AstroSolar filter

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This is an AstroSolar filter. Inner diameter of the frame is 8.75" and the film is approximately 7.25" in diameter. This is a non-mylar film solution that achieves optical performance to the 1/10 wave surface accuracy and 94% Strehl. It is coated on two sides and is completely free of pinholes. This filter provides significant improvement over standard mylar or glass filters. Current versions of the filter retail at $140. Being offered here for only $65. I cover shipping and PP fees.