If you mount a Linhof 001693 Graflok 45 to Hasselblad V adapter on your Sinar, or any other 45 camera with a Graflok back, then you can attach any digital back, from any manufacturer, that fits a Hasselbld V camera. The Linhof plate lists for $720.00 and camera stores usually discont from this price.
This shot of a phase one Flex Adapter was done with a 22 MP phase one back and 75mm Grandagon N 4.5. The crop shows detail at the pixel level.
I've only used the H25, so I can only speak of my hands on experience with phase one products. In terms of hardware I think most of the backs are about the same. They all seem to use Kodak or Dalsa CCD's. I do like capture one but one could use C1 with other products. You just have to purchase a license, but its free if your using phase one.
Phase made a portable version called the P25, and a long exposure portable version is the P25+. All of these are 9 micron pitch kodak sensors. 9 Microns is just about the grain lump size for slide film and is about where the best LF lenses resolve.
They are amazing at low ISO and are said to do better for long exposures than the earlier Dalsa chips. If your style of photography includes low ISO with the use of long exposures then your choices are older backs with Kodak CCDs and the new DALSA chips (Iq 2XX series. $$$$). If you want to use a high ISO then I think you need one with a DALSA chip to keep the quality up.
By the way Bob... What is the smallest pixel pitch that you recommend for the non HR Apo Sironar Digital lenses? Is the 150mm a 6/4 design? The shorter ones looked to be a modified Apo Grandagon and the longer ones modified Apo-Sironar-S's? As I understand it they are optimized for larger apertures and smaller, sharper image circles.
Ok thank you all for the help. We've talked about digital backs and how to mount them on a P2 the question is if those backs could be used with the sinar digital lenses directly or aditional hardware is required? I have a sinaron digital 55mm; 135 mm and 105mm. They have a note on them but I think it's for marketing, it says must use with a Sinar tricolor shutter to avoid vignetting.
What shutters are you using and how are they connected to the digital back?
I have only used a digital back with lenses mounted in copal shutters. My back had a cable that connects the back to the flash sync on the shutter. Flash is then connected to a sync port on the back. The whole thing is triggered by a standard cable release. I also used it with the T function for long exposures. This back required two shots to be fired in a row, one to wake the back and a second to capture the image.
I later purchased a "one shot" cable that would wake the back and capture at the same time. This single part connected to the back and released the manual shutter and carried the flash sync timing to the back from the shutter.
Earlier Sinar DB lenses were meant for use with a behind the lens mechanical shutter. Later digital systems used an electronic in- front of the lens shutter. It sounds like the digital lenses are incompatible with the mechanical system due to vignetting. The electronic shutter is meant to connect to a computer and tethered back so it doesn't sound like it will work for you.
You can send those lenses to Sinar or Linos to mount in a new copal shutter. Some will say that you can do this yourself but I think that it requires special equipment to make sure everything is optimized (shimmed) correctly. You can also look for lenses that are already in a copal shutter. Like I said I got good results from a simple grandagon N and 22 MP back. Of course the Apo Sironar Digital is a top notch lens and an upgrade over LF lenses for digital purposes.
There are some other electronic shutters out there but I don't know much about them.
I'm using the Sinar Copal behind-the lens-shutter with my digital backs. Using "newer" Sinar DB lenses and also barrel lenses mounted on Sinar boards. In the latter case the shutter aperture control is not used of course. Using WS or iris from the lens. I've been successful mounting lenses mounted in standard Copal shutters into the corresponding Sinar DB boards. Except for the Copal 3S ... there's no corresponding Sinar DB board for it.
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