Drawing of M 101



Field: 51' x 35'
Location: rural
Instrument: refractor
Aperture: 68 mm (2.5 inch)
Focal length: 900 mm (35 inch, 1/13)
Eye-piece: 17 mm
Magnification: 53x
FoV: 57'
EP: 1.3 mm

Comparison with Foto



Red: photo
Blue: drawing

The spiral arms fit very well!