to H3d39- I use this back as a back up and it is a great back. It works at longer exposures better than my leaf aptus 12 and the all over quality of the files is like 5x7 inch film. OK, phase 45 can much longer exposures but I never need more. Anyway is the same chip as phase one 45 and the H3d Body has great AF. One thing: the finder makes allways problems- the contact were changed but something wrong with the software...The red cast problem of the H3D can be solved for about 700 euro, after the service the back give great and natural skin color.
The H - backs have problems when used on tech cam with copal shutters- my back can only be used till1/15 sek, at 1/60 the image quality is horrible- only kapture one cable could resolve this synchronisation problem, cost 300 USD, but when used in field with centerfilter I neved need faster times.
If backs like H3d39 becomes so cheap it will be an option to buy one as a back up, even when it can not be repaired.
I would agree that the digital technology is nothing for a longer time period: cameras like Linhof Technika works great even after 50 years, all parts can be changed to new. All mechanical parts can be repaired, thats no problem, but how to repair a electronic part?
Even the digital leica can be serviced as long leica get the parts from china, were all electronic parts are made.
It would be interesting when there would exist a company like in the car industry that made parts for cameras- not only mechanical parts like lens boards, adapters, filters ..- but electronic like mainboards ect...