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TEC140 is the dominant scope in the 140 range but 1 year wait for new and around US$6500 for 2nd hand.
WO 132 has seen some good images hereon this site.
TS Optics seem to be a good supplier.
APM do a 140 FPL51/lanthanum double which gets good reviews and its cheaper. They also sell a Riccardi reducer for it. Not sure if they sell a flattener but TS Optics sells one.
Greg.
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