Lets have a look at say the 14mm lens on a full frame Canon 6d. 600 divided by 14 = 42.8, that gives a shutter speed of around 42 odd seconds, double of what you can use on the other combo. Lets have a look at the normal 50mm lens on a full frame 6d. 600 divided by 50 = 12 that means we can only use a shutter speed of 12 seconds.
Canon EOS 6D and a EF 24mm F/2.8 IS USM Lens. 24", f/2.8, ISO3200. Recommended Camera Settings for Night Sky Photography. Shutter Speed: Use a shutter speed of 30-seconds (30”). Be sure to look for the “symbol on the display as it’s easy to accidentally set a short 1/30th second exposure.
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canon 6d mark ii night photography settings