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misunderstanding concerning CCDs
There's something I think I have wrong concerning CCDs and I wanted to find
out the correct answers. Say I have a webcam, which has an ICX098 CCD and another camera with an ICX424 CCD. I want to image Jupiter with a C8 and 3x barlow ahead of the webcam and other camera. When the webcam/ barlow/ C8 combo are used, let's say that the diameter of Jupiter on the laptop screen is 3" across. Now, I remove the webcam and replace with the camera with the ICX424 CCD, making sure the CCD is the same distance as the webcam's. What will the image size be on the screen now? The part I'm finding confusing is this: since the ICX424 covers a larger pixel area than the 098 and also has a larger pixel size(?), I am assuming the amplified Jupiter will not be the same size on the screen that the laptop produces. Am I wrong? Or is it that the 424 just covers a wider area and the image size of Jupiter is still the same? Finally, what benefit, if any, would there be with this combo system if using just the 424? Would there be better resolution than the 098 offers or worse? I know, lots of questions here, but would like to end my confusion once and for all! Thanks, John Edmund |
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Hi John,
laptop produces. Am I wrong? Or is it that the 424 just covers a wider area and the image size of Jupiter is still the same? Assuming you ar looking at images from both at 100%, more pixels will just give a wider area on screen. Larger pixels will result in the image being smaller as the size of pixels on the screen is constant. But larger pixels means the object will cover less pixels, resulting in a smaller image onscreen. Regards Eddie T. http://astroshed.com "John Edmund" wrote in message link.net... There's something I think I have wrong concerning CCDs and I wanted to find out the correct answers. Say I have a webcam, which has an ICX098 CCD and another camera with an ICX424 CCD. I want to image Jupiter with a C8 and 3x barlow ahead of the webcam and other camera. When the webcam/ barlow/ C8 combo are used, let's say that the diameter of Jupiter on the laptop screen is 3" across. Now, I remove the webcam and replace with the camera with the ICX424 CCD, making sure the CCD is the same distance as the webcam's. What will the image size be on the screen now? The part I'm finding confusing is this: since the ICX424 covers a larger pixel area than the 098 and also has a larger pixel size(?), I am assuming the amplified Jupiter will not be the same size on the screen that the laptop produces. Am I wrong? Or is it that the 424 just covers a wider area and the image size of Jupiter is still the same? Finally, what benefit, if any, would there be with this combo system if using just the 424? Would there be better resolution than the 098 offers or worse? I know, lots of questions here, but would like to end my confusion once and for all! Thanks, John Edmund |
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