Thread: Canon L lens vs Refractor for astrophotography?
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Old 08-10-2008, 03:58 PM
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bojan
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It is easy to calculate FOV for given focal length and sensor size..
For example, 300mm on Canon 400D has 254x170 arc minutes field of view..
Enter those values into CdC Eyepiece/CCD field and voila.. you will see exactly what will be on your image.
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