Example of correct focusing of optics attached to a camera. The publication includes additional helpful information such as: Basic facts about Vega (Alpha Lyrae), The significance of Vega, Why Vega is ideal for focusing, The operating principle of the Bahtinov mask, How to identify ideal focus.
M92 is a globular cluster of stars in the northern constellation of Hercules. M92 is at a distance of about 26,700 light-years away from Earth.
It is a stretch of galaxies that forms part of the Virgo Cluster. When viewed from Earth, the galaxies lie along a smoothly curved line. Member galaxies include M84 (NGC 4374), M86 (NGC 4406), NGC 4477, NGC 4473, NGC 4461, NGC 4458, NGC 4438 and NGC 4435.
M71 (NGC 6838) is a globular cluster in the constellation Sagitta. The star cluster is at a distance of about 12,000 light years away from Earth and spans some 27 light years across.
Same Light frames (made 30.3.2019) has been processed but with new technique.
M13 – Cluster of Hercules – Brightness is 5.8 Magnitude. The cluster’s diameter is 145 light years! The distance from the ground is 25.1 thousand light years.
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