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Alexander, I would suggest the webcam over the DSI especially with a 10"f6. Reason being that the webcam has smaller pixels and therefore better resolution for deepsky objects. The extra sensitivity of the DSI is offset by the larger rectangular pixels.
Typical Webcam resolution with 10"f6 += 0.8arcsec/pixel
resolution of DSI with 10"f6 = 1.17 arcsec/pixel
Webcam will out perform the DSI
Doug
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