Venus sketch 14/02/09
Posted 15 February 2009 - 06:28 AM
i also tried a light blue filter + variable polarizing filter, but i felt the red filter was better for bringing out more contrast.
(while i was looking at a bright yellow venus against an orange background, i prefer using more of a skyblue background for the sketch even though i could see nothing without the filters!)
Posted 15 February 2009 - 11:09 AM
This is an excellent sketch of the albedo features on Venus. Thanks for posting it.
Posted 15 February 2009 - 11:24 AM
An excellent observation of Venus showing the faint Venusian albedo features. The use of filters (Wratten 23A or 25 (light red to red) or W38A (blue)) can help bring out these elusive albedo features. Sol also showed that the new Burgess Optical Contrast Enhancing Diagonal (CED) can also bring out features over Venus. Thank you for sharing them with us all.
Posted 15 February 2009 - 01:11 PM
Posted 15 February 2009 - 03:14 PM
Posted 15 February 2009 - 03:20 PM
Posted 15 February 2009 - 04:18 PM
Wonderful work from Belgian soil!
I also enjoyed the clear sky of last night.
Posted 16 February 2009 - 12:01 AM
Wonderful sketch. I have never observed Venus with the use of filters. Perhaps I am missing this in my 10.1" f/4.5 Dobsonian. You along with others here have inspired me to take a look now.
Thank you for sharing this,
Posted 17 February 2009 - 01:35 PM
Rony: your sketches become frightening more realistic every time & the accompagnying reports are always fun to read!
Eric: i'm a little less around now, but i'm sure i'll begin posting a lot of mars sketches by the end of 2009 i hope to start by september...
Mark: i definitely think not using filters is the cause of you not seeing details on venus. i use 8" and the unfiltered view is waaaay to bright, so i can only assume your 10.1" will only be brighter. as Sol says: Venus can take a big cut in light. my variable filter was on the darkest setting for the sketch!