Off-axis glass filter for Celestron 11” Schmidt-Cassegrains

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This off-axis filter has a 101mm/4” clear aperture Type 2+ glass filter element. The filter is mounted on a white fiberboard insert in an aluminum cell with a 317mm/12.50” internal diameter to fit scopes with a maximum diameter of 316mm (12-7/16”).

It fits all versions of the Celestron 11” Schmidt-Cassegrain telescope (C11, CGE-1100, NexStar 11 GPS, etc.).

You can custom fit it to scopes with an O.D. of 311mm (12-1/4”) to 316mm (12-7/16”) by using the extra supplied self-adhesive felt.

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

Color of the given filter.
0 - Not a color filter
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33 oz
15 years
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Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(5.00)   # of Ratings: 1   (Only registered customers can rate)

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1. Dan on 4/30/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
I purchased this solar filter for my C-11 for use during the 2012 Annual Eclipse and Transit of Venus. I've mostly used this at home since during the time of the events, the weather precluded viewing at home, so I took my grab-n-go telescope to view it in locations with better viewing weather. At home I've used it to view the sunspots mostly. I've used it a little for photography, but I'm not an expert in that area. This is a "visual" wavelength filter, but that is what I expected. It is nice to have the extra magnification of the C11 and the "limited apeture" doesn't seem to make a difference since the brightness of the sun would be probably unbearable with the full apeture. Its construction seems to be just fine. It fits the telescope fine with just a single thickness of the supplied "velvet tape" applied to the edge. A useful accessory would be a vinyl case (my wife made me one) to keep the dust off the filter and possibly a hard case to protect it from impact while stored off the telescope (I am using the shipping box with the aforementionted vinyl case inside). I've ordered other Thousand Oaks filters and filter film and I've been very pleased with them and their service.
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Thousand Oaks - Off-axis glass filter for Celestron 11” Schmidt-Cassegrains

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Thousand Oaks - Off-axis glass filter for Celestron 11” Schmidt-Cassegrains
 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 5.00 | Users: 1)  Only registered users can submit ratings - Register Here
Our Product #: 71C11
Manufacturer Product #: 12500A
Price: $107.50  FREE ground shipping - Click for more info
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MSRP: $119.00

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This off-axis glass solar filter fits all 11” Celestron Schmidt-Cassegrains . . .

. . . our 34th year