Nice Ryan. But now you've got the HEQ5 I'd look at improving sub quality before gathering tonnes of data as Raymo says.
- Make sure you get polar alignment precise since you are not guiding yet.
- I'd consider other things before worrying about a UHC filter. I've got one but rarely use it (and I have Sydney suburban skies)
- I'd also consider get the cheapy laptop (or a long USB cable to a computer in your house) and AUTOMATE! Not sure what you are doing now, but this will make things much easier, give better focusing. When I had my 550D I used EOS utilities (free, or backyard eos - costs a bit) and then astrophotography tool (only about $25). They are really easy to setup with a DSLR. Easy focusing (especially with a Bahtinov mask) and setting up sequences for lights/darks/flats.
You could even do this before starting guiding if you retsrict subs to 0.5-1min. But guiding will help AND its not that hard, especially with the likes of PhD2, although there is an initial $$ outlay for a camera/guidscope. But one step at a time.
Sorry if I've ranted on a bit here. And again nice M42!
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