DA to me would mean that it's optimized for the digital camera
sensors, and might not return the best results at corners and
edges on 24x36mm format. That does not mean that it would be
unusable, and it might in fact work quite well.
It's not hard to make a 40mm lens that is well optimized for the
16x24mm digital sensors and is still perfectly useful for 24x36
format. It's not like making a 14mm lens, where optimization for
the smaller format and overall size/weight/cost concerns means
it will likely NOT be a very good performer on a larger format.
Godfrey
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