Durst recessed enlarger Lens Board (Siriotub)

This recessed lens board fits several Durst enlargers (M370, M670, M605, M707,..)

It is designed to be used with some 50mm lenses or shorter focal length where focus cannot be achieved with the "flat" board.

This board has a 38.4mm non threaded hole which fits a 39mm lens thread. (I had to heat-up the hole to soften the part and then screw the lens in order to thread the plastic.)