“Will this work with my late 1980's Celestron C 90 1000mm f11? Thanks”
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A late 1980s C90 is near where the eyepiece size for this telescope transitioned from 0.95 inches to the modern standard of 1.25 inches. If the existing eyepieces with you older C90 are 1.25 inches in diameter, then the Astromaster Accessory kit will work with this telescope. If the existing eyepieces are just under an inch in diameter, the Astromaster kit will not fit this particular telescope.
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