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_through_the-_eyepiece_winners.thumb.jpg.236833c5815bb321211a43f4d5214ba8.jpg

iwols

what is meant exactly by 33mm imaging circle

Recommended Posts

just wondered what the above meant exactly cheers

Share this post


Link to post
Share on other sites

It’s the amount of even light that gets through the glass on your optics before the edges start to darken which is called Vignetting...it so imagers know whay light will hit the camera sensor..

Share this post


Link to post
Share on other sites

A bit vague term, but could be the following:

- Fully illuminated circle: 100% illumination within that region - so no vignetting as LightBucket pointed out

- Fully corrected circle: again region that does not suffer from optical aberrations. This term is even looser. It should mean diffraction limited field, but often scopes don't have that large diffraction limited field. That would be much much stricter requirement. You can understand fully corrected circle to be one where optical aberrations are small enough to be masked by usual suspects - like seeing and tracking precision. Ultimately, one should have evenly round and tight stars in this region (if not diffraction limited).

Imaging circle should, at least I believe so, satisfy above two conditions - to be both fully illuminated and fully corrected.

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.