DEEP sky observation!

[victorpei]

Hey guys!

Just wondering if I wanna do some deep sky observation (i.e. Star Cluster, Nebulae etc) But I got some questions that wanna ask:
:help:What do I need? Some filters? What type of filter do I need?
:help:With the aid of the filter, is it possible to get the pretty colorful nebulae image?
:help:What the size of the eyepiece do U guys suggest? the small one or the large one?

Many many thanks!!!!:thumbsup:

[Glenhuon]

Hi Victor, :welcome: to IIS.
I'm no expert but here's my thoughts.

Filters. I have a quite a few coloured and some moon and polarizing filters, but can't remember when I last used them. Some of the more specialised ones, e.g. for nebula, can enhance the viewing I believe, but never used one so far.

Colours. I'm afraid not, your eyes are not sensitive enough in low light to pick them up. The images you see are taken with a camera, which has much greater sensitivity. Colours can be seen in bright objects like stars and planets, but not in nebula and other diffuse objects.

For clusters and nebula, generally a low to mid power eyepiece with a reasonably wide field of view. Useable magnification is subject to variation according to conditions (atmospheric transparency, light pollution etc.) From my light polluted backyard with the 10" Dob, a 25m or 15mm is what I use for these objects.

Cheers
Bill

[erick]

Re filters, here are a few threads you might read, Victor:-

http://www.iceinspace.com.au/forum/showthread.php?t=29302

http://www.iceinspace.com.au/forum/showthread.php?t=30147

http://www.iceinspace.com.au/forum/showthread.php?t=2109

http://www.iceinspace.com.au/forum/showthread.php?t=13827

http://www.iceinspace.com.au/forum/showthread.php?t=2450

http://www.iceinspace.com.au/forum/showthread.php?t=4545

http://www.iceinspace.com.au/forum/showthread.php?t=8700

Happy reading! :)