About the Lunt B1800 Blocking Filter - 2" Extension Tube w/ T2 and 2" Connection...
The Lunt Solar Systems B1800 Blocking Filter is its own unique system which houses an additional filter in a T2-2" straight-through extension tube. The blocking filter is required element for the safety and performance of any solar package - including Lunt H-Alpha parts. The Lunt Solar Systems B1800 filter will provide a full disk image of the Sun with telescopes that have a maximum of 1800mm of focal length.
Choose your Lunt Solar Systems Blocking Filter carefully for your telescope''s focal length. If you were to use a larger blocking filter than is necessary to achieve a full disk image on your telescope system, the result may show image "ghosts" at the edge of the field of view! For best performance, be sure to pair your Lunt Solar Systems h-Alpha filter with the proper sized Lunt blocking filter. Because Lunt Solar Systems blocking filters contain a unique filter system. Lunt will only warranty the safety and/or performance of their systems when a Lunt blocking filter is paired with a Lunt Solar Systems Etalon system.
Lunt B1800 Blocking Filter - 2" Extension Tube w/ T2 and 2" Connection Features...
- Unique filter system
- Provides full disk image of the Sun with telescopes that have a maximum of 1800mm focal length
- Housed in a 2" straight-through extension tube with T2-2" connection
- Required element for safety and performance
- MUST be paired with Lunt H-Alpha Etalon for safe solar viewing!
Lunt B1800 Blocking Filter - 2" Extension Tube w/ T2 and 2" Connection Specifications...
Equipment Type: Solar Blocking Filter
Application: 2" Focusers
For Use With Focal Lengths: up to 1800mm (visual) - 1200mm (photographic)
Lunt Solar Systems Product Number: B1800s
Image depicts similar blocking filter system for illustratory purposes.