4042 x 3392 px | 34,2 x 28,7 cm | 13,5 x 11,3 inches | 300dpi
Data acquisizione:
14 ottobre 2023
Altre informazioni:
This is a composite of the October 14, 2023 annular solar eclipse at second contact. It illustrates the irregular edge of the Moon breaking up the rim of sunlight as the dark disk of the Moon became tangent to the inner edge of the Sun at second contact at the start of annularity. This is a blend of fifteen exposures taken over 20 seconds at second contact. They are layered with a Lighten blend mode and offset a few pixels, so the last image in the sequence is at top and the firsr with the most beading at bottom. The blending of contact images all slightly offset like this has the effect of "drawing out" an elongated version of the profile of the lunar limb, exaggerating the rough edge from lunar mountain peaks. So these are "reverse Baily's Beads, " in contrast to those that appear at a total eclipse which are bright beads of light. The rest of the lunar limb is also marked by a roughness from craters and mountains in profile. The camera was on the telescope oriented to place celestial north up in the frame. The second contact images are selected from a set of 344 taken using the Canon R5's High Speed Continuous+ frame rate for stills (these are not from movie frames) which shot 20 raw frames per second. I selected every 24th frame in the set, so they are about equally spaced in time. The blending of offset images does result in slightly oblate solar and lunar disks. All are 1/400 second exposures at ISO 100 and through the Astro-Physics Traveler 105mm refractor with a 2X Barlow lens for an effective focal length of 1200mm and at f/12. The filter was the Kendrick/Baader Solar Film filter, with the solar disk colourized a pale yellow in processing. The site was Ruby's Inn Overlook at Bryce Canyon City, Utah, a site well south of the eclipse centreline. A high-speed set taken at third contact failed to record due to an Error70 communication error, a known but intermittent bug in Canon firmware when a camera is attached to a non-Canon lens it cannot communica
