A recent thread here described in detail, how people estimate and bracket night time shots. This seems necessary because most light meters don't cover such dark scenarios. From my brief forays into astro photography I came to know about the "Sky Quality Meter" which essentially tells one how dark the night sky really is. Could this help me estimate accurate exposure times for night shots as well? Technically it seems like a very sensitive light meter, all one needs to do is establish a table for converting from their magnitude readings into exposure values. I could even imaging creating different hoods for the light sensor so I could restrict its angular coverage (would obviously require creating separate conversion tables for each hood). Has anyone tried this? Does it work for this purpose?