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Solar Filter Lookup Tool

You can use the table below to find a suitable solar filter for you telescope.

This table was compiled by Agena AstroProducts using many inputs from companies and individuals (thank you!) and a lot of cross-referencing. While we believe that this compilation should be accurate, it is based on data provided by others, and we have no way of verifying if every combination below is perfect or not. Hence, please use this table as a general guide. It is still your responsibility to measure your telescope’s tube/dewshield size and compare it with the specs of the solar filter.

If you do not see your telescope listed below, please contact us with careful measurements of the inside and outside diameter of your telescope tube (preferably in mm), and they will be happy to look up what might work.

See errors below that need to be corrected? Know tube dimensions or have telescope-filter compatibility info not listed below? We’d love to hear from you and add to this table for the benefit of everyone. Thank you.

Filter Fit Notes

  1. 1. Fits the inside diameter of telescope
  2. 2. Works with optional 20mm screws sold by Agena

Brand Name Baader Planetarium Agena AstroProducts Spectrum Telescope Meade Celestron Orion
Coronado Coronado PST Personal Solar Telescope with Case and Malta Table Top Tripod Mount
Coronado Meade / Coronado 40mm 0.5A PST - Double Stack H-Alpha Solar Telescope
Coronado Meade / Coronado 40mm f/10 PST H-Alpha Personal Solar Telescope
Coronado Meade / Coronado 40mm f/10 PST H-Alpha Personal Solar Telescope with Case
William Optics William Optics GT102 102mm f/6.9 Apo Refractor - Limited 20th Anniversary Edition (Blue) # A-F102GTSB
William Optics William Optics GT102 102mm f/6.9 Apo Refractor # A-F102GT SF130V
William Optics William Optics GT102 102mm f/6.9 Apo Refractor w/ DDG Focuser # A-F102GT-DDG
William Optics William Optics GT81 81mm f/5.9 Apo Refractor - Gold # A-F81GT SF110V
SF120V (2)
07753
07733
William Optics William Optics GT81 81mm f/5.9 Apo Refractor w/ Field Flattener 6A & Soft Carry Case
William Optics William Optics GT81 81mm f/5.9 Apo Refractor with DDG Focuser - Gold # A-F81GT-DDG
William Optics William Optics GT81 81mm f/5.9 Blue Apo Refractor - Limited Edition SF110V
SF120V (2)
07753
07733
William Optics William Optics GTF102 102mm f/7.7 Apo Refractor with Built-In Flattener & DDG Focuser # A-F102GTA-DDG
William Optics William Optics GTF102 102mm f/7.7 Apo Refractor with Built-In Flattener # A-F102GTA SF130V
William Optics William Optics GTF81 81mm Apo Refractor with Built-In Flattener & DDG Focuser # A-F81GTA-DDG
William Optics William Optics GTF81 81mm f/6.6 Apo Refractor with Built-In Flattener # A-F81GTA SF110V
SF120V (2)
07753
07733