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CCD Used Number of
Camera
Tracking
TC-211
CCD
ST-5C
TC-255
ST-237A
TC-237
STV
TC-237
ST-6
TC-241
ST-7E
KAF0401E 765 x 510
ST-8E
KAF1602E 1530 x 1020
ST-9E
KAF0261E 512 x 512
ST-10E
KAF3200E 2184 x 1472
ST-1001E KAF1001E 1024 x 1024
How these various specifications affect the average user is described in the following
paragraphs:
Number of Pixels - The number of pixels in the CCD affects the resolution of the final images.
The highest resolution device is best but it does not come without cost. Larger
CCDs cost more money and drive the system costs up. They are harder to cool,
require more memory to store images, take longer to readout, etc. With typical
PC and Macintosh computer graphics resolutions, the CCDs used in the SBIG
cameras offer a good trade off between cost and resolution, matching the
computer's capabilities well.
Pixel Dimensions - The size of the individual pixels themselves really plays into the user's
selection of the system focal length. Smaller pixels and smaller CCDs require
shorter focal length telescopes to give the same field of view that larger CCDs
have with longer focal length telescopes. Smaller pixels can give images with
higher spatial resolution up to a point. When the pixel dimensions (in
arcseconds of field of view) get smaller than roughly half the seeing, decreasing
the pixel size is essentially throwing away resolution. Another aspect of small
pixels is that they have smaller full well capacities.
or entire CCD sensor you can use the following formula:
where size is the pixel dimension or CCD dimension in millimeters and the focal
5
The Kodak CCDs (KAF0400 and KAF1600) are available with or without Antiblooming Protection.
Units with the Antiblooming Protection have one-half the full well capacity of the units without it.
Section 4 - Camera Hardware
Pixel
Pixels
Dims.
192 x 164
13.75 x 16 µ
320 x 240
10 x 10 µ
657 x 495
7.4 x 7.4 µ
320 x 200
14.8 x 14.8 µ
375 x 242
23 x 27 µ
9 x 9 µ
9 x 9 µ
20 x 20 µ
6.8 x 6.8 µ
24 x 24 µ
Table 4.3- CCD Differences
For your reference, if you want to determine the field of view for a pixel
Field of view (arcseconds) =
Field of view (arcseconds) =
Array
Dimension
2.6 x 2.6mm
3.2 x 2.4mm
4.7 x 3.6mm
4.7 x 3.0mm
8.8 x 6.6mm
6.9 x 4.6mm
13.8 x 9.2mm
10.2 x 10.2mm 13e- rms 180Ke-
14.9 x 10.0mm 11e- rms 77Ke-
24.6 x 24.6 mm 16e- rms 180Ke-
8.12x size (µm)
focal length (inches)
20.6x size(um)
focal length (cm)
Page 28
Read
Full Well
Noise
Capacity
-
-
12e
rms 150Ke
-
-
20e
rms 50Ke
-
-
15e
rms 20Ke
-
rms 20Ke-
17e
-
-
30e
rms 400Ke
15e- rms 50Ke
-
/100Ke
15e- rms 50Ke
-
/100Ke
-
5
-
4
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