This is not true of all backs.
I have been using the latest iteration of a Hasselblad V system digital back, the CFV50c for over two years now and all you have to do is mount it on the camera like a regular film back, power it on and get down to business. I simply re-cock the shutter like I would any back and it is ready to go. You don't have to re-set the back or attach a cord, it works just like a film back except that you don't even have a dark slide to pull.
I paid $9,995 for mine new, the person above who claimed it went for as low as 5K must have been talking about a different back, no way on the CFV50c. I find the back outstanding and well worth the money I spent, it paid for it self in 3 months. I also find it is by far the best digital device I have ever used for long exposures, 20 minutes is fairly routine. The files it produces are just flat out gorgeous with better color and range than anything I have used to date, including the D810. It is also fairly small, only a little bigger than a film back and gets great battery life. Focusing MF is already kind of a bear so the fact the back has live view really helps to keep the image quality as high as it can be. And since I use this back with a 500ELX, four 501CM bodies and 9 lenses, making sure they all are in spec via live view is a breeze.
I was hesitant to spend that kind of money at first, but the goal was to get a system going within Hasselblad V that allowed me to seamlessly work with both B&W film and digital on the same outing with the same camera. No other system does this as well as the V system with a digital back.
Now all this may or may not sound great, but you are going to have to buy it used. Hasselblad
discontinued it last year when they got pinched for sensor resources for the new X1D. And considering the position they are now in with DJI, the CFV50c might very well be the last digital back they ever make. I am fine with that though, because with truly great files even at ISO 3.200 and 50MP, it is the only one I need for my V system.
You can generally find it used for $7,000-$9,000 depending on all the usual things like timing and luck. I love it, very glad I have it.
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