Check with Rich Simons at Star Instruments before buying to make sure they get you the field flattener that matches your mirror set. I'm the guy that started Star doing field correctors by sending Rich Simons several ZEMAX designs. He and Paul Jones (no relation we know of) bought ZEMAX, Rich learned how to use it with help from me, and they took it from there.
Field flatteners are not one-lens-does-it-all systems. They have to be matched to a particular set of mirrors. Paul probably still has the data files on your set of mirrors, so Rich would know which field flattener would be best for them. Their field flattener costs are low because the non-recurring optical and coating tooling costs have been paid for. A custom lens like Preston needs has to be done from scratch, thus driving up the cost.
Mike
-------------------- 56 mirrors, lenses, 16" f/6 Newt, 6" f/10 refractor, TOA-130S, Tinsley 5" f/15 Mak, 6" f/4 RFT, Coronado PST. Still to build: 24" f/10 Modified Dall-Kirkham, 10" f/26 Mak, 8" f/12 apo, spectrohelioscope, Herrig, Schupmann, and a new design you'll like.
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