ZOOM SEQUENCE FOR XO-1
The following two iamges were made with a Canon 10D digital camera
mounted piggy-back to a Meade ETX-125EC telescope. I was inspired to
try this after seeing the superlative results of Paul Howell, who says
that he used a Canon 1Ds-Mark II digital camera and a 200 mm f/2.8 lens
stopped to f/5.6. His image is at PH.
Figure 1. Corona Borealis, FOV = 9.3 x 6.2 'arc. XO-1 is located between the bars, on the left. This image has been reduced to1/3 size of the original.
[Canon 10D, 135 mm, f/5.6, ISO 800, RAW images converted to 16-bit
TIFF; 12 30-second exposures, dark frame corrected; 2006.07.09,
Hereford Arizona Observatory]
Figure 2. Crop of original image.
Figure 3. Zoom factor 2, showing XO-1. Faintest stars
have V-mag ~14. FOV = 2.5 x 1.7 degrees. [Williams Optics Megrez 80,
f/6, Canon 10D; three 10-sec exposures; 2006.07.10]
Figure 4. Zoom factor 6. XO-1 is indicated by cross-hair
lines. Faintest stars have V-mag ~17. [Meade RCX400 14-inch, SBIG
ST-8XE CCD; 2006.04.19, Hereford Arizona Observatory]
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This site opened: July 9, 2006 . Last Update: July 10,