Messier 13, a globular cluster in the constellation Hercules as seen through a 3" Mini-Dobsonian

Messier 13, a globular cluster in the constellation Hercules as seen through a 3″ Mini-Dobsonian

Object Name: M13
Object Type: Globular Cluster
Location: Leioa (Bizkaia) – Spain
Date: 2014-07-30 / 23h 00m U.T.
Media: White paper, 4B, 2B y HB graphite pencil and difuminio, scanned and inverted with Photoshop
Telescope: Skywatcher Heritage 76/300mm (MiniDobson 3”)
Eyepiece: TS-HR 6mm + Lente Barlow (66X)
Transparency: Clear, City Skies.
Location Constellation: Hercules
Assessments: The cumulus appears as a fuzzy patch of gray, more or less circular, more blurred around the edges and more defined (bright) to the center, can not resolve stars.

For more details of my observation you can visit my blog:
http://juannava64.wordpress.com/2012/08/14/observacion-cumulo-globular-m13/

Thank you and best regards.