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Cheers mate, I was running in MM setting F8, ISO100 and using the IR remote. Opening the shutter and timing with my iphone 20sec, 30sec 40... etc until the exposure was right. It's a bit fiddly with focusing up and composing the shot without the filter, adding the filter and getting the phone out.
Oh well ill keep practising. I was using an iphone app to calculate exposure but it was always under exposing the images, maybe this was a FF app.
Your shots are great!
If A mode isn't working natively and you need to calculate, remember F-stops and doubling/halving of shutter speed are equivalent to exposure stops, so if adding 10 stops with an ND filter, you could first, without the filter on, use A mode to get a good exposure time for the scene at f8 and base ISO, and then with the filter added double that shutter speed 10 times to get the same exposure.