 |
|
|
|
|
3towers Observatory Images of Selected NGC, IC, and Other Interesting Objects |
|
|
 |
 |
|
NGC2158 Black & White |
NGC2158 Color |
These 3towers Observatory images were taken on a 12-inch LX 200
telescope using a focal reducer at f/6.5 with an
Apogee KX260
CCD camera or an Apogee AP7 CCD camera running under
MaxIm DL/CCD.
The black and white images vary from single 30 second exposures
to images produced by adding sixty one-minute exposures together
using a median routine in
Mira or
MaxIm DL/CCD.
The color images were taken with the Apogee AP7 CCD and an
ISIS FW1
Filter Wheel containing Red
(R), Green (V), Blue (B),
Infrared (I), and Clear Photometeric filters. The exposures vary
from R = 30 seconds, V = 30 seconds, B = 40 seconds for bright
objects to Red = five to ten 60sec exposures added together,
Green (V) = five to ten 60sec exposures added together, Blue =
eight to twenty 60sec exposures added together for fainter
objects. For very faint objects, even longer exposure sequences
were used for each color. For some objects, clear exposures were
also taken and added to the exposures through the photometric
filters to produce a final color image. In general, the only
image processing used is bias and dark subtraction, flat
fielding, and contrast stretching. Compare these images obtained
with a Meade 12-inch LX 200 telescope operating at approximately
f/6.5 with those from the Grasslands Observatory (24-inch f/5
telescope at a dark sky site). It is amazing what a relatively
modest sized telescope at a suburban location can achieve using
good imaging equipment and software.
|
|
All images are oriented with the North at the top and the West
to the right. |
|
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 | Back to top |
 |
|
