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Duncan, I see that you said you don't use the nosepiece anyway. You seem to be saying you have removed it from the QHY8. I take it that you screw the MPCC spacer straight into the body of the QHY8 and the MPCC into the other end. Is that right? If it is, it probably means you are not achieving the 55mm separation the MPCC is designed for. You have probably taken the width of the nosepiece out of the equation. You may need to find a way to compensate for that distance.
Peter
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