The 58mm XL Graphic Grandagon? Sinar offered that lens in their Norma catalog, I own one on a custom welded Norma flat board heavily modded by my Clockmaker friend. It DOSEN'T cover 4x5 almost 9x12cm wonderful lens. Focus it hyperfocally and the circle increases a tiny, 4x5 is pushing the envelope. I happen to like the dark corners.
The 20mm Russar Finder is something worth having. It is sweet to look through
BTW shooting some XRAY film wide open in a Graphmatic Holder wide open at F8. Back in the day Schneider advertised that the Super Angulon works well even wide open.
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