That's the one Ken, it's a great example of the two main effects of adjusting aperture. The first shows a wide open aperture which gives a very narrow depth of field, and allows a shorter shutter speed (relatively), while the second shows a much greater depth of field with focus extending right back along the ruler but requiring an exposure 4 times longer, and impossible to hand hold with the available light.
f4.6 - widest aperture, most light, shorter shutter speeds, smallest depth of field of focus
f22 - smallest aperture, least light, longer shutter speeds, greatest depth of field of focus
So for your model shots Andrew F22 would be much better to get all of the model sharp, but a tripod or beanbag and timer release of the shutter will be essential to remove camera shake.
ok, i've been having a hard time wrapping my head around this, but that makes sense







