Product Overview
The IDAS Hydrogen-Alpha family of filters allows astrophotographers to select an Hα filter optimally tailored to their equipment.
Features include:
- 6.8 nm bandpass (measured value 6.5 +/- 0.1 nm)
- 98% transmission (measured value)
- IR blocking out to 1200 nm
- 2.5mm and 3.0mm filter thickness options
- Configurations:
- 50.8mm for filter wheels (QHY/ZWO/Atik)
- 48mm and 52mm mounted
- Camera body drop-in (DI)
- Each filter is individually measured and inspected for quality
- 3 classes* available: STD, HS, UHS
- Made in Japan
The IDAS Ha-6.8 family includes 3 options - STD (Standard), HS (High Speed) and UHS (Ultra High Speed) with bandpasses adjusted to accommodate the f-ratio of different speed astrographs. In addition each class comes in two different glass thicknesses - 2.5 mm & 3.0 mm.
- STD - recommended for most regular scopes
- HS - ideal for the optics between F2.0 and F3.5 such as Takahashi Epsilon Series, RASA11, and standard camera lenses
- UHS - highly optimized for the optics for F2.2 or faster such as RASA8 and HyperStar Series
