壼坂電機の面光源（別名ビュア）はカメラ検査などで使用する透過チャートを装着できる機種が多数存在します。
透過チャートメーカーによって、外径寸法は様々。標準的な各社のチャート寸法と、それに対応した面光源をまとめてみました。
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