Hi All,
Thanks Howard and Peter for your answer.
Actually, my question to know if there were some post about the Pleiades was not for a question of drawing, but a question of color, depending on how big the scope is.
Here is the matter*:
When I observe M 45 with a rather small scope, and a DS Lumicon filter, all the nebulosities are seen with a weak blue light, the color of which is the wellknown blue of reflection nebulae.
http://www.deepsky-drawings.com/m-045-l80/dsdlang/fr
But when I observe the field with a large scope, the colors are different*: without filter, stars and nebulosities, all of them, are white, or rather show no color.
But with the DS filter, all nebulosities are light blue, the same blue as previously described (scaled C 130 / 135 in color scale of Photoshop or Paintshop Pro, or any other file), EXCEPT Merope nebula.
Merope nebula is obviouly not blue, but a kind of dirty white, more or less brownish (that I scaled C 15 / 20)
http://www.deepsky-drawings.com/m-045-t635/dsdlang/fr
I've never heard about this difference of color in Pleiades' nebulosities, and it is why I asked my question, and waited for your observation reports.
What do you think about that*? Is it possible that there is a part of H alpha in the light of Merope nebula*?
Clear skies
Bertrand
http://www.deepsky-drawings.com