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Guy's Math & Astro Blog

Tag Archives: brightness

Latest Ronchi or Knife-Edge Tester for Mirrors and Other Optics Using a WebCam

07 Friday Sep 2018

Posted by gfbrandenburg in astronomy, Optics, science, Telescope Making

≈ 1 Comment

Tags

brightness, color balance, exposure, focus, foucault, gain, knife edge, Ronchi, testing, webcam

Here is the latest incarnation of my webcam Ronchi and knife edge (or Foucault) tester. It’s taken quite a few iterations to get here, including removing all the unnecessary parts of the webcam. I attach a still photo and a short video. The setup does quite a nice job of allowing everybody to see what is happening. The only problem is setting the gain, focus, exposure, brightness, color balance, contrast, and so on in such a way that what you see on the screen resembles in any way what your eye can see quite easily.

IMG_1335

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