As you originally asked about changing over to digi costs, and if it is your intention to find a digital equivalent to 5"X 4" or even 6X7 film, then you are looking at a multishot back ( Imacon, Jenoptic, Sinar etc.), a monorail camera with DIGITAL lenses or a Digiflex II with shift lenses, the cost ? .... between �20K to �30K, I believe others have also mentioned similar figures, please don't get me wrong, this is not to frighten you, this is reality.
In addition to this you cannot ignore the photographer's experience and knowledge of colour management and the handling of digital files, this will make or break any digital image. You simply cannot expect your film based photographers ( no matter how good !) to fork out �20-�30K and instantly produce perfect images, it is a long and steep learning curve.
If you do not require such high quality I would recommend something like a Canon Eos 1Ds with shift lenses (around �7-�10K), this setup will produce very good images ( in the right hands of course !) but not in the same league as the aforementioned multishot backs, however it may suffice you image/budget requirements.
Hope this helps a little bit.
Best of luck,
Barry
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