[brettnjan (Brett)]

Hi - we are new to this forum and are wanting to dip our toes into the world of astrophotography. We have a Canon 6D Mk1 that we use for travel and landscape photography and are now looking to purchase a suitable refractor to pair with it. The Canon sensor is 43.04mm across the diagonal. A couple of the scopes I am considering are the Sky Rover ULT 115 ED APO triplet or the Sky Rover Reference Series ULT 102 ED APO triplet. These scopes have a 3" and 3.5" focuser respectively, so presumably without a reducer flattener and using 48mm T-piece there will be no vignetting issues. However, the dedicated flatteners for these scopes are also 0.8 reducers and yield an image circle of 42mm. Presumably this means the image will not fully cover my sensor i.e. the extreme corners will be black? Also are there likely to be vignetting issues even within the 42mm image circle that would further reduce the usable portion of the frame? Just not sure if this combination will be slightly compromised or whether this is a completely normal set-up. Many thanks for any information to help me understand this better.