I had a (small) surgery a couple of days ago and can not go out for a week or two so my only playground these days is at home or in my garden.
I mainly take pictures (black&white) with my Pentax 645 NII (I have 2) and start to have a good collection of 645 lenses.
For digital I also have a K3 that I mainly use when I need to do color work.
One day I hope to buy a Z but right now is stay analog.
Last year I bought a Pentax-K Adapter for 645 that I hardly used (because my K3 lenses are quite good).
When I bought it (used from eBay) it was difcult to find information on adapters so this small review.
Putting the adapter on is staight forward and it is not heavy.
With the adapter you loose the autofocus so forced to go for manual focus (not an issue but you need to be aware of it).
As usual as soon you are in focus a small 'beep'/sign in the viewfinder informs you that the object is in focus.
I also have the impression that you can only do spot metering with the adapter on as I was not able to make changes to the default metering.
When you go to F11 or higher it can become quite 'dark' in the K3 viewfinder but not an issue when wide open.
(So the more you close the aprture the less bright the viewfinder is).
The medium format lenses on the K3 can look heavy but with the smaller ones like the FA75, FA150 or even the A120 it is ok.
(I am used with the 'heavy' lenses so no issue although they feel better at home on my 645).
As I am not able to move around a lot I though it could be a good to take some pictures in the garden with the
SMC Pentax-A 645 120mm F4 Macro put on my K3 so that you have some examples.
I am not a macro shooter but I thought that the results were not that bad (at least made my wife happy to see some of her flowers in the PC).
Although we are at F4 if find that we still have a very narrow depth of field and I like the bookeh.
So all pictures were taken with the K3 and the A120mm lens. AV mode. Is switched shake reduction off. No changes were applied (I imported the raw in lightroom and exported into JPG). I used a monopod as sometimes the speed was slow.
Below some examples.