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Hi Ken
Can I buy in on this?
Focal reducers are designed specifically for one type of optical system. They reduce the focal length of the original arrangement with some form of correction for vignetting etc.
While a second reducer if placed inside the now modified (shortenned) focal length will certainly reduce the focal length even more, its correction elements will no longer be valid and the usefull FOV will not be improved. Just made to occupy a smaller area on you camera chip or in your eyepiece. The area outside this will most likely be of no practical use even if it is a wider field and subject to all sorts of distortion.
However you should experiment with the positions of the two correctors making sure that the overall focal length can still be focused on the camera or in the viewing eyepiece. This may not be possible if you can't move the focuser far enough forward in the OTA. However the result may be good enough to suit your purpose.
Barry
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