To be fair, whilst the 50mm Distagon was not a fast lens even by 1950s standards it was: (1) fitted with a lens shutter, which never makes it any easier to produce a fast lens, and; (2) designed to cover the medium format not 35mm which also places constraints on speed v size and weight. So I'm not sure it would qualify as a slow lens, either. Considering the above points, it was pretty average speed wise, yes?
Hasselblad have been keen to promote the retro-compatibility of their backs with their classic V series SLRs for some years.
In November 2009, Buzz Aldrin was pictured on the cover of Victor Magazine. He had travelled to the Kennedy Space Centre as it had of course been forty years since the Apollo 11 flight and was photographed at an event there by Marco Grob. The cover photo was taken with a then-new Hasselblad CFV-39 digital back, fitted to one of the original cameras used for the Apollo astronaut photographic training. Frustratingly, the article doesn't say which model camera it actually was, but I would hazard a guess it was probably a 500EL since the EDC was based on that model. The current model back you have purchased continues a tradition of several years now of the company's older model digital backs also being able to be used with a number of early model film Hasselblad bodies.
Cheers,
Brett
