Specifically most 'planetary' cameras, which are relatively in expensive, are not well suited for deep sky imaging.
Planetary cameras typically are designed with small chips and pixels and pixel count to achieve very high frame rates.
Planetary is imaged using video formats typically .
Deep sky requires long duration single frames which are later registered, and stacked.
One of the biggest issues is with planetary is sometimes there is simply nothing in the sky to image. Right now a few major planets are visible in the very early morning hours. But as you know that changes over time.
Anyhow just thought I would try to explain all that.
