IA - Member
just not keen on paying £15-20,000 for a back
But making a custom back of similar resolution I'd expect be be 10x that. One off technology is always more expensive - where would the cost savings be? Just buying a sensor, if you can, will be very expensive ...
It's not purely for any savings. Part of the fun is the project, both construction and programming. I'm a bodger, I like one-off technology. (I do have some experience making computers and programming, although that dates from the days when I used to solder extra memory chips on and pray it wouldn't bork the board, and I've some experience in new fangled languages like Algol68).
I'm not expecting to find a large sensor cheap, but the major problem seems to be getting them in quantities less than thousands...
It looks like I could buy a secondhand back for the 645 camera at a reasonable price so I'll get one for that anyway.
The 680 though, I want mucho megapixels.
The most useful sites are the amateur astronomers - there's a few useful homemade cameras there and a lot of useful info (not necessarily directly usable, but a good guide to direction).