Re: [APML] Orion panorama

From: Wei-Hao Wang

To: APML

Sent: Wednesday, January 12, 2005 7:52 AM

Subject: [APML] Orion panorama

ALOHA,

Please allow me to call this a panorama, although it doesn't cover the
entire Orion.
I went to Mauna Kea last month and it may be my last time taking astro pictures
in recent 2 or 3 years. This image is the primary effort of mine
since Dec 2003.
Here we go:
http://www.ifa.hawaii.edu/~wang/misc/orion_01x.jpg

What you see is a 0.1x reduction of the original image. I'm still
finalizing the image
processing. Later (next month?) I will post a full webpage for this
image, including
all byproduct images. At this moment, any comments are welcome. Below are
more details about the imaging and processing.

Images were taken between Dec 2003 and Dec 2004, in a total of 9 nights.
Telescope is Pentax 105SDHF with focal reducer (F5.1). Camera is Pentax 67.
Film is Kodak E100S pushed 1. Exposure time is 90 minutes. The final picture
contains 22 of such images. 18 of them form a 3x6 mosiac. 4 of them are added
onto selected regions to increase S/N.

As before, the individual images were flattened in my own program, registered
and calibrated in Registar, and combined in Photohop. There is a
short exposure for
M42 very slightly blended into this image. I prefer to keep M42
bright and almost
saturated. I tried not to over-process the nebulas although the depth
of this image
does allow a strong enhancement. The time I spent on image processing
is perhaps
2x the total exposure time. Later I will tell you more details about
the technique
of image processing.

Comments are welcome.

Wei-Hao

--
________________________________________________________________
Wei-Hao Wang :)

Institute for Astronomy at University of Hawaii

Address:
2680 Woodlawn Drive         Personal Website:
Honolulu, HI 96822             http://www.ifa.hawaii.edu/~wang
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