Daystar ATM H-Alpha 0.7A Solar Filter (Pre-owned)

ATM-series filtering systems offer impressive visual and imaging performance at an accessible price, even though they may not have the same level of spectral uniformity found in higher-end designs. These instrument-grade etalons provide smooth spectral behavior that meets the needs of most observers, and with minor darkroom adjustments, they can produce highly informative filtergrams. Designed to operate optimally at f/32—whether at full aperture or stopped down—and compatible with optical systems up to 2000mm effective focal length, these filters deliver strikingly consistent results. The ATM series features a cylindrical, temperature-regulated oven for precise thermal tuning during use. Each unit is factory-calibrated to maintain accurate bandpass alignment, and users continue to be impressed by the quality of the views and images these systems provide.