Update from ZWO
I had asked Sam (ZWO) about adding a heated cover glass (like the QHY163M has) to future model releases of the ASI1600 and I had this in an email reply from him today:
"you are corrent that we'd better add a heat board
but the back focus of current 1600 is too short and won't allow it to add one heat board
we will add one in our next APS-C camera".
So there you go, confirmation from the source, ZWO is developing an APS-C camera and it will have a heated sensor coverglass. Glad I bought the 36mm filters.
No details on the APS-C camera specs yet.
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