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I dunno about a 12" F5 Petzval APO Mike, but I know you could get a TMB LZOS 12" F/9 lens cell for $226,000 USD.. With a 4" 0.75x reducer thats available for $980, make up your own tube, use a 4" AP focuser on the butt end of it... All up I reckon $229k USD for the finished product.. add another 30k for a mount to carry it... 12" F/6.75 ~2060mm FL with a 4" flat field.. Dunno about you but that causes a puddle in my pants..
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