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Matty the F3.3 is not suitable for DSLR use.
It will severely vignette the image.
The F3.3 reducer was designed to be used with the small size sensors, eg the Meade Pictor or similar size CCD's because it would only utilise the centre of the imaging circle thus not show the vignetting.
DSLR sensors are larger so they will show the outer parts of the imaging circle and any vignetting associated with these reducers.
You will still get vignetting with the F6.3 on a DSLR but not as bad.
EDIT: Doh, Mr Ponders beat me to it - yes listen to his advice Matt.
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