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misunderstanding concerning CCDs: correction, sorry!
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 webcam produces and will in fact be smaller with the 424 camera in place. 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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"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 webcam produces and will in fact be smaller with the 424 camera in place. 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! Hi John, Since both CCDs have the same number of pixels (640x480) the image of Jupiter on the 424 chipped camera will appear smaller by 5.6/7.4 (The relative size of the pixels in microns) ie it will cover fewer pixels and each pixel will cover a bigger area. This means you will lose resolution unless you increase magnification. (You would then be back to where you were with the 098 chip in terms of resolution and field of view.) HTH Robin -------------------------------------------------------------------------- Robin Leadbeater 54.75N 3.24W http://www.leadbeaterhome.fsnet.co.uk/astro.htm ---------------------------------------------------------------------------- - |
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