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Hi John. Thanks very much for that tip - will follow it up and see if the same outcome is obtained with a filtered mono system. On the other side of the ledger, I have found that reducing the image scale at capture is advantageous in increasing the SNR (better stacking software performance) or allowing higher frame rates (reduced seeing smear), and it can also ease focusing problems on low level sources, such as the Saturn blue channel. Clearly need to look into this further, since there are many competing factors here. Regards Ray
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