A WINNER IN WINTER
The Sodium D-Line Quark is a really good piece of kit for any solar astronomer. The ability to image straight through poor seeing with a low Sun in winter is quite an achievement, as all too often it’s not worth setting up your equipment. Having a clear 20mm aperture filter allows the use of the latest large sensor cameras with no distortion to the image.
The filter allows for high-speed imaging due to its brightness compared to the calcium and hydrogenalpha Quarks, which is useful for making the most of gaps in the cloud to grab images quickly.
On a large aperture telescope with good seeing in the summer it should be possible to make some nice time lapse videos of sunspots and granulation movement. The eyepiece holder can be removed and replaced with an interference eliminator for higher quality images.
This sunspot was imaged using the Sodium Quark – it’s a stack of the 250 best frames from a capture run of 1,000