F8 surprisingly enough.

The M7 Helios 55mm was the culmination of a line of Helios lenses that was superseded by the Pentacon f1.8 50mm.
The M designation means M42 - there was an equivalent K series too, specifically for Pentax K.

These images are of a strange beast sent to us from China in the guise of Sweet Pea seeds. They turned out to be some
version of miniature vetch which, although having the appearance of sweet pea flowers, are about 4mm across !! The whole
crop takes up a 12inch pot and has grown to perhaps 15inches tall up some netting I gave it for support.
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Taken with a K1 and said Helios lens on the end of about 12cm of tubes, aided by a tripod and IR release.

Beautiful set. The trefoil and the oak leaves particularly. Give the 'marjoram' leaf a rub between your fingers. If it is it will smell gorgeous.

But all of them are the wrong way up despite the unarguable quality of the results

Admittedly it is a work of fiction but Horatio Hornblower's "Sutherland" was a flat bottomed multi masted warship designed and intended for Dutch waters before capture and transition to the English fleet. I would imagine the main problem sailing them would be leeway?

Yes, I agree with Sry. The viewer is gently placed in the scene and is invited to 'experience' it. A very successful 'revival'.

The detail in #4 is brought out wonderfully by the early light - e.g. the cobwebs round the door handle half way down the alley.

Nice images from a nice lens. I really like the first one. The f1.8 is a really rare beast but you can sometimes find the A series 2.8 135mm. That takes equally impressive pictures.

I've been e-Baying a lot of my (fairly large) collection, much to the approval of my own SWMBO but one that won't be going anywhere is the Jupiter 11A. (see b.forbes above). No, it doesn't need a wheelbarrow but it is certainly 'built like a tank'. It also has an ingenious double threaded hood that screws on both ways and it comes in a bakelite case that has a dedicated compartment for a desiccant. The lubricant in mine smells like old gun oil (nice smell) and the helicoid is wonderfully smooth. It takes fantastic pictures and is reckoned to be the best of the Soviet Sonnar clones, even beating the "celebrated" Tair. The 'A' in Soviet lens names denotes their version of an interchangeable T2 style adapter.

As an ex sailor that was a distressing read and I can't see any way around it. What is more enraging is that the skippers have lost their income stream and they face bankruptcy. Their creditors have lost their income stream too but theirs is somehow more important than everyone else's - so they seize the subjects of their loans - even when they are near worthless. The real losers can't seize anything at all.