Takahashi ε-130 on EM200 Temma 2
EOS450D Baader Mod w/ CLS Clip filter, ISO 800
Guided by DSI Pro2 via GPUSB on 8X50 Finder Scope
9x8min, darks, flats
Taken on 26 December 2010
DSS, PSCS
Image cropped and resized
Christmas Tree Cluster and Cone Nebula
Christmas Tree Cluster and Cone Nebula
Homework of my Boxing Day last shot.
Takahashi ε-130 on EM200 Temma 2
EOS450D Baader Mod w/ CLS Clip filter, ISO 800
Guided by DSI Pro2 via GPUSB on 8X50 Finder Scope
9x8min, darks, flats
Taken on 26 December 2010
DSS, PSCS
Image cropped and resized
Takahashi ε-130 on EM200 Temma 2
EOS450D Baader Mod w/ CLS Clip filter, ISO 800
Guided by DSI Pro2 via GPUSB on 8X50 Finder Scope
9x8min, darks, flats
Taken on 26 December 2010
DSS, PSCS
Image cropped and resized
![[Good Job]](./images/smilies/onion_d5f02ecd.gif "Good Job")
Thanks all.
My calculation for this image was - since it is a dim object, it needs extended time for each sub and so I ended up with 8 min. at f/3.3 to ensure enough photons are being collected. Next I found the CLS filter is very efficient in cutting off the sky background even in this exposure time (otherwise the gradient caused by light pollution is very difficult to tackle when stretched, even with LPS-P2) and more importantly it allows the red light form nebulae (to me even a bit too much off the balance!) to pass through and thus I guess the contrast should be enough. So this could have been my "formula" for dim red objects.
My 2 cents.
My calculation for this image was - since it is a dim object, it needs extended time for each sub and so I ended up with 8 min. at f/3.3 to ensure enough photons are being collected. Next I found the CLS filter is very efficient in cutting off the sky background even in this exposure time (otherwise the gradient caused by light pollution is very difficult to tackle when stretched, even with LPS-P2) and more importantly it allows the red light form nebulae (to me even a bit too much off the balance!) to pass through and thus I guess the contrast should be enough. So this could have been my "formula" for dim red objects.
My 2 cents.
誰在線上
正在瀏覽這個版面的使用者：沒有註冊會員 和 50 位訪客