Pleiades or Seven Sisters (M45) Open Star Cluster

wucheeyiun · Post by **wucheeyiun** » Thu Feb 10, 2011 4:26 pm

Apart from the open star cluster...i like the faint nebulae sprawling across ... great work weixing

Post by **weixing** » Thu Feb 10, 2011 4:35 pm

Hi,

Enterprise wrote:Hi weixing nice capture! Spikes look abit weird to me but to each his own i guess!

Each 2 min exposure in post editing you had to process for field rotation in each frame?

The software will align the stars during post processing as long as there is no star trails on each frame.... actually, there are "star trails" on many frames which is cause by the strong wind... I super "bo chap" and stack them all... hee hee :-P

wucheeyiun wrote:Apart from the open star cluster...i like the faint nebulae sprawling across ... great work weixing

Thanks... I think it'll be better if I shoot at wide open. Anyway, will want to test with LPS filter on... but just wonder when the next clear night will come??

Have a nice day.

kensou · Post by **kensou** » Thu Feb 10, 2011 5:15 pm

so basically you took all unguided??

after each take adjust den take again?

Post by **weixing** » Thu Feb 10, 2011 6:07 pm

Hi,

kensou wrote:so basically you took all unguided??

Yes... all unguided... that's why all are "short" exposure (consider short in astrophotography).

kensou wrote:after each take adjust den take again?

Usually no adjustment during the shoot... I usually took all shots at one go and do alignment of the image during post processing. Of course, your polar alignment must be accurate enough that the whole object must still be inside the frame at the last shot.

Have a nice day.

Post by **Airconvent** » Thu Feb 10, 2011 9:52 pm

Well done , Mr Yang! Its really beautifully taken ! I like that its so sharp and clear with a tinge of nebulosity [smilie=crying2.gif]

Maybe Subaru can use it for their adverts and pay you for it! "Astronomical COE Prices!"

kensou · Post by **kensou** » Thu Feb 10, 2011 11:32 pm

o.O within 2 hours ur subject did not move out of ur camera shot? that pro? wow lol

orly_andico · Post by **orly_andico** » Fri Feb 11, 2011 12:02 am

unguided means that an autoguider was not used.

the telescope was still tracking at sidereal rate.

right now i'm only up to 30 seconds (on my Z70ED - 336mm FL). i tried 30 seconds @ 720mm and got oblong stars.

need to work on my latitude adjustment! (the polar alignment is pretty good already).

timatworksg · Post by **timatworksg** » Fri Feb 11, 2011 9:19 pm

@kensou

You can if you perform drift alignment apart from roughly aligning to the pole! Drift alignment may seem daunting but once you've done it a few times, you can probably drift align very quickly! Drift alignment fully ensures your mounts sidereel tracking is always keeping the target where you want it in the EP for as long as you want!
Basically it's centering the RA axis as close to celestial Pole as possible, which is where we really want our RA axis to point to especially for AstroImaging!