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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
William Optics William Optics 2013 ZenithStar 71mm Doublet ED Refractor with 2" 0.8x Reducer / Flattener # A-Z71A-P
William Optics William Optics 2013 ZenithStar 71mm f/5.9 Doublet ED Refractor # A-Z71A SF110V (2)
07745
07752
William Optics William Optics FLT 132 Fluoro Star 132mm f/7 Triplet Apo Refractor with Feather Touch Focuser
William Optics William Optics FLT 132 Fluoro Star 132mm f/7 Triplet Apo Refractor with R&P RotoLock Focuser # A-F132
William Optics William Optics FLT-132 f/7 Triplet Apo
William Optics William Optics FLT98 98mm f/6.3 Triplet Apo Refractor
William Optics William Optics FLT98 98mm f/6.3 Triplet Apo Refractor w/ 2" 0.8x Adjustable Reducer / Field Flattener 4
William Optics William Optics FLT98 98mm f/6.3 Triplet Apo Refractor w/ 2" 0.8x Adjustable Reducer / Field Flattener 4 & RotoLock Adapter
William Optics William Optics FLT98 98mm f/6.3 Triplet Apo Refractor with R&P RotoLock Focuser SF130V
William Optics William Optics Fluoro Star 110mm f/7 Triplet Apo Refractor # A-F110
William Optics William Optics Fluoro Star 110mm f/7 Triplet Apo Refractor with DDG Focuser # A-F110-DDG
William Optics William Optics Fluoro Star 110mm f/7 Triplet Apo Refractor with DDG Focuser plus Flat68 # A-F110-DDG
William Optics William Optics Fluoro Star 110mm f/7 Triplet Apo Refractor with Feather Touch Focuser # A-F110-FT
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 GT71 71mm f/5.9 Apo Refractor # A-F71GT
William Optics William Optics GT71 71mm f/5.9 Apo Refractor with 2" 0.8x Reducer / Flattener # A-F71GT-AP
William Optics William Optics GT81 81mm f/5.9 Apo Refractor - Gold # A-F81GT SF120V (2)
SF110V
07733
07753
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 SF120V (2)
SF110V
07733
07753
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 SF120V (2)
SF110V
07733
07753
William Optics William Optics Megrez 110 Doublet ED APO
William Optics William Optics Megrez 120 DDG Apo f/7.5 Refractor
William Optics William Optics Megrez 72mm f/6 Doublet Apo Refractor with DDG Integration
William Optics William Optics Megrez 90 Apo