Originally posted by HeadsUp7Up She shoots newborns, corporate headshots, and architecture so speed of shooting isn’t an issue.
I shot weddings from 2004-2008. At the time I was shooting Canon system and had Canon APSc bodies until I got the 5D FF body. One early decision saved me a lot of time and grief. I always had two identical bodies at all times. The reason was that I did not want to fumble with a different set of dials and menu layouts. When I finally went back to Pentax, I ordered the K5IIs followed by a K3 and a second K3 shortly after that. By this time I was not shooting weddings and most of my gigs were corporate type projects. As such, speed was not as important anymore. I later bought the K1 but did not buy a backup for it as I used one of the K3s for back up. The beauty of my Pentax set up was that I never had to use my back up bodies. My primary cameras never failed me, not even once in almost 6 or 7 years of shooting with Pentax system.
My suggestion is to get another K3 to have two identical bodies. K1 is a beast and a low light dream camera. The K3, not so much. If she encounters a lot of low light situations, having to bump up the ISO, she would benefit from the K3III a lot. A second K3 would be the cheapest option, double K3III would be the most expensive. You have a lot of choices. Used K1 and KP for low light with APSc and FF capability. Double K3IIIs for APSc only with excellent low light capability. Or as suggested earlier one used K3 for the cheapest option cost wise.