Diffraction Pattern of My Cracked LX90

Published on April 16, 2009 in Photo and Telescopes. View Comments Tags: , .

diffraction-pattern-cracked-lx90
The diffraction pattern of the 8″ LX90AT with the broken corrector plate

hadar-cracked-lx90-lens

The image of the Hadar (Beta Centauri) through the broken 8″ LX90AT. Look, the star image is no longer pinpoint.

saturn-cracked-lx90-lens
Saturn delivered by the 8″ LX90AT with the broken corrector plate. It looks like the Saturn is being engulfed by a black hole.

Now, the main character~
cracked-lx90

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  • I just observed the moon just now. The image seems to be flawless. There is only a slight degrade of image quality when I use 12.5mm eyepiece with 2x barlow lens, resulting a magnification of 333X. Well, I will call up Meade tomorrow to see how much it cost to fix the telescope.
  • Have you tried to use a mask in front of your corrector? maibe a Harttman mask with three circular holes could work.
    It would reduce the light that your scope recolects but it could serve to see bright objects.
  • I am going to try to block cracked part by using a customized cardboard. It
    will enhance the view for sure but the amount of light gathered will be
    reduced by around 15%. A Harttman mask is not a good solution as it will block
    quite a lot of incoming photons.

    Regards.

    -Robin Lee
    Founder of CHHS Astronomy Club, Kluang, Johor, Malaysia
    My Astronomy Blog- www.AstronomyNotes.net
    Or Astrobin.com
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