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Your cart is empty.How do I determine the size of filter to order? Spectrum Telescope filters slip over the sky end of the optical tube of the telescope. To get the proper fit, measure the outer diameter by using a caliper, ruler, or tape measure. Measure the widest distance of the telescope end starting from the exterior of the casing, across the center and to the exterior part of the casing of the other side. After you have your measurements, you should order a size larger than what you measured. This is because your measurement is being compared with the solar filter ID (inside diameter). For instance: If you measure 4″ across the optical tube end needs a 4.25” size solar filter. This will make it just a little bigger than the measurement you took. Your O.D. Measurement: 9 1/8” (232mm) to 9 3/8” (238mm) ST950G This 9.50" (241mm) Glass Solar Filter is compatible with Meade's: LX90 8" LX200 8" LightSwitch 8" LX70 8" telescope.
William B. Dean
Reviewed in the United States on February 12, 2024
Perect fit and nice quality
S. Bendick
Reviewed in the United States on June 25, 2023
This is a 9.5" filter, which is the same size as the Orion XT8's tube, even with the trim removed. The proper filter for the XT8 from Spectrum is the ST1050G1. Spectrum was super responsive and sent me the bigger filter as a swap. The filter itself is super. Amazon needs to fix the listing.
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