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The 200 f6 has the stock 50mm secondary (as its built primarily as a visual scope), and gives 100% illumination at a field radius of 0.4" (10.16mm) with 93% illumination in the far corners (13.34mm field radius). So some vignetting, but fortunately flats looked to have kept that under control.
[Re my elongated stars in the RA axis - i think my 'RA Aggressiveness' might have been too high in PHD Guiding (was set at 100). Have lowered it to 80 and will try that out during my next session.]
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