[APML] Center of Orion

[Wei-Hao Wang <wang@ifa.hawaii.edu>]

Hi All,

I processed the central two frames of the Orion mosaic and uploaded to 
my website:
http://www.ifa.hawaii.edu/~wang/gallery/picutres/orion-center-2004.htm
I added several old images of M42 to avoid the saturation but I didn't
apply strong masks.  You can see an "enhanced" version for fainter
nebulas by moving the cursor on the image.

I decide not to further process other frames until I collect more of
them and upgrade my computer.  My computer even have difficulty to 
handle two frames with full resolution in 16bit mode.  If you like to 
see what I already have, a preview is here:
http://www.ifa.hawaii.edu/~wang/misc/orion-mosaic.jpg 

One thing interesting I found about this image (the two frame version) 
is that the stars appear much larger, comparing to my other pictures 
taken with Provia 400F or Centuria 400.  For example:
http://www.ifa.hawaii.edu/~wang/gallery/picutres/m16_to_24.htm
When I zoomed in, I found the faintest stars in both images have similar 
diameters, about 30 um to 40um.  But brighter stars by E100S appear 
fatter.  I guess this has something to do with the much smaller dynamical 
range of the pushed slide, i.e, stars grow and get saturated much faster.
Another possible reason is the hilation in the film.  If you zoom in the
E100S image, you see halos around stars.  This is not the case on Provia
400F or Centuria 400. 

Comments are welcome.
Have a nice weekend.

Wei-Hao

______________________________________________________________________
Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

Address:                       Phone: 808-956-9867                  
2680 Woodlawn Drive            Personal Website:
Honolulu, HI 96822             http://www.ifa.hawaii.edu/~wang
______________________________________________________________________



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