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As far as I know an f5 petzval consists of an f12 achromat doublet objective combined with a two element reducer/corrector. It is difficult to collimate and will still have chromatic abberation unless expensive exotic glasses are used. These comments are based only on things I have read not actual experience.
I would suggest spending $1800ish for a Vixen NA140 neo achromat at f5.7.
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