You could try cleaning the battery contacts and also the electronic contacts on lenses and bayonet mount. Maybe dampness is causing a poor connection.

Up to about a year ago I could have supplied you with magnesium ribbon or flash powder, as you preferred. Now they have been safely disposed of, I'm afraid only the Brownies remain.

That can't be right - there are f1.2 lenses in 42mm screw mount. The K mount is quite a wide throat, much wider than Nikon for example and significantly wider than 42mm.

I don't see why an f1 lens couldn't be made, especially as so many lenses break all the theoretical rules anyway these days.

A average is meaningless as it also could include those who earn millions per year. A typical low earning wage could be half the average, and a lot of people in the UK have to exist on that.

Statistically it could be that no-one earns the average wage, only extremes above or below. It could mean anything. The only thing we are being told is that it's the average of the figures that were included.

We don't even know how big the sample was and whether or not it is truly representative of the population as a whole.

An average that exceeds the earning capacity of a lot of people exisitng on less than half that amount.

I would suggest using a card reader instead.

The Yashica/Contax bayonet is unique to those marques. Adapters exost for various combinations of lens/camewra but it's often not worth the cost unless it's a simple one for using screw thread lenses.

Manual focus, careful lining up to avoid reflections and maybe a polarizing filter.

SRB Griturn are the people to help you - if they can't make or sell an adapter to you no-one can!

Did you format the card in the camera before use?

The best way to view the images on the computer is to use a card reader. These are inexpensive and efficient.