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With a small scope (4.5" f8) and chronic bad seeing (deep E-W, west-facing valley in a mountainous area) I rarely get to test high mags on solar system objects. Seeing normally pulls up planets at 112x (8mm ep) or less but very rarely I've been able to go to 225x (8mm + 2x Barlow). I remember one (just one) beautiful clear view of Jupiter at 225x. That is the full 50x/inch limit. Never tested beyond as that is also the limit of my kit. Been to the equivalent of 500x with a webcam (NexImage + 2x Barlow) but that's different - using the power of stacking to compensate for shortcomings, both seeing and optical.
Usually view deep sky at 43x (21mm ep), brilliant richfield views, only to 112x for the brightest (bigger, but the views aren't great). However there are some dimmer objects that seem to respond well to magnification, while others just vanish (small scope). Never been beyond 112x with DSOs (except in other people's scopes!).
Cheers -
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