Originally Posted by Kelvin1965S
I wouldn't want to be losing too much brightness during the calibration as part of my rational for upgrading from the HD350 is to get higher native brightness and contrast, so I can close down the iris to eek the most out of the new projector. In real world terms I would be hoping to go from maybe 20,000:1 on/off to double that as I'm in a very long throw setup. The (cheaper) Sony isn't really an option for me as I prefer to be able to control the peak white and I could be selling my A-lens to go back to zooming partly due to the Eshift and also the lens memory of the JVC X55.
Your expectations are reasonable if you're at long throw, as long as you have enough brightness to light up your screen. Can you close the iris down fully on the HD315?
I'm mid throw with the rs45, and with a new lamp I can close down the iris to -15 and get 40000:1 and around 17fL if I aim to resolve 235, and 35000:1 and 15.5fL if I aim to resolve up to 255 (after full 125 points 3D Cube LUT, so D65/Rec709).
My screen is a carada BW (real gain 1.1) 88" diag 16/9, throw 3.4m.
The rs48 is a bit less bright than the rs45 (1200 vs 1300 as per the specs) but has the same on/off, which suggests it might have a lower black floor.
We'll soon find out...