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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: 4 5/8” (117mm) to 4 7/8” (124mm)
mjp2
2025-03-28 12:17:44
It's exactly what you'd expect. Sturdy glass with great light filtering providing an amazing view of the sun. It fits my SV503 102ED perfectly.
Shawty
2025-02-07 11:32:05
Wow the Sun as I have never seen. You need to get this wonderful product.
David Ruiz
2025-01-28 10:28:03
Didn't like the tint. I was looking for a white tint filter, but from got confused with many options and ordered the incorrect one. Besides that is a solid electrion: the materiales feels like premium. Fits just right on my 105 mm telescope (a MK105 from SvBony).
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