Welcome
to TheRIM
CCD Pixel Size/arc-sec Spreadsheet
I have been working on a spread sheet to figure the
best imaging critria for my combination of Scope/Guide Scope and CCD
Cameras.
Using the Formula's at the bottom of the page I created a spread (CLICK HERE TO
DOWNLOAD) that take the optical information
about your Imaging Scope
(Scope 1) and your Guide Scope (Scope 2) then takes your Primary Camera
(Camera 1) and
Guide Camera (Camera 2) and figures the arc-sec per pixel
values at different optical configurations. Using my scopes and
camera
as the basis, A LX200 10" @ f/10 and a 4" f/10
guidescope, Genesis with 9 micron pixels and a B&W Quickcam
Guider (TC255) with
10 Micron Pixels. I figure combinations for
Binning from 1 x 1 to 3 x 3, at f/ratio's of f/10, f/6.3, f/3.3, a user
defined f/ratio (4.3) and with
a 2x barlow. then based on the seeing
conditions you can pick the best configuration for your equipment to guide
and image with.
This all assumes my math and understanding
are correct so if anyone see's anything wrong please feel free to contact
me and let me know
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CCD Pixel Size Spreadheet |
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For pixel matching and Guidescope Calcualtions |
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Camera 1: |
Genesis |
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Scope
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LX200 10" SCT |
R/C |
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Pixel Size: |
0.009 |
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FL: |
2540 |
Dia: |
254 |
4.3 |
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Camera 2: |
B&W QC |
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Scope
2: |
Guide Scope |
Barlow |
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Pixel Size: |
0.010 |
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FL: |
1000 |
Dia: |
100 |
2 |
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LX200
10" SCT |
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Using a |
Genesis |
Camera |
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F Ratio |
Binning |
Focal Length |
Pixel Size |
arc-sec |
Notes |
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Per Pixel |
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Stanard |
f/10.0 |
1 x 1 |
2540.0 |
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0.009 |
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0.73 |
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6.3 R/C |
f/6.3 |
1 x 1 |
1600.2 |
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0.009 |
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1.16 |
4 |
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3.3 R/C |
f/3.3 |
1 x 1 |
838.2 |
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0.009 |
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2.21 |
1,6 |
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User F/R |
f/4.3 |
1 x 1 |
1092.2 |
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0.009 |
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1.70 |
5 |
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Barlow |
f/20.0 |
1 x 1 |
5080.0 |
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0.009 |
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0.36 |
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Stanard |
f/10.0 |
2 x 2 |
2540.0 |
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0.018 |
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1.46 |
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6.3 R/C |
f/6.3 |
2 x 2 |
1600.2 |
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0.018 |
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2.32 |
2,7 |
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3.3 R/C |
f/3.3 |
2 x 2 |
838.2 |
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0.018 |
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4.42 |
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User F/R |
f/4.3 |
2 x 2 |
1092.2 |
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0.018 |
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3.39 |
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Barlow |
f/20.0 |
2 x 2 |
5080.0 |
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0.018 |
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0.73 |
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Stanard |
f/10.0 |
3 x 3 |
2540.0 |
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0.027 |
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2.19 |
3,8 |
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6.3 R/C |
f/6.3 |
3 x 3 |
1600.2 |
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0.027 |
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3.47 |
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3.3 R/C |
f/3.3 |
3 x 3 |
838.2 |
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0.027 |
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6.63 |
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User F/R |
f/4.3 |
3 x 3 |
1092.2 |
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0.027 |
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5.09 |
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Barlow |
f/20.0 |
3 x 3 |
5080.0 |
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0.027 |
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1.09 |
9 |
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Guide Scope |
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Using a |
B&W QC |
Camera |
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F Ratio |
Binning |
Focal Length |
Pixel Size |
arc-sec |
Notes |
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Per Pixel |
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Stanard |
f/10.0 |
1 x 1 |
1000.0 |
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0.010 |
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2.06 |
1,2,3 |
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6.3 R/C |
f/6.3 |
1 x 1 |
630.0 |
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0.010 |
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3.27 |
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3.3 R/C |
f/3.3 |
1 x 1 |
330.0 |
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0.010 |
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6.24 |
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User F/R |
f/4.3 |
1 x 1 |
430.0 |
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0.010 |
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4.79 |
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Barlow |
f/20.0 |
1 x 1 |
2000.0 |
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0.010 |
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1.03 |
4,5,6,7,8,9 |
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Stanard |
f/10.0 |
2 x 2 |
1000.0 |
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0.020 |
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4.12 |
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6.3 R/C |
f/6.3 |
2 x 2 |
630.0 |
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0.020 |
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6.54 |
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3.3 R/C |
f/3.3 |
2 x 2 |
330.0 |
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0.020 |
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12.48 |
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User F/R |
f/4.3 |
2 x 2 |
430.0 |
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0.020 |
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9.58 |
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Barlow |
f/20.0 |
2 x 2 |
2000.0 |
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0.020 |
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2.06 |
1,2.3 |
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Stanard |
f/10.0 |
3 x 3 |
1000.0 |
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0.030 |
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6.18 |
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6.3 R/C |
f/6.3 |
3 x 3 |
630.0 |
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0.030 |
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9.81 |
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3.3 R/C |
f/3.3 |
3 x 3 |
330.0 |
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0.030 |
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18.72 |
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User F/R |
f/4.3 |
3 x 3 |
430.0 |
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0.030 |
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14.37 |
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Barlow |
f/20.0 |
3 x 3 |
2000.0 |
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0.030 |
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3.09 |
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© 2001
William D. Carroll |
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To find the pixel size
given the arc-sec per pixel and the focal length |
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To find the focal length
given the pixel size and arc-sec per pixel |
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To find the arc-sec per
pixel given the pixel size and focal length |
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Send comments and suggests to voxr@home.com
This site has been seen 
time since April 18, 2001 |
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