Orion wide-field w/ Canon 28-300mm L

beautiful! Wow!

Very nice images. Love the detail and colors. If only we could stuff like that with our own eyes....

Al

hey man, amazin shot once again! ...fancy sharin ur Camera settings? iso, f ?

Taken from the first picture:

Total exposure: 4hr 36min (80 x 15-sec + 80 x 30-sec + 76 x 1-min + 70 x 2-min)
Canon 40D + Canon 28-300mm L @ 300mm, f/8, ISO1600
Sirius EQ-G mount
Captured using ImagesPlus Camera Control, stacked in DSS, processed in Photoshop CS3

Hulka wrote in post #11514140
Taken from the first picture:

Total exposure: 4hr 36min (80 x 15-sec + 80 x 30-sec + 76 x 1-min + 70 x 2-min)
Canon 40D + Canon 28-300mm L @ 300mm, f/8, ISO1600
Sirius EQ-G mount
Captured using ImagesPlus Camera Control, stacked in DSS, processed in Photoshop CS3

When using multiple exposures such as that, are you stacking them separately into individual images for each exposure, or together into a single image that is stacked from all the combined (averaged) exposures?

If you stacked them all into a single image the total exposure will be an average of the total sum. instead of 4hrs 36mn, it averages out closer to 1hrs 9mn.
I can understand taking different exposures if your stack them separately to later combine into a HDR type image. E.g. to combine the trapizium into the nebulosity so it's not blown out.