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Tripod shot. No flash, visual impediments everywhere. Ick.
Much better - boosted the flash and set the WB at 5600ºK myself. The flash over-rode the ambient light, the reflections never had time to impinge.
And finally, what to do when the press of the crowd keeps you away from the exhibit. Zoom your lens, shoot with boosted flash, and just crop your way in. Go for a decent depth of field and you're laughing.
55mm lens, +1 stop flash, through glass and sharp as I need it. And this from at least 4 metres away, cropped heavily.
One over-riding factor may be the degree to which the staff of the museum or shop clean their cabinets. Fingerprints, scuff marks, spare coffee rings - they all block light in and out. If you are using a wide-angle lens and stop it down they'll show up as marked, but diffuse blobs. It's in your interest to use as wide an aperture as you can get away with - keeping the depth of field that you need for the actual subject matter.
Bless the cabinet designer who decides upon a white or reflective shelf and backing - not only does it make your job easier, but makes the goods more prominent and attractive. The dear old cabinets from dear old Stirling Street had done duty as library shelves for decades before they supported our camera stock also for decades. they were tough and capacious, but wooden, and dark. Wehn we re-decorated with new cabinets they became a forest of maker's colours and the displays looked a lot better.
But beware the mirror cabinet. This may make the flash shooting a lot harder - indeed it may even carom the room lights into your frame to such an extent that you'll need to do extensive editing. You may not be able to persuade the staff to take the ancient Magna Carta out of the environmentally- controlled sealed case just so you can get a selfie with it...but you can always ask...