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Setting aperture and iso for long bracketed exposures

SFBob

By SFBob,
in Sony Alpha Full Frame Cameras

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SFBob Newbie

SFBob

Posted
Posted
I'm a new A7R iv owner and been playing around with bracketed HDR using long exposure times on my tripod mounted camera. 
 
Ive attached a shot I took yesterday (edited with Aurora HDR).
 
I originally tried to shoot this at an aperture of f 11 with an iso of 100, but the exposure time would have been > 30 sec (which is the slowest exposure time offered in the setting for keeping the iso at 100). 
 
Only at f 4 could I get the slowest bracketed exposure time to be less than 30 sec.
 
I did constrain the iso to be 100, but is there some limit on exposure length that I am not aware of?
 
Arguably, I'd like the camera to take all the time it needs to shoot the image at the chosen aperture and chosen iso setting.
 
I'm sure I've done something wrong in the setup, but I'm not sure what!

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