ASTF solar filter for 140mm telescopes

Safe for solar observing and photography with all high-end telescopes and extreme telephoto lenses. Suitable for the highest magnifications and detailed observation of individual sunspots.

AstroSolar OD 5.0 ​​safety film, tension-free mounted on a temperature-compensated cell
No astigmatism during observation in winter or with temperature changes in summer.

Scope of delivery: The ASTF filter with apertures of 80 to 180 mm (200–280 mm not yet available) comes with two sets of 38 mm long centering pins. Three pins with a 10 mm diameter and three pins with a 20 mm diameter, adjustable to the diameter of your telescope tube or dew cap. Also included are three securing straps with adhesive pads and three rubber plugs for covering unused holes, as well as assembly instructions.

Specs:

• Clear opening: 140mm
• Diameter: 230mm
• Construction type: white light
• Suitable for MAK type telescopes