Welcome to IIS
HEQ5 mount , great choice
Redcat 51 scope , great choice
Using ASI533MC will result in a pixel scale of 3.1 arc sec per pixel ( way under sampled )
Using ASI183MC will result in a pixel scale of 1.9 arc sec per pixel ( reasonably good sampling ) This camera is slightly cheaper than the ASI533MC too
You can just capture unguided subframes to start off with , autoguiding can come later ( with tight polar alignment you can push 60sec subframes which is more than adequate for now )
The ASI183MC will require a USB3 cable for data and for cooling a Powertech power adapter 12V 7.5amp ( same as one already mentioned with photo ) or alternatively the ZWO power supply with a suitable power cord 2.1mm centre positive
Good luck and enjoy this wonderful hobby
Martin
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