I've read somewhere that you can run the Android app on MacOS with appropriate software. See link. Not yet tried this myself.

Bought a 55 AW II following this lead. Pleased to report K1 + grip + DFA 70-200 + OpTech Strap just fits.

It is a bit of a beast so I would recommend handling before purchase. However weight wise you might win over carrying several large aperture primes to cover the same range.

For reference this lens will fit in an Billingham Hadley Pro along with a K-1 with a FA*28-70/2.8 lens attached (and I guess the DFA24-70/2.8 also). You can just get the DFA*70-200/2.8 in the remaining location if you remove the tripod mount (and keep in a front pocket) and slacken the flap straps. I prefer to spare the shoulder and leave the DFA*70-200/2.8 at home when using this bag and often take the DA55-300 along instead.

I've tried several zooms out but not done any proper testing. After decades of shooting slide film I tend to frame my images quite tightly. This leaves me little crop room to remove edges / corners. The good high iso performance of the K-1 means there is plenty scope to stop down to get the best out of a lens and still retain a good shutter speed.

My FA20-35 corners still struggle at 20mm f11. This is a pity because the lens is sharp in the centre, has good contrast as well as being light and compact.

My F35-70 seems to work quite well. Nice and compact albeit limited zoom range.

My Tamron 17-35 2.8/4 is quite sharp over most of the frame even at large apertures. You need to stop down to f11 at 17mm to get usable corners. Even then the extreme corners haven't come good but area concerned is small enough that a typical print aspect ratio crop removes it. This lens is not too heavy (440g) and weighs the same as the DFA 28-105.

My FA*28-70 doesn't disappoint. I held off getting the DFA24-70 with the K-1 so I could check it out first. I've had this lens for many years and I'm sure the DFA24-70 is probably the better lens to buy especially given the price of a used FA*. The lens weighs about the same as the DFA24-70 (800g) and I find it a bit of a beast to carry with the K-1 on a neck strap. It was fine with the lighter MZ-S.

Weight is the issue I've found with the K-1. The body is a bit heavier than say a K-3. On its own this is ok but add an heavy zoom lens and the outfit weight becomes significant for me at least as a walk around option. This has resulted in me getting the DFA28-105. Lighter primes with their bright apertures are a joy to use on the K-1.

I've not yet tried my FA28 but the pictures I have taken at my typical settings with the FA20 (same optics as A20) and FA24 I have been more than satisfied with. Nb. I haven't bothered peering in the corners at 100% of large aperture shots. However I have found the corners on my wide angle zooms struggle.

There is a site with images taken on a K-1 with FA and later series lenses. Most of the comments are Japanese so you may have to see if a Google translation helps.

If you want a couple of files PM me and I'll see what I can do.

My MZ-5n has died too. Did you get just the gear or a gear and motor? Have you come across link ?

Cameras as described, delivered quickly and well packaged. Thanks,

There is one on eBay at the moment link

There is an example of 450mm f5.6 here link

Steve

I have bought Pentax parts on a couple of occasions from Johnson's. I did however know the part numbers incase that makes a difference.

Steve