How do I find the right size filter to order?

When ordering telescope, spotting scope, binocular or camera filters you need to know the outside diameter of your optical tube. For a correct fit, measure the widest distance across the end of your optical tube from outside edge to outside edge.

4 thoughts on “How do I find the right size filter to order?

  1. I have a Meade 14″ LX200. Bought it in 2001.
    I need your part # & price for a solar filter that fits on the end of scope.
    Thanks
    Mike Weatherly
    Savannah, Ga 31419

    1. Hi Mike,
      Please email me at Info@seymoursolar.com, and I’ll be happy to help you. In the meantime, you can check your filter size by measuring the end of your scope from side to side, or directly across the full aperture. You want to go from the outside edge to outside edge. Our filters slip over the end of the scope so the measurement needs to be slightly bigger than the outside of your scope. Hope this helps.

  2. I am looking to buy a Solar Filter to fit my Skywatcher Esprit 150 Refractor, I already have a couple of Seymour Filters which fit my Celestron CPC 9.25 (SF 1075), and my Explore Scientific 127 mm Refractor (SF 725) which I purchased from Rother Valley Optics in the UK, but they do not appear to stock the appropriate filter to fit the Esprit 150.

    The outside diameter of the dewcap of the above refractor is exactly 8 in or 203 mm, but Rother Valley Optics do not appear to stock anything between the SF 750 and the SF 9187.

    Incidentally I have also lost one of the plastic screws that fits my SF 1075 filter, it is it possible to obtain a replacement.

    Many thanks

    John Turley

    1. Please email me at Info@seymoursolar.com, and I’ll be happy to help you. In the meantime, you can check your filter size by measuring the end of your scope from side to side, or directly across the full aperture. You want to go from the outside edge to outside edge. Our filters slip over the end of the scope so the measurement needs to be slightly bigger than the outside of your scope. Hope this helps. Please check our website for a picture and instruction on how to correctly measure your aperture. Happy Viewing!
      Holly

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