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I would like to know more about flattener spacing though, what's the story with that?
Baz.[/QUOTE]
Flatteners and reducers have a metal back distance. Metal back distance is defined as the distance from the rearmost metal part of the reducer or flattener to the plane of the CCD chip. This is where it has been optimised to work best.
So you whatever reducer or flattener you get you need to find out what the metal back distance is for it. Then you will need an adapter made to be that length so your camera is at the correct distance from the flattener.
You will also need to know how far the surface of the front of the chip is set inside the camera body. This is usually stated in the specification for the camera and often there is a little white mark often with a small circle on it, that tells you where the front surface of the chip is. Now you can measure that distance.
Greg.
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