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Old 28-09-2020, 10:24 AM
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multiweb (Marc)
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multiweb is offline
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 20,089
Originally Posted by SB View Post
Thanks Marc,
Here is another image of the Orion Core (2 x 10 min exposures) taken with the IR Pass filter. Stars appear a little tighter this time.

Here's a couple of comparisons for you to illustrate what I was talking about. Let me know if you are having problems viewing the links. I'm using the same filter as yours. Astronomik Pro Planet 742nm.

Triplet APO (Triplet FPL53) Notice the clips diffractions

FSQ106N (fluorite quadruplet)

CN-212 (classical cassegrain - no glass)
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