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This list may help - only the cheapies shown
Skywatcher - F4 to F6 - 55mm distance to chip - decreases FL by 0.9
Baader MPCC MkIII - F3.5 to F6 - 55mm dist to chip - no change to FL
Baader RCC1 - F3.5 to F6 - 92mm dist to chip - no change to FL
GSO - F3 to F6 - 70mm dist to chip - increases FL by 1.1
Quattro - F3.5 to F6 - 70mm dist to chip - no change to Focal Length
All of the above guarantee a 44mm corrected field
Cheers
Bill
EDIT: The Quattro should read 55mm distance to the chip
Last edited by billdan; 01-03-2018 at 07:50 PM.
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