Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_dslr_mirrorlesss_winners.thumb.jpg.9deb4a8db27e7485a7bb99d98667c94e.jpg

William Jones

Guide Scope/Guide Camera FOV Question

Recommended Posts

Hi guys

Can anyone help me work out the FOV  I am getting when I use my guide scope with guide camera?

The kit I have is:

BST 50mm mini guide scope (f3.2) 162mm F.L

With an Altair Astro GPCAMARO130C  guide camera

I am hoping the FOV is between 1deg and 2.5degs

Thanks

Share this post


Link to post
Share on other sites

Sensor Size: 1/3" diagonal (4.8x3.6mm)
Pixel size microns: 3.75x3.75 um
Resolution in pixels: 1280x960

BST 50mm mini guide scope (f3.2) 162mm F.L

 

Either...


Image scale (arc-seconds/mm) = 206265 / Focal Length (mm)
        = 206265 / 162mm
        = 1273.24 arc-seconds/mm

Field of view = 4.8x3.6mm * 1273.24 arc-seconds/mm
     = 6112x4584 arc-seconds
     = ~1.7x1.27 degrees
    

or...
    
Image scale (arc-seconds/px) = 206.265 * Pixel Size (um) / Focal Length (mm).
        = (206.265 * 3.75um) / 162mm
        = 4.775 arc-seconds/pixel
       
Field of view = 1280x960px * 4.775 arc-seconds/pixel
     = 6112x4584 arc-seconds
     = ~1.7x1.27 degrees

Share this post


Link to post
Share on other sites

Yes those are the theory calculations - you can load a picture into nova.astrometry.com which will plate solve it and tell you exactly as the focal length might not be quite as advertised.

Whatever it'll work for sharpcap polar alignment routine :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.