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HI Stefan
I'm afraid without the provenance of the 'melt data' on the glass, giving a designer the figures of the actual measured dispersion and refractive index of the individual pieces , this glass is really just `land fill ' .
If you were going to actually manufacture such an instrument you would just buy new glass with all the required melt data - BK7 is not very expensive compared to the value of such a finished instrument . I'm not trying to be picky - its just one of those cold hard realities of using optical glass. You may be able to fudge the result by sticking to the design and aspherising one surface via null test in the end result ?
I've thought about these all spherical designs , but to be honest polishing and figuring 8 optical surfaces just doesn't seem to make any sense compared to one paraboloid and an off the shelf Wynne corrector ( at F3 ) . Maybe I have missed something !
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