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XPAN bulb setting

St Ives - UK

A
St Ives - UK

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Across the Liffey

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Across the Liffey

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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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