II f/4.1; Location:
Del Mar CA; 14 Mar. 2005; Camera: ToUcam SC3
Exposure: 20 x 30 sec with Orion Skyglo and Baader IR Block Filter
and 20 x 20 sec / 20 x 8 sec with Baader IR Block Filter for Luminance exposures;
15 x 20 sec R,G,B exposures.
Processing: All exposures captured in K3CCDTools 2. Alignment and stacking was done with Registax
3 and saved as FITs. LRGB channels were co-registered in IRIS. Luminance and Color channels were scaled and rough color balanced in
IRIS. The luminance exposures was constructed with the with the 20 sec
exposure as the base exposure; the 36 sec luminance skyglo filtered exposure was
combined to reduce star size on the brighter stars. The 8 sec exposure was
not used. LRGB channels were resized to 800x600. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB). Color
balancing and final touches were done in Photoshop. SGBNR (PixInsight LE) was used to smooth background noise on the
final result. final image size is approximately 800x600.
This image was an unguided exposure. NGC 1807 the smaller cluster in the lower
right of this image consisting of a loose group of bright stars. NGC 1817 is the
larger more rich cluster of stars in the upper left. Horizontal FOV is about 50'.
Image center is at Equatorial 2000: RA: 05h 11m 37s Dec: +16°36'21"