Lunt BF1800 1.25 inch Blocking Filter in Diagonal – Ref. 0553006

Lunt BF1800 1.25 inch Blocking Filter in Diagonal – Ref. 0553006

Description

The Lunt BF1800 blocking filter is a crucial component for H-alpha solar observation. Integrated into a 90° 1.25 inch diagonal, it is designed to be used with Lunt Solar Systems' H-alpha setups.

This filter is suitable for telescopes with a maximum focal length of 1620 mm. It cannot be used standalone and must be paired with a Lunt H-alpha filter or dedicated solar telescope.

The diagonal features a T2 (M42x0.75 mm) thread on the eyepiece side, allowing the attachment of compatible photographic accessories.

Technical specifications

• Filter type: BF1800 blocking filter

• Filter diameter: 18 mm

• Format: integrated into a 90° diagonal

• Telescope side connection: 1.25 inch (31.75 mm) barrel

• Eyepiece side connection: 1.25 inch barrel with T2 thread (M42x0.75 mm)

• Maximum telescope focal length: 1620 mm

• Usage: only with Lunt H-alpha systems

• EAN: 4007922035802

User benefits

• Safe H-alpha solar observation

• Compatibility with telescopes up to 1620 mm focal length

• Integrated diagonal for ease of use

• T2 connection for attaching photographic accessories

Additional information

• The BF1800 blocking filter cannot be used without a Lunt H-alpha filter or dedicated solar telescope.

• For telescopes with focal lengths exceeding 1620 mm, it is recommended to use a larger blocking filter (BF3400).