to the Club Noticeboard!
The following items are for LOCAL sale only:
|Orion Hydrogen-Beta (H-Beta) Filter - 2"|
telescope filter may be the only way to see the faint and elusive Horsehead,
California, and Cocoon Nebulas. It blocks everything but the hydrogen-beta
light these faint nebulas emit, providing the contrast needed for viewing
By isolating the hydrogen-beta spectral line centered at 486.1 nm in a 12nm band-pass and blocking other wavelengths, Orion's Hydrogen-Beta Telescope Filter effectively blackens the background sky, allowing the faint nebula to become clearly defined. It increases contrast even under dark skies so you can visually capture these prized targets. Use with a moderate to large aperture telescope under clear, dark viewing conditions. Threaded to fit 2" telescope eyepieces and telescope diagonals.
For LOCAL sale only - £80. Contact: Robin Wilkey - Try before you buy offered!
Posted 11 March 2014
2" Filters For Sale:
Neutral Density Moon Filter - ND96-0.9 for 13% light transmission
Watcher Variable Polarising Moon Filter
Reduces glare whilst increasing contrast so perfect for observing bright objects such as the Moon or certain planets.
Light transmission can be varied from 40% down to as little as 1%.
Will not change
the colour of the object being viewed.
Watcher OIII Filter
The O-III narrow band-pass filter isolates just the two doubly ionized oxygen lines (496 and 501nm) emitted by diffuse, planetary and extremely faint nebulae.
O-III filters are best suited to telescopes of larger apertures and can produce near-photographic views of the Veil, Ring, Dumbbell, Orion and many other nebulae.
Effective under even heavily light-polluted skies!
For LOCAL sale only - £30. Contact: Robin
Wilkey - Try before you buy offered!