There is seems to be a morbid attraction to Nikon. I have bought and sold (or returned) a fair array of Nikon equipment over the last couple of years, but here I go again. Economically a brand change is actually not that bad, I could make enough return on my existing kit with little depreciation (for the lenses as least) that it should come in at about the same cost as a body only upgrade with Pentax. So this time it is a Nikon 10-24 that caught my eye for a price too good to pass over. I just need to get a body to go with it. I think I know a little more about how to set the D7100 up to my liking now (on paper at least), so maybe it will stick this time!