ckcarr
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Thanks guys!
It was a last minute grab, I actually had time to only take a total of 9 shots before it was dark. It's a waiting game for me, until the last car leaves because it's part photography but a large part just absorbing the solitude of the place when you have it to yourself. Looks like tourist season is finally winding down.
Bard, as far as ISO 400, the general rule (at least with landscapes) is you try and stay at the camera's base ISO as much as possible, usually adjusting aperture and speed. What I'm not clear on is whether it's better to go slower than base ISO. The triangle of exposure is aperture, shutter speed and ISO. Each affects the other.
But I wanted as much sharpness throughout, so according to Thom Hogan (one man's opinion of course) diffraction might start setting in at an f/16 aperture on this particular camera sensor. Also, unless you use "bulb" speed to extend the shutter speed beyond the Nikon 30 second limitation and compute exposure manually and have a MC-36 remote release to program it in, the easier step is to just up ISO (without creating noise). Leaving aperture constant, going from ISO 200 to ISO 400 cuts exposure time by 1/2. Therefore I tried the base of f/16 at ISO 200 but it wouldn't work. At f/16 ISO 400, the exposure was just on the edge of 30 seconds, any darker and I would have had to up it further to maybe ISO 800 or open up my aperture, which might not have made a difference at that point since the detail was fading. One last thing, the longer the exposure, the more chance of movement (even on a tripod) so you may as well consider ways to speed up the exposure time.
If this is a bunch of balony I'll delete it. 
The shot was ISO400, 30 seconds, f/16
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