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I have found over the years that using a 640x480 sensor for imaging the Sun is not worth the trouble. You can still image at very hi resolutions with the DMK41. Or conversely you can use the lumenera skynyx 2-2. Each have large sensors which are perfect for this job. Frame rate speeds are slower but it is less important to have a high frame rate for capturing the Sun. Added to this you can do mosaics of the solar surface very quickly.
I have a Flea3 for planetary work where I need the speed. It is the usual story for astronomy, not one camera will do all the things you need it to do.
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