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the user needn't worry about configurations
5Å PE Hydrogen Alpha
Best performance with F/7 - F/30 refractors full aperture
Orion Sirius
Switch from Hydrogen Alpha proms to surface detail
Daystar 2" UV/IR Filter - DSIUV2 Telescope Controllers_SkyBT the user needn't worry aboutUV IR Cut Filter Blocks all other parts of the spectrum in the UV and IR. The Astronomik UV IR Blocker is the ideal choice as a luminance filter for any kind of digital photography. Because of the perfect blocking of UV and IR, all optical problems in these parts of the spectrum are avoided. It blocks the heat from reaching your filter and diagonal as well. The filter is optimized for systems with focal ratios between f 0. 5 and f 50. The typical