How to load 4x5 sheet film holders

since: 2018/02/14
update: 2018/06/09
reference:
1. YouTube: How to load a 4x5 inch film holder
2. Large Format (4x5) Camera Operating Guide
3. Shooting Large Format Film for the First Time - YouTube
4. Loading sheet film holders in 9 easy steps (4×5″) 
5. How to Load a Large Format Film Holder

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    (source from: Shooting Large Format Film for the First Time - YouTube)

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備註:
1. dark slide 的上部邊緣有白邊與黑邊二種, 以提供曝光時識別之用:
    白邊朝外: 有尚未曝光的底片
    黑邊朝外: 底片已曝光, 或者是空的.

2. 承上, 白邊可在黑暗中經由手指觸碰到凸點來識別.

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