Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

How do I test reason for bright/low contrast image in refractors?


Recommended Posts

I’m currently testing out two different 66mm APOs for use as imaging scopes. My initial testing seems to show that the optical aberration is broadly similar in each scope.

http://stargazerslounge.com/topic/257336-66mm-apo-comparison-what-do-you-think/

However, one scope seems to have produced a considerably brighter image.

post-586-0-54380200-1448404396_thumb.jpgpost-586-0-36651300-1448404408_thumb.jpg

Now this may be down to increased light pollution from the Moon, but it could well be down to different optical behaviour of the slightly different scopes. If the difference is repeatable, I need to find out what is causing the effect. As I see it (i.e. I may be wrong!) there would be two possible reasons for the different behaviour of each scope.

1 – improved light transmission

2 – lower contrast due to poor design and or coatings

How would I test which one I have?

Thanks

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • 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.