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Who is good at what, and where a system stops

Most makers here are excellent at one thing and unremarkable at the rest. These pages set out which is which, what staying inside a system costs once its cells, plates and dedicated flash are added up, and where a single factory ships the same optical design under three different badges.

Each amount in a write-up is what the listing showed when that page was written. The figure next to the product is pulled in as you read, and it is the one that counts.