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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: 5 3/8” (137mm) to 5 5/8” (143mm)
Mike
Reviewed in the United States on September 16, 2024
Works perfect to view the sun.
Rocco
Reviewed in the United States on February 3, 2024
Telescope used was a 4.5 Orion starblast. Image is unedited taken with phone camera. Get one before the eclipse and they are sold out
Customer
Reviewed in the United States on December 22, 2023
Ordered a Celestron Starseeker 127 along with my best guess as to solar filter size from Spectum thru Amazon's site. Unfortunately, Unfortunately, even though the Amazon based Spectrum site has the Spectrum search box for matching filters to telescopes as an option, it doesn't work. So, Spectrum shiips the filter and I get to wait for the telescopes to see if it actually fits.. What also didn't work was Amazon's "in stock, ships immediately" promise. Telescope arrives after delays and several calls to Amazon, filter doesn't fit, now being returned. Bought correct filter directly thru Spectrum's site where I could confirm it is, in fact, the correct one. Telescope arrived 10 days after ordered, finally shipped, after much aggravation and broken promises, from Tracy, CA, just over 100 miles away.So, Spectrum does great, when Amazon doesn't get in the way.
Ryan B.
Reviewed in the United States on March 15, 2018
worked perfectly on my 400mm DSLR lens
G. West
Reviewed in the United States on September 12, 2017
I didn't burn out my eyes watching the solar eclipse. Thanks.
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