Focusing images on camera

[Nox]

Due to andromeda being very faint im unable to get a sharp picture when i take a photo with exposure due to being unable to focus using the nozzle. Does anyone have anyway of making sure it is focused using the nozzle before i take a 30 sec exposure of andromeda?

 

[happy-kat]

Hi

What camera are you using?

[ollypenrice]

You can't focus on galaxies and nebulae because they are fuzzy, you must focus on stars. You may need to find a bright star to find focus first. Zoom in to pixel scale and focus to get the star as small as possible. Also, just as you hit focus, you'll probably find that lots of tiny stars suddenly appear. That's the spot!

You might also try Googling Bahtinov Mask - a much-loved aid to finding focus.

Olly