Originally posted by 2351HD I have both the 645Z + 28-45 and the K-1 + 15-30. I actually do not think the 15-30 is all that great, especially using it handheld. The K-1 struggles with accurate auto-focus at the wider end, will get it right approx 50%. It is ok on a tripod, but still no 645 system. Plus filters on the 15-30 are a trouble. In fact I am having my doubts on the K-1 as a whole, I feel at this stage that its a bit of a dog, but I need to spend much more time with it to evaluate as its a picky thing to get optimal results with, a very different beast to the 645z which is a easy to get top quality results with.
I am most likely going to sell the 15-30 and get either a Zeiss ZF.2 18mm f/3.5 and adapt it to ZK with Leitax, or a Zeiss ZF.2 15mm and adapt it, or wait till the new Irix 15mm f/2.4 for Pentax K comes out, as all 3 of them can take screw in filters.
One thing to note, many people had QC issues with the DFA 25 and DA 25 for 645, some of them just falling apart.
The whole filters thing is my biggest reservation about the 15-30 as I use them all the time. I've made a decision to get the K-1 and the 24-70 then wait and consider my options for the ultra wide later - hopefully the Irix pans out well.
The 645Z will remain my core landscape camera which suits about 80-90% of my shots, the K1 is a backup and also gives me some longer focal length. It's also an experiment for me to see how it goes against my 20 year experience with Canon and if I warm to it whether I sell out of canon or keep a foot in each camp. At this point in time I can't see myself getting rid of my 5D3 and 50mm f1.2.
I am curious why you refer to the K1 as 'a bit of a dog'?