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Thanks James, yes this is for photography and what you've mentioned makes sense.
But I will need a decent amount of clearance between the CCD and the top of the focuser to allow for an OAG, filter wheel or a different camera, so the corrector would not be near the ota edge, most likely at the top end of the focuser.
if I use a standard focuser, that height plus the gap I need would increase the distance to ccd, bigger secondary, broader focuser. if its low profile, the cone size at the focuser base won't be as big so I won't need too big a secondary.
The baader one looks good but is only 2". TS have the 3inch Orion focuser for 249euro, but direct price is a lot higher. still looking around.
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