could you also explain to me what the M and the CF lens means exactly. -and in what way it's worse to have a camera without CF lens and not a real SWC M? Sorry but i know very little so far, but getting better
The "M" means Modified.
But first, perhaps, the SWC?
The original camera, introduced in 1954, was called Supreme Wide Angle, which was changed to Super Wide very shortly after.
In about 1959, the Super Wide was given the same barrel design and Synchro Compur shutter that the other Carl Zeiss lenses made for the 500 C were using.
The "C" stands for either Central shutter (a.k.a. leaf shutter) or Compur, "Super Wide" became SW, these things were put together, producing the name for the camera: SWC.
In 1980, the SWC was modified, and a "/M" was added to the name.
The modification involved raising the vierwfinder and lowering the tripod coupling plate, so that a Polaroid magazine would fit in between the two.
A polaroid magazine on the camera makes it impossible to wind the crank a full 360 degrees, so the modiciation also involved adding a ratchet mechanism to the crank, so that you can 'pump' the crank instead.
The factory also produced a kit at the same time, allowing any existing SWC cameras to be converted in the same way. The kit also contained a new name nadge, bearing the SWC/M designation.
So even if the serial number would suggest a pre-SWC/M production date, a camera can have the SWC/M name, plus the modifications that justify calling it an SWC/M.
"CF" is a designation used for lenses.
The "C" still stands for Central shutter, which these things still have.
The "F" stands for Focal plane shutter.
CF lenses (and the later CFi - i = improved - and CFE - E is electric - lenses) have a little button that allows to disable the shutter in the lens, providing the benefits of instant mirroro return when used on Hasselblad cameras that have a focal plane shutter.
CF lenses also have a different barrel design, with very much improved ergonomics.
The SWC/M was given the new barrel at the same time the other Hasselblad leaf shutter lenses were changed to CF. But obviously not the "F"-mode: you need to use the leaf shutter.
The CF designation was used anyway, to mark the other differences.
The camera's name however remained unchanged when this happened, and was still called SWC/M.
A SWC or SWC/M with C-lens (Synchro Compur and not-so-good-ergonomics) is still a very nice thing to use and have.
do you think too, that the blue corners at a aperture of 5.6 are not normal?
Hard to say without seeing them, and without knowing how the image was produced. Can you post a picture?
But generally: no. There is a good deal of natural (i.e. cannot be helped, and something all lenses have) light fall-off. But we usually do not notice it at all.
So yes, it is normal that there is some darkening. But no, it should not be that bad that it sticks out immediately.
One thing to think about first, though, is vignetting caused by a hood or filters.
regarding all these information and that this SWC M is a very early one, do you think the price for body, magazina and viewer for 3000$ is all right or too expansive?
Given that the SWC line started in 1959, the SW-line itself back in 1954, i wouldn't say your 1978 camera was a very early one.
But US$ 3,000 is indeed too much to pay.
You can even get very nice later models (i find the 903 the most desirable, followed by the SWC/M with CF lens) for considerably less than that.
So my advice would be to shop around a bit longer.
When doing so, also have a look at what viewfinder is on the camera. The later model (1985) is a more square type, the earlier one has a rounded funnel tapering towards the eyepiece.
The early cameras do have a bubble level on top, and the old style viewfinder has a prism on its side allowing you to see the bubble without having to move your eye (and the camera) much.
The newer finder has the bubble level incorporated, and it is visible through the viewfinder itself.
Because of that, later SWC/M bodies do not have a bubble level on top anymore. You will need a later style viewfinder with these if you want to have the benefit of the bubble level. (The newer finder is nicer to look through too, so it generaly is more (very) expensive, when you need to buy it separately).
