Great tips! I'll see if I have room in my dome for a freezer. I have a spare one but not much room in our dome. We are integrating our eShel on a 24 inch Classical Cassegrain. My client wants to do super bright star work. Nothing as faint as 7th magnitude. For fainter stuff we have an Echelle on our 3.5-m that can go from 5th down to about 13th. We do have lots of experience reducing this sort of data here at the observatory. Right now I am more concerned about pointing accurately enough. It is an interesting idea to slew to field and offset using an off axis guider then switch to the guider on the fiber injection module for guiding. I'll have to consider that. Thanks again for the advice.