Detail of the plumage on the cormorant is very well captured.

Looks like somewhere I would prefer not to be in that weather. I salute your hardiness !

Gorgeous.

Just put mine on a K1 with a Pentax adapter and it snugs up perfectly. I shall have a play with it tomorrow.

Those make a really nice set.

I agree with Richard.

Curious. You are quite correct! I thought the awkward ring on the front was simply an auto/manual switch - admittedly to assist with focusing. When done, you turn the ring and it acts as a pre-set device, stopping down to the value on the aperture ring. BUT I failed to notice that when set at 3.5 the iris still visibly covers part of the available orifice through the lens. When you turn the front ring the iris does indeed open fully. Clever idea but one of the reasons it failed must have been that it is a complete pain in the bits to operate in the first place !

Beautiful watery pictures without a dairy load of milk added. Very nice.

I went out looking for something 'bright' to liven up a grey winter day and I put a 50mm f3.5 Meyer Optik Primotar on the K1.
It's resolution is quite remarkable, as shown by the full frame and 100% crop of a shot from the local park.




and crop (which is much clearer on a big monitor).



As to colour, I found a Berberis bush with thorns to make anyone think twice!



and some rose hips






If you examine the various control rings on the thing you will see that they had no notion of 'ease of use' in those days, probably because setting up the camera and lens to take a picture then was such a finicky task anyway !

Comments are, of course welcome.

It's interesting that the polarizer has removed that bright white falseness that usually comes with IR pictures.