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Hi Markus, Dust on the sensor is only a very occasional problem when using prime focus, [ I personally have never had it happen], provided that when the camera has no lens fitted, it is laid down face down.
If the mount you refer to for utilising the scope's eyepiece is a bracket that allows you to put the camera up close to the eyepiece, [afocal
method], you focus the eyepiece first, put the camera with it's lens fitted
up to the eyepiece, and finally focus the camera.
The other kind of adaptor allows you to put your eyepiece of choice into
it and attach it to the camera with a T-ring.[ eyepiece projection method].
At the very beginning don't bother with separate darks, flats, etc: just
enable the camera's noise reduction features, and it will take a dark after each exposure is completed. The colours in your image are strange, but
that is for later. Eta Carina does have a large area of nebulosity around it.
raymo
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