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While we are talking Star test... Can you explain

Started by farmerdavid, 06/21/2006 07:49PM
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Posted 06/21/2006 07:49PM Opening Post
David Pitre
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Location: Manor TX, US

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My 9.24" SCT shows a star test with an exceptionaly bright first diffraction ring. Outside of focus it it sharply defined. Inside of focus it it large and blurred.
Can anyone comment on this?
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Posted 06/21/2006 11:14PM #1
Floyd Blue
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Location: Bakersfield CA, US

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It sounds like the lower right in this picture. Spherical aberration.

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[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue grin
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