It will depend on how well your mount guides. The pixels of the 1600 have 2.5x the area of those on the 183, so with the latter you’ll be wanting to expose longer to get comparable SNR. At f/6, you’d probably be aiming for around 5 minutes.
They are both versatile cameras with their pros and cons. The 1600 is the larger sensor, so consider the types of targets you’re interested in and simulate how they fit in your FOV with planetarium software.
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