Thought I'd try out the high-ISO settings in poor light and see how colors, noise and sharpness comes out on my beloved little Nikon D40..lol.
At first I thought "whoa..that's bad!" - then I realized that some of the mosaic glass tiles on these goblets actually have texture that is only really visible in strong through-light..whew.
A good test for the auto-focus, since the reflections of light and the curvature of the goblets in low light really pull a number on the camera..lol. A couple I did manually, but it fools the eye as well, especially with varying degrees of opacity of the tiles.
Used a cheap 3$ LED flashlight and a slightly more expensive (4$) regular flashlight against blue velvet draperies in my office. The goblets are on top of my glass desk.
Can't do an experiment like this without sharing a few samples with my cam-lab-mates, so here ya' go!
Exposure time: 1.8s
Focal length: 55mm
Exposure time: 1/15s
Focal Length: 48mm
Exposure time: 2.2s
Focal Length: 40mm
Exposure time: 0.625s
Focal Length: 35mm
Nikon D40 + Nikon 18-55mm AF-S (kit lens)