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Alex I would try for a higher f/ stop again , the main reason for this is that most lenses have a sweet spot ( the best f number for the focal length to give the sharpest image ) at something between f/8 and f/16 . My sigma 18-250 works best at f/16 , if you find the camera under or over exposing your shot try dialing in some negative or positive exposure compensation or make a note of what your camera settings are then go manual and just adjust the shutter speed to get your desired results .
The set up I use is :-
Tripod , aperture priority @ f/16 , auto iso off and set as low as pos , spot metering , mirror lock or in my case exposure delay mode , remote release or self timer .
then if the exposure isn't right I dial in the exposure compensation .
Hope this helps a bit .
Mark
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