Helios Glass Telescope Solar Filter by Seymour Solar (4.25" (108mm). Fits Optical Tube Diameter 3 7/8" (99mm) to 4 1/8" (105mm))

2" (50mm). Fits Optical Tube Diameter 1 5/8" (41mm) to 1 7/8" (47mm)

2.25" (57mm). Fits Optical Tube Diameter 1 7/8" (48mm) to 2 1/8" (53mm)

2.5" (63mm). Fits Optical Tube Diameter 2 1/8" (54mm) to 2 3/8" (59mm)

2.75" (70mm). Fits Optical Tube Diameter 2 3/8" (60mm) to 2 5/8" (66mm)

3" (76mm). Fits Optical Tube Diameter 2 5/8" (68mm) to 2 7/8" (73mm)

3.25" (82mm). Fits Optical Tube Diameter 2 7/8" (74mm) to 3 1/8" (79mm)

3.5" (90mm). Fits Optical Tube Diameter 3 1/8" (80mm) to 3 3/8" (86mm)

3.75" (95mm). Fits Optical Tube Diameter 3 3/8" (87mm) to 3 5/8" (92mm)

4" (101mm). Fits Optical Tube Diameter 3 5/8" (93mm) to 3 7/8" (98mm)

4.25" (108mm). Fits Optical Tube Diameter 3 7/8" (99mm) to 4 1/8" (105mm)

4.5" (114mm). Fits Optical Tube Diameter 4 1/8" (106mm) to 4 3/8" (111mm)

4.75" (121mm). Fits Optical Tube Diameter 4 3/8" (112mm) to 4 5/8" (117mm)

5" (127mm). Fits Optical Tube Diameter 4 5/8" (118mm) to 4 7/8" (124mm)

5.25" (133mm). Fits Optical Tube Diameter 4 7/8" (125mm) to 5 1/8" (130mm)

5.5" (140mm). Fits Optical Tube Diameter 5 1/8" (131mm) to 5 3/8" (136mm)

5.75" (146mm). Fits Optical Tube Diameter 5 3/8" (137mm) to 5 5/8" (143mm)

6" (152mm). Fits Optical Tube Diameter 5 5/8" (144mm) to 5 7/8" (149mm)

6.25" (158mm). Fits Optical Tube Diameter 5 7/8" (150mm) to 6 1/8" (156mm)

6.75" (171mm). Fits Optical Tube Diameter 6 3/8" (163mm) to 6 5/8" (168mm)

7" (178mm) . Fits Optical Tube Diameter 6 5/8" (169mm) to 6 7/8" (174mm)

7.25" (184mm). Fits Optical Tube Diameter 6 7/8" (175mm) to 7 1/8" (180mm)

7.5" (190mm). Fits Optical Tube Diameter 7 1/8" (181mm) to 7 3/8" (187mm)

8" (203mm). Fits Optical Tube Diameter 7 5/8" (193mm) to 7 7/8" (202mm)

8.376" (212mm). Fits Optical Tube Diameter 8" (203mm) to 8 1/4" (210mm)

8.75" (222mm). Fits Optical Tube Diameter 8 3/8" (213mm) to 8 5/8" (219mm)

9.5" (241mm). Fits Optical Tube Diameter 9 1/8" (232mm) to 9 3/8" (238mm)

9.75" (247mm) . Fits Optical Tube Diameter 9 3/8" (239mm) to 9 5/8" (244mm)

10" (254mm). Fits Optical Tube Diameter 9 5/8" (245mm) to 9 7/8" (251mm)

10.5" (266mm). Fits Optical Tube Diameter 10 1/8" (257mm) to 10 3/8" (264mm)

10.75" (273mm). Fits Optical Tube Diameter 10 3/8" (265mm) to 10 5/8" (270mm)

12" (305mm). Fits Optical Tube Diameter 11 5/8" (295mm) to 11 7/8" (302mm)

12.5" (317mm). Fits Optical Tube Diameter 12 1/8" (308mm) to 12 3/8" (314mm)

13" (330mm). Fits Optical Tube Diameter 12 5/8" (321mm) to 12 7/8" (327mm)

13.75" (349mm). Fits Optical Tube Diameter 13 3/8" (340mm) to 13 5/8" (346mm)

14.5" (368mm). Fits Optical Tube Diameter 14 1/8" (358mm) to 14 3/8" (365mm)

15.25" (387mm). Fits Optical Tube Diameter 14 7/8" (378mm) to 15 1/8" (384mm)

15.75" (400mm). Fits Optical Tube Diameter 15 3/8" (390mm) to 15 5/8" (396mm)

16" (406mm). Fits Optical Tube Diameter 15 5/8" (397mm) to 15 7/8" (403mm)