The brighter the light - the sharper the sights. Just like stopping down a camera lens the eyes depth of field increases as the pupil gets smaller (which it does in bright light).

Like many of us, I tend to practice in the middle of the day. When I went over to doubles from scope sighted rifles I practiced a lot. then, when I shot my first goat in the forest at dusk I realised that the sights were not nearly as clear as in practice (and it was a white goat).

I now have a bit of a shoot at dusk most days at the farm (I can shoot off my deck, or, if my wife's away, through the open lounge room door - but not the 470 - things fall off the wall.

Another thing I find helps is wearing dard sunglasses when moving in and out of heavy scrub. The eye adapts to bright light by making the pupil smaller, letting less light in, and also by destroying pigments in the retina to make the retina less light sensitive. The pigment is destroyed in a minute or so but takes 15 minutes to build up when entering darker areas. Thus, by judiciously taking off and putting on your "sunnies" you can maintain good vision in less well lit areas.

mike