Solar Filter Quick Reference Guide

Choosing a solar filter for your telescope can be a difficult decision when there are so many choices.  The best way to narrow down your selection is to find the filters that fit first and to find this out, you'll need your telescope's outer diameter.  

Measuring your telescope diameter is easy to do with a standard ruler. Be sure to measure across the widest part of your telescope where the filter will attach, to the outside edge of the telescope tube. Take your time to ensure an accurate measurement as you will need to be within a few millimeters for a proper fit. a Filter manufacturers typically provide sizes in millimeters.

Once you have your diameter, use this handy chart to find the filters that are right for you. Click the filter name to visit that filter's page on our site.  A filter must be larger than the outer diameter of your telescope or binoculars, but you do not want a filter to be more than 5-10mm larger than your outer diameter or you may not be able to get a secure fit.   Many filters are packaged with a small roll of self-adhesive felt to shim the filter.

Can't find something that fits or want to make your own filters? Checkout our selection of Baader Astro-Solar Film.

Minimum Outer Diameter Maximum Outer Diameter Filter
41mm 48mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 41MM-48MM
42mm 48mm ASTROZAP - 41MM-48MM BINOCULAR GLASS SOLAR FILTER PAIR
44mm 48mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 50MM OUTER CELL
48mm 54mm ASTROZAP - 48MM-54MM BINOCULAR GLASS SOLAR FILTER PAIR
48mm 54mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 48MM-54MM
51mm 57mm  ASTROZAP - 51MM-57MM BINOCULAR GLASS SOLAR FILTER PAIR
54mm 58mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 60MM OUTER CELL
55mm 70mm BAADER - 50MM APERTURE ASTROSOLAR BINOCULAR FILTER
57mm 67mm ASTROZAP - 60MM-67MM BINOCULAR GLASS SOLAR FILTER PAIR
60mm 67mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 60MM-67MM
64mm 68mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 70MM OUTER CELL
65mm 80mm BAADER - 60MM APERTURE ASTROSOLAR BINOCULAR FILTER
67mm 73mm ASTROZAP - 67MM-73MM BINOCULAR GLASS SOLAR FILTER PAIR
67mm 73mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 67MM-73MM
70mm 85mm BAADER - 65MM APERTURE ASTROSOLAR SPOTTER FILTER
70mm 74mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 76MM OUTER CELL
73mm 79mm ASTROZAP - 73MM-79MM BINOCULAR GLASS SOLAR FILTER PAIR
73mm 79mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 73MM-79MM
75mm 90mm BAADER - 70MM APERTURE ASTROSOLAR BINOCULAR FILTER
76mm 80mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 82MM OUTER CELL
79mm 86mm ASTROZAP - 79MM-86MM BINOCULAR GLASS SOLAR FILTER PAIR
79mm 86mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 79MM-86MM
84mm 88mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 90MM OUTER CELL
85mm 100mm BAADER - 80MM APERTURE ASTROSOLAR BINOCULAR FILTER
85mm 100mm BAADER - 80MM APERTURE ASTROSOLAR SPOTTER FILTER
86mm 92mm ASTROZAP - 86MM-92MM BINOCULAR GLASS SOLAR FILTER PAIR
86mm 92mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 86MM-92MM
89mm 93mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 95MM OUTER CELL
92mm 98mm ASTROZAP - 92MM-98MM BINOCULAR GLASS SOLAR FILTER PAIR
92mm 98mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 92MM-98MM
95mm 99mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 101MM OUTER CELL
98mm 105mm ASTROZAP - 98MM-105MM BINOCULAR GLASS SOLAR FILTER PAIR
98mm 105mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 98MM-105MM
100mm 140mm BAADER - 80MM APERTURE ASTROSOLAR TELESCOPE FILTER
102mm 106mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 108MM OUTER CELL
105mm 111mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 105MM-111MM
105mm 120mm BAADER - 100MM APERTURE ASTROSOLAR BINOCULAR FILTER
105mm 120mm BAADER - 100MM APERTURE ASTROSOLAR SPOTTER FILTER
108mm 112mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 114MM OUTER CELL
111mm 117mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 111MM-117MM
114mm 118mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 120MM OUTER CELL
117mm 124mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 117MM-124MM
120mm 160mm BAADER - 100MM APERTURE ASTROSOLAR TELESCOPE FILTER
120mm 135mm BAADER - 115MM APERTURE ASTROSOLAR SPOTTER FILTER
121mm 125mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 127MM OUTER CELL
124mm 130mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 124MM-130MM
127mm 131mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 133MM OUTER CELL
137mm 143mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 137MM-143MM
140mm 180mm BAADER - 120MM APERTURE ASTROSOLAR TELESCOPE FILTER
140mm 144mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 146MM OUTER CELL
143mm 149mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 143MM-149MM
146mm 150mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 152MM OUTER CELL
148mm 178mm BAADER - 130MM APERTURE ASTROSOLAR SPOTTER FILTER
149mm 156mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 149MM-156MM
152mm 156mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 158MM OUTER CELL
156mm 162mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 156MM-162MM
159mm 163mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 165MM OUTER CELL
160mm 200mm BAADER - 140MM APERTURE ASTROSOLAR TELESCOPE FILTER
168mm 198mm BAADER - 150MM APERTURE ASTROSOLAR SPOTTER FILTER
171mm 178mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 171MM-178MM
175mm 179mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 181MM OUTER CELL
180mm 220mm BAADER - 160MM APERTURE ASTROSOLAR TELESCOPE FILTER
181mm 187mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 181MM-187MM
184mm 188mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 190MM OUTER CELL
194mm 202mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 194MM-199MM
197mm 201mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 203MM OUTER CELL
200mm 240mm BAADER - 180MM APERTURE ASTROSOLAR TELESCOPE FILTER
203mm 210mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 203MM-210MM
206mm 210mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 212MM OUTER CELL
213mm 219mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 213MM-219MM
216mm 220mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 213MM-219MM
220mm 260mm BAADER - 200MM APERTURE ASTROSOLAR TELESCOPE FILTER
224mm 230mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 224MM-230MM
224mm 230mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 224MM-230MM
230mm 234mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 236MM OUTER CELL
232mm 238mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 232MM-238MM
232mm 238mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 232MM-238MM
235mm 239mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 241MM OUTER CELL
238mm 244mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 238MM-244MM
238mm 244mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 238MM-244MM
241mm 245mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 247MM OUTER CELL
244mm 251mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 244MM-251MM
244mm 251mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 244MM-251MM
248mm 252mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 254MM OUTER CELL
257mm 264mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 257MM-264MM
257mm 264mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 257MM-264MM
260mm 300mm BAADER - 240MM APERTURE ASTROSOLAR TELESCOPE FILTER
260mm 264mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 266MM OUTER CELL
264mm 270mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 264MM-270MM
267mm 271mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 273MM OUTER CELL
283mm 289mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 283MM-289MM
283mm 289mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 283MM-289MM
286mm 290mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 292MM OUTER CELL
295mm 302mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 295MM-302MM
295mm 302mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 295MM-302MM
299mm 303mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 305MM OUTER CELL
300mm 340mm BAADER - 280MM APERTURE ASTROSOLAR TELESCOPE FILTER
305mm 309mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 311MM OUTER CELL
308mm 314mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 308MM-314MM
308mm 314mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 303MM-314MM
311mm 315mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 317MM OUTER CELL
321mm 327mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 321MM-327MM
321mm 327mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 321MM-327MM
333mm 347mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 349MM OUTER CELL
340mm 346mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 340MM-346MM
378mm 384mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 378MM-384MM
378mm 384mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 378MM-384MM
381mm 385mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 387MM OUTER CELL
391mm 397mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 391MM-397MM
397mm 403mm ASTROZAP - GLASS SOLAR FILTER - FULL APERTURE 397MM-403MM
397mm 403mm ASTROZAP - GLASS SOLAR FILTER - OFF-AXIS 397MM-403MM
400mm 404mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 406MM OUTER CELL
426mm 430mm THOUSAND OAKS - FULL APERTURE SOLARLITE FILTER - 432MM OUTER CELL
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