Hello,

What is the recomended diameter size for holes in 4x5 vacuum film holders (does anyone have a Linhof vacuum film holder to check?).

In Ladislav Kamarád's website he says that he use 0.6mm holes for 220 film and "Micro Diaphragm Gas Sampling Pump KNF NMP 09L".

Also, does anyone knows online stores to order small vacum pumps?

Thanks