The calcium urchin limb

[Kitsunegari]

The spiked limb of solar calcium resembles that of a sea urchin!   A modest 127mm aperture with a 2.5x televue powermate.  A highspeed camera was used, at 250 frames per second.  The basler 720-520um IMX287 sensor is a game changer for timelapse imaging the sun.

[GreatAttractor]

Good to know about the required cadence for CaK time lapses. I've been very satisfied with my older Chameleon3 (up to 30 fps at full frame, perfectly fine for Hα and WL), but now I'm reconsidering getting a newer, faster CMOS model.

[Pete Presland]

Very nicely captured