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Long subs using the L Exteme filter is Camera and Focal length dependant
I use an L Extreme with my ZWO2600MC on my 8” f5 newt ( Bortle 3 skies ) and 6”f6 newt ( Bortle 8 skies ) with full moon or no moon and my subs range from 90 sec to no more than 3 minutes, with 1 to 3 hours of captured data) on Planetary and Emission nebula with fantastic results
Cheers
PS my 2600MC has an internal UV/ IR cut protective window
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