Jump to content

 

1825338873_SNRPN2021banner.jpg.68bf12c7791f26559c66cf7bce79fe3d.jpg

 

Aperture vs F/stop - Newbie Question


Recommended Posts

Dear All,

At the moment I'm having a go a imagine DSOs using a LX modified webcam and my 400mm SW Equinox 66 refractor (66mm aperture, f/6). My question is, is it the f/stop alone that determines how much light a scope can 'pull in' or the aperture as well?

What I mean is, will a 120mm f/6 scope will require less exposure time than a 66mm f/6 scope (to achieve the same image)? My sense is that the bigger aperture will have a big effect?

Thanks for any help,

Nick

Link to comment
Share on other sites

Yes, this comes up a lot. A slow scope is, on non point sources, a slow scope, however big it is. And vice versa, a small fast scope is still fast. If you want to get DSOs to show on a webcam you want all the speed you can get plus a short FL so things will fit on your small chip.

Olly

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.