XPAN bulb setting

emanded

Member
Joined
Aug 8, 2008
Messages
40
Location
Warwickshire
Format
Medium Format
I was wondering if any of you inventive guys (or girls) have managed to work out how to extend the bulb exposure on the XPAN I from the maximum 4 1/2 minutes??
Up to an hour would be good but anything extra would be a bonus.
This is for night photography on ISO 400 film.
Many thanks.
 
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