My lesson:
Take 2 pictures:
1. f/2, 1/30 s shutter speed, and ISO 100
2. f/2, 8" shutter speed, and ISO 100
Ok, my Nikon D-50 does not have a low f/2 stop, nor does it have an ISO of 100. So I did the lowest I had on both settings. I used an f/5.6 with an ISO of 200 and the above shutter speeds.
Next, answer the question "What would the new exposure be?"
The answer I would give: A 'blown' exposure - or an exposure that is too bright.
One thing Art has said from day 1 is that shadows can almost always be altered in Photoshop, but 'blown' exposures (too bright) means the data is lost forever. It can never be recovered.
Tomorrow I shall see if this is the correct answer. What do you think?
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