Hi All,

The four big nebulae that are M 8, 16, 17, and 20 are very often observed, often sketched, but not often compared, specialy concerning their colours through big apertures.
Here are what I've seen, with or without filters.

Detailed reports are hereunder:
M 8: http://www.deepsky-drawings.com/m-008-t508/dsdlang/en
M 16: http://www.deepsky-drawings.com/m-016-t635/dsdlang/en
M 17: http://www.deepsky-drawings.com/m-017-t635/dsdlang/en
M 20: http://www.deepsky-drawings.com/m-020/dsdlang/en

Clear skies
Bertrand
http://www.deepsky-drawings.com/dsdlang/en/


M 8 T508 BL 2012 06 24.jpg


M 16 T635 2018 07 09.jpg


M 17 T635 BL 2014 06 27.jpg


M 20 T635 BL 2017 07 11 .jpg