telescope that I saw was the Redcat 51.
Is it a good one for the Star Adventurer or is it too heavy or is the focal length too long for it?
CS Tom

Redcat 51 is not suitable for older Staradventurer models. The current Staradventurer Gti version (controlled via both axes) is required. Otherwise you can hardly get round stars with a focal length of 250 mm.

This is only true without guiding! With guiding there will be no problem.

One last question:
What's actually the difference between the RedCat and the RedCat V2?

From the Agena website description of the Redcat:What's new about the RedCat 51 III vs. older RedCat 51s?There are three main differences between the RedCat 51 III and older versions:

1. RedCat 51 III has the same optics as its predecessors, but features a brand new focuser design: the WIFD. William Optics developed this patented focuser design as an improvement to standard drawtube style focusers. They have been replacing all of their existing telescopes to feature this upgraded design. Read on to learn about the WIFD focuser below.
2. As a result of this new focuser design, the RedCat 51 WIFD is also quite a bit heavier than the previous version. This version weighs 5.2 lbs (2.4 kg) vs. the RedCat 51 "U" which weighs 3.9 lbs (1.8 kg) with all accessories (dovetail, tube rings, and saddle) attached.
3. The back of the tilt adapter on the RedCat 51 III now features M54 x 0.75 threads. This means you may remove the M48 adapter and attach M54 accessories, which is the preferred thread size if you are imaging with a full frame sensor camera.