Sun Spot AR2736 Near The Limb

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Sun Spot AR2736 near the limb
Taken by jean-pierre brahic on March 23, 2019 @ Uzès ( France)

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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: 2019:03:23 20:24:29

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Details:

AR2736 Gets closer to the limb . Réfractor H-Alpha 230mm F/D 9 Baader TZ4x Filter H-Alpha 0.3A° Caméra Basler ACA1920-155 ( 165fps)

Photographer's website:

http://https://www.astrobin.com/users/jp-brahic/

Comments

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very nice image, but it is sad to notice the $20,000 solar filter you are using still contains the parasitic double limb with such a tight low angstrom bandwidth. Etalon companies should alter the finesse of their products to account for that offband bleed :( , it is so easy to fix, but it is not a concern for them!

Posted by amplelight 2019-03-24 14:19:36

thank you , its not the double limb!! its just the limb which is darker because of the gamma used

Posted by jp-brahic 2019-03-25 01:24:06

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