Originally posted by Gyroscope I have a 645z and 28-45. I am thinking of getting the K1 and 15-30. I am also considering getting a 75 f2.8 and possibly a 120mm macro. My concern is heading on a trip somewhere that I will have a failure or breakage of the 645 so I intend the K1 to be my backup but for this to work I need to use the adaptor obviously. Pentax don't seem to sell them new at least I can't find any.
Can someone tell me about these and how they are to use. Do you get aperture control and exif data etc. I don't care about the AF but I want to be able to use my 645 lenses on the K1 the same as I would on the Z, is that possible?
K1 is an excellent choice as a back up to the 645Z.
I do have a 645 to K adapter. I bought it from Fotodiox. It is a little pricier than the eBay offerings. I learned the hard way. In my Canon days, I bought a Pentax 67 to Canon adapter from Ebay for my only Pentax 6x7 lens. It did not focus properly at infinity. I ended up getting one from Fotodiox and it did work properly. Physically the two adapters look identical. For some reason the cheeper one stops just short of infinity for sharp focus. Subsequently, I ended up buying all my adapters from Fotodiox. As I mentioned they are pricier but they are backed by a good warranty and they WORK.
I have used my A120 macro on my Pentax K5iis and K3 with excellent results. The crop factor makes the field of view equal to a 180mm lens. On K1 the crop factor should be 1:1 or close to it. The adapter, as Adam mentioned is a hollow tube with no automation. It is usable in stopped-down mode only.
There maybe another surprise to come from Pentax regarding the use of 645 lenses on K1. I remember references to it in the rumors. Somewhere deep in the K1 specifications there is a reference to a large file size produced by K1. This maybe the rumored 645 lens combo. It is exactly the same size as the files produced by 645Z! I am surprised this feature has not been announced or questioned. If true, this would make the K1 the most versatile full frame DSLR out there. If we are lucky, this 645 adapter would be fully automatic making all new and old FA 645 lenses usable as if they were a fully automatic K-mount lenses.