Marc,
I will try to answer, if you don't mind.
- the SB 54M or 54 MC (cooled) is a 22 Mpx digital back which can be used only tethered (Kodak sensor), without display.
- the Sinarback eMotion 54 LV (or previously eMotion 22) is a different and newer generation of back, with a 22 Mpx sensor from Dalsa, with a display and controls on the back. This eMotion backs can be used un-tethered and tethered, they have an internal hard-state memory of 4 GB, as well as a slot for the use with CF cards. They work with a battery giving an autonomy of 2.5 to 3 hours shooting. As such, this cannot be compared with the SB 54 M/MC.
- the previous eMotion 22 was using the same sensor as the current eMotion 54 LV: it has been discontinued and replaced by the eMotion 54 LV, with Live Video capability and with a new electronic board. The ISO range was effectively from 25 to 200 with the eMotion 22, and is from ISO 50 to 400 with the eMotion 54 LV.
- the eMotion is capable of good ISO 400: I guess Graham has already published some sample files elsewhere, if I am right.
I hope this helps and clarifies.
Best regards,
Thierry
How does the e54LV differ from the new 54MC? I assume they are both tethered backs ... which isn't what I need for the 203FE ... which brings me to the eMotion22. But your file shows what the 22 meg back produces @ ISO 50, so that helped.
However, when I look at the specs of the eMotion22 on the SinarBron site, it lists it as offering ISO 25 to 200. This simply won't cut it for mobile use with the 203FE ... I need at least a GOOD ISO of 400 ( and ISO 800 would be helpful) to keep the shutter speed up.
This pushes me into the eMotion75 ... and now we're into some real money ... LOL.
Also, I am still paranoid about the Sinar working on the 203 when FE lenses are used. I know the CF lenses will work, the 203 will also work with a Hasselblad CF back ... but only with CF lenses mounted and in the leaf shutter mode.