Phase one lightphase contax 645
If you do get a digital back for your GX680, and it starts to make sense once you get to the larger-than-35mm ones, you'll probably need a Hasselblad V mount digital back with a Kapture Group adapter. You do NOT want to shoot a long exposure with a Dalsa sensor - even to this day (the megabucks Phase One IQ series and Leaf backs are similarly afflicted). Remember, these are 35mm full-frame sized sensors, so you'd probably be better off sticking a used Canon 5D on the back! Especially if you want to shoot above ISO 200, or make exposures longer than a few seconds. Generally H5 was the name used for the 6MP version and H10 for the 11MP version. Phase One's naming policy was all over the shop in those days so the same back might be called a Lightphase for Mamiya, a Lightphase C645 for Contax, a H10 for the Hasselblad V, and a H101 for the Hasselblad H1. They use Firewire 400 for power/data so that's good. They had 35mm-sized sensors (6MP with 12 micron pixels and 11 MP with 9 micron pixels) made by Dalsa. There were basically 2 different Lightphase models.
#PHASE ONE LIGHTPHASE CONTAX 645 PC#
Especially if it is not sold with all original cabling, power supply, PC cards, and software.ideally, in fact, with the actual PC/Mac/Laptop it was used with. It doesn't user Firewire or any other "nice" modern standardized interface, so I just wouldn't bother with it.
#PHASE ONE LIGHTPHASE CONTAX 645 SERIAL#
The IJ27503 you quoted is just a serial number, BTW. Their backs never really caught on, outside these niche applications. Many of those smaller makers are now gone, or have exited the photography market to concentrate on niche scientific/medical imaging.
![phase one lightphase contax 645 phase one lightphase contax 645](https://images.squarespace-cdn.com/content/v1/55d537b4e4b0c18ea41a132c/1548353991110-JR81LID1RHARQGXF9D7N/ke17ZwdGBToddI8pDm48kL-PDEV0kc4nkv6ZO74dbct7gQa3H78H3Y0txjaiv_0fDoOvxcdMmMKkDsyUqMSsMWxHk725yiiHCCLfrh8O1z5QPOohDIaIeljMHgDF5CVlOqpeNLcJ80NK65_fV7S1UfdVC79UZfxPkMeg9HFyXpQQifYSi4HMBv5Z68sTGDeU_XaCZ2eR_PUwOvzfpR6u4g/Fuji+GFX+Schneider+Cinelux+(2+of+2).jpg)
That changed once Kodak brought out the first modern self-contained backs, the DCS Proback in 2001 and DCS Proback 645 series in 2002. The backs were so dumb that the R&D was not beyond smaller companies. In the late 1990s and very early 2000s, there were dozens of such backs from a large number of makers.
![phase one lightphase contax 645 phase one lightphase contax 645](https://usermanual.wiki/Phase-One/PhaseOne645DfUserGuide778394.313569999/asset-c.png)
They must be connected to a PC/laptop for everything - power, user operation, image transfer and storage. OK first of all - you are fully cognisant that both of these items you mention are tethered-only backs? - no LCD, no battery, no memory cards, no built-in user interface of any sort. It's a fascinating world to explore, but you may find that it ultimately leads you nowhere. Been scouring ebay for bargain basement digital backs, eh?