0.965 and 1.25 M28.6x0.6 inches Solar Filter for Astronomical Telescope Optical Filter Lens Astronomical Telescope Parts and Accessories Suitable for occasions: watching the rising sun, sunset. Please do not use it especially when the sun is very strong (at noon) 0.965 inches / 2.45cm For the caliber of eyepieces (0.965 inches / 2.45cm) Suitable for occasions: watching the rising sun, sunset. Please do not use it especially when the sun is very strong (at noon) Specifications: Item Name: solar filter Model Number: OF-12-0.96 Material: optical glass lens Frame Material: aluminum alloy Shape: round Colour: black Suitable Occasion: Watching sunrise and sunset. Unsuitable occasion: Watching strong sunlight (noon) 1.25inches / 31.7mm For the caliber of eyepieces (1.25 inches / 31.7mm) Suitable for occasions: watching the rising sun, sunset. Please do not use it especially when the sun is very strong (at noon) Specifications: Item Name: black solar filter Model Number: OF-12-1.25 Material: optical glass lens, aluminum alloy Filter Caliber Size: 1.25inches / 31.7mm Metric Coarse Thread: M30x1 Inch Fine Thread: M28x0.6 Shape: round Colour: black Weight: 9 g Suitable Occasion: Watching sunrise and sunset. Unsuitable occasion: Watching strong sunlight (noon)