Information about sketch:
Sketch is of M20 – the Trifid Nebula
Done on the 23rd of September last year
Drawn completely at the eyepiece of a 12.5″ f6 dob using a 13mm T6 Nagler
for around 143x. It was done on white sketch pad paper using a graphite
pencil. The sketch was then scanned and converted to the negative in
Irfanview.
Cheers
Andrew Durick
Brisbane, Australia
The drawing with a 12.5″ scope shows that it was done in light-polluted skies.
In dark skies, the bluer reflection nebula completely surrounds the brighter emission nebula (the part with the X of dark lanes) and the emission nebula becomes clumpy with a lot more details.
This is a very good example of what an amateur can expect to see in average, somewhat light-polluted, skies with an 8-12″ scope.