Details
Description
In good used condition
The Custom Scientific H-Alpha 656.3/4.5
nanometer filter is a great accessory for imaging emission nebulae
which emit large amounts of the H-Alpha spectral line at a 4.5 nanometer
bandpass due to excited hydrogen atoms. This helps enhance the
visibility of hot gas being excited by the electrons giving off excess
energy of photos due to close luminous hot stars being born nearby.
Since this is a 4.5 nanometer bandpass, it is highly recommended that
this filter be used with telescopes that have slower focal ratios to
achieve maximum efficiency. This filter is available in 1.25" round
mounted, 50mm round unmounted, and 50mm square formats.
- H-Alpha filter wavelength
- Excellent for slower focal ratio telescopes
- Works well with emission nebulae or planetary nebulae with excited hydrogen atoms