Daystar Filters' Quantum H-Alpha Bandpass Filter SE (0.7-0.9Å, Standard Grade) incorporates many of the desired features for today's solar astronomer. Just plug it in and a green light indicates when the filter is on band. The housing has an LCD readout of the filter's wavelength output (accurate to 0.1Å) and red/blue wing shift buttons that can precisely tune wavelength up or down for Doppler studies. The unit operates at 12 VDC for field or battery use. Included is a 100-240V power supply with US, European, UK, and Australian adapter wall plates and a serial port for computer control capability for on-screen display of filter readouts.
Quantum SE-grade series filters are designed for amateur and academic applications. These filters meet the critical DayStar quality control criteria applicable in all visual and some photographic environments.