Astronomik Pro Planet 742, blue half of the spectrum, mosaiced from still frames of a video captured through a spectroheliograph while rotating the grating. The red half was fairly dark, till the sensor got saturated at around 750nm, which is the mechanical limit of the Sol'Ex. Raw recording, no calibration, constant exposure time.

Enclosure with incandescent light source, tunnel, filter slider, the detector's optical fiber. Noisy on the UV and IR extremes. 2025-02-12