I am sorry if I have given you the impression that I have such "expensive" item. I put the post out just as the title " some interesting item".
I believe all these DB are for some certain brand of camera...Mamiya, Bronica, Hassel...etc. Thus if these bodies won't allow long exposures, it is a pity....
I have always assume that they will function like the good old film cameras which I have had some experience. I have even made my own large format body (4X5) to accomodate the old areal lenses.
That said, dark subtraction can always be done manually if noise reduction is not available in the camera. In fact, I prefer doing this manually to any of the "built-in" dark reduction function of any camera.
For any exposure, simply cover the lens and make a "dark" exposure of the same length. This is the dark frame to be subtracted from your "light" frame, to reduce the noise. This dark frame should be taken at nearly the same time (sure enough you cannot make this at the SAME time), or better one before and one after the "light" frame, and get the average, to minimize the effect of temperature change.
PTS |