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As Rob said we did a bit of barlow stacking, and to be honest it was OK, but now I would suggest to do it some other way.
The 5x Powermate is really the only way if you have a scope with a native focal length of about 1000mm. (I use it on the 10" f5 newt, 1250mm).
Other option is what I also do, use eyepiece projection. I am actually favouring eyepiece projection, as it allows me to fine tune the image scale, by using differing eyepieces. With the fixed 2.5x or 5x Powermates I am limited to these amplifications, whereas I can use either a 16mm, a 12.5mm, a 10mm, an 8mm a 6mm, or a 4mm (all Zeiss orthos), with the 12.5mm being similar to the 2.5x.
Try it, you may be surprised.
Gary
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