Tut mir leid, für die kleine Verspätung, aber die Email lag noch auf meinem alten Rechner. Hier die Email von Bill Maxwell:
Lorenz,
Here is some information while we determine what needs to be done for your 617 back. My HI-LUX Ultra Brilliant Matte screen will look really beautiful in your 4x5 Chamonix and Dayi 617 back, as well as being much, much brighter and easier to focus. Here is some information concerning your 4x5 Chamonix while we determine what needs to be done for your Dayi 617 back.
My HI-LUX Ultra Brilliant Matte focus screen is the brightest focus screen available for 4x5 cameras. It has an extremely bright, very fine grain, very high optical contrast, very high clarity focusing surface that allows composing and focusing in very dim light or with very slow viewing apertures. This screen is intended to give the easiest focusing and viewing possible in all kinds of light conditions, especially dim light. This screen would provide truly superior performance for your 4x5 Chamonix. The price is $500.00.
Available (a) without lines; (b) with 1/2 inch (12.7mm) grid lines - $15.00; (c) with 1 inch (25.4mm) grid lines - $15.00; (d) the Rule of Thirds lines - $15.00.
My screens are modern "one piece" screens, which are made of high quality, optical grade plastic, with the brilliant focus surface on the lens side of the screen and the ultra fine groove pitch, high clarity fresnel on the back side (so focus is not affected). There is a clear cover glass on the back side to protect the screen and insure optical flatness.
My HI-LUX Ultra Brilliant Matte screen is up to 50 times brighter, (compared to a standard ground glass without fresnel) with much, much better distribution of light across the screen, with much higher optical contrast and much higher clarity. This screen allows composing and focusing in light conditions where you would have difficulty reading (before dawn, after dusk, deep under the forest canopy, night shots, macro, dimly lit interiors, dimly lit interior portraits, very slow viewing apertures, etc). This screen is very easy to focus.
PLEASE NOTE: I am currently in the process of changing the company that does the precision molding of the starting component which I use to create my HI-LUX Ultra Brilliant Matte focus screen. As such, there will be a delay in my ability to supply this screen while awaiting the first batch of materials (possibly up to 6 weeks). I feel the wait will be worth be it since I believe the result will be a truly superior product going forward. I can place you on a waiting list to be notified as soon as these materials arrive.