Originally posted by panoguy I thought the Samsung PK-NX mount adapter (MA9NXK) had aperture control. At least it has a lever inside it to open the aperture up on PKA lenses.
Many of the old Samsung "Schneider-Kreuznach" K-mount lenses (rebranded from Pentax) lacked aperture rings entirely... and that's what the adapter was made for!
I believe that the Samsung adapter has a mechanism to control aperture on DA lenses that don't have an aperture ring, but there is no automation whatsoever. Unless I am mistaken, the lens stays permanently at whatever you set it with the adapter (or the aperture ring if you're using a lens with such a thing) and is completely decoupled from the camera body. This is unlike on a Pentax body, where the lens will (usually) remain fully opened and will only be closed down briefly (and automatically) to your chosen aperture once you hit the shutter. The behavior of (dumb) adapters isn't so much of a problem when you're shooting portraits wide-open or close to it - in fact, I think some people prefer it, since it gives you a kind of permanent DoF preview (and possibly automated metering) - but for macro it's less than ideal as it makes it harder to put the center of the zone of focus exactly where you want it and will also cause a very dark viewfinder at very small apertures like F/16 or greater.
That being said, longer native lenses with diopters also produce good macro results, so maybe that would be the way to go. And if the NX1 is popular, perhaps some third party macro lenses will come eventually... Right now, for me, it looks like possibly K-3 first (probably between now and xmas). Then, depending on where Ricoh is by then and how the NX1 gets reviewed, in about one year I'll be looking very hard at Samsung (with either the NX1 or the
rumored smaller "mini-NX1")...