Full aperture glass filter for Astro-Tech AT66 refractors


Availability: More on the way

This full aperture glass solar filter fits the Astro-Tech AT-66 refractors . . .
Our Product #: 71AT66
Thousand Oaks Product #: 3500

Product Description

This full aperture filter has a 76mm/3" clear aperture Type 2+ glass filter element. The filter is mounted in an aluminum cell that has an 89.5mm/3.52" internal diameter to fit scopes with a maximum diameter of 87mm (3-7/16").

It fits the 85mm o.d. Astro-Tech AT66 apo refractor by applying tabs of the thick supplied self-adhesive felt to the inside of the filter cell.

You can custom fit it to scopes with an O.D. of 82.8mm (3-1/4") to 87mm (3-7/16") by using the extra supplied self-adhesive felt (it comes with two 12" long x 3/4" wide strips, one measuring 1.1mm thick and the second 2.2mm).

Always remember to install the solar filter before pointing your telescope at the Sun to avoid instant and irreversible damage to your eyesight.

Tech Details

Color 0 - Not a color filter
Weight 6 oz.
Warranty 15 years


Review by:
I use this for casual solar observation and it does what it should. Probably overkill for my use case but it's future proof for when I'm ready to start photographing. (Posted on 1/13/2019)
Review by:
I use this solar filter on my guide scope for solar autoguiding with LuSol Guide. Gives a clear, unobstructed field of view and a crisp image for full disk solar guiding. (Posted on 10/24/2018)
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