Hi, (especially to Weixing)
This is 15 x 60s of Sculptor Galaxy with modified 350D with R200SS and coma corrector 2. This is cropped because the full image contains very complex differential gradient due to high clouds yesterday. The coma in R200SS is totally acceptable with the small sensor of 350D.
http://www.singastro.org/album_showpage.php?pic_id=899
The problem with f4 is that saturation is too easy in our skies and with high clouds yesterday. Can't really judge the right subexposure yesterday.
Guiding with Lumenera is a joy. I never searched for guide stars. I always see many stars to choose from.
Sculptor (DSLR version)
By the way, what ISO did you use?? 
"The universe is composed mainly of hydrogen and ignorance." Hi, Since yesterday I am testing the setup, I concentrate on capturing light frames. The ISO is 100 to avoid dark frames. No flat and no bias frames are taken.
Sigh, still scratching my head on how to determine max subexposure since the debayered JPG image does not really tell the histogram of the RAW image. And if you debayer the RAW image under the stars to check the histogram, its a waste of time!!!
Sigh, still scratching my head on how to determine max subexposure since the debayered JPG image does not really tell the histogram of the RAW image. And if you debayer the RAW image under the stars to check the histogram, its a waste of time!!!
This cropped pic is 1432 x 900
The original pic is 3360 x 2218
Yah, that's why R200SS and VC 200L are scopes that I will keep for DSO imaging. The EQ-6 is really a wonderful platform. I did not do drift alignment. When wind blows EQ-6 has no vibrations. And GOTO puts the object in the field, the use ImagesPlus focus mode to centre and focus and can start opening the shutter!
The original pic is 3360 x 2218
Yah, that's why R200SS and VC 200L are scopes that I will keep for DSO imaging. The EQ-6 is really a wonderful platform. I did not do drift alignment. When wind blows EQ-6 has no vibrations. And GOTO puts the object in the field, the use ImagesPlus focus mode to centre and focus and can start opening the shutter!
You used Imageplus to focus, so you have a focusing motor as well?Meng Lee wrote:This cropped pic is 1432 x 900
The original pic is 3360 x 2218
Yah, that's why R200SS and VC 200L are scopes that I will keep for DSO imaging. The EQ-6 is really a wonderful platform. I did not do drift alignment. When wind blows EQ-6 has no vibrations. And GOTO puts the object in the field, the use ImagesPlus focus mode to centre and focus and can start opening the shutter!
Wee Nghee the Pooh
wow nice image
wow, wonderful image taken with 350D. i will try to take but not at this moment due to no exp...at all...so i dn't hope at least for now. wating for some arrangement and learn some tricks about astrophotography.
nice pic....
michael
nice pic....
michael
Hi ML,
Good attempt on the image. Was wondering if u see a dust mote on the top left, perhaps it could be removed using some flat frames. U could check this under Threshold in PS and move the slider to the left. There was some residual background gradients moving from reddish hues to greenish from left to right, again, it can be easily fixated by Croman's tool. Run through using fine mode. If still cannot, run through twice, it should be fine. You might like to run the data through LR decon process possibly with <3 iterations to tighten up the stars to compensate for turbulent seeing conditions.
Good attempt on the image. Was wondering if u see a dust mote on the top left, perhaps it could be removed using some flat frames. U could check this under Threshold in PS and move the slider to the left. There was some residual background gradients moving from reddish hues to greenish from left to right, again, it can be easily fixated by Croman's tool. Run through using fine mode. If still cannot, run through twice, it should be fine. You might like to run the data through LR decon process possibly with <3 iterations to tighten up the stars to compensate for turbulent seeing conditions.