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The optec reducer has a flat field diameter of 18mm....may be pushing it with a DSLR chip....fine for small chipped CCD's.
Do you really want to reduce a 600mm focal length scope to .5x with some vignetting.
.8x williams optic looks pretty good.
I would give the mogg reducer a go.
I think you want more flatning then reducing is this right Paul.
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