Originally Posted by scottatl
One thing does not make sense about blending to me. The sharpest part of the CRT is the center. With blend you are putting two sides in the center forcing the least sharp part of the picture to be right dab in the most important part of the film.
Yes, it is more commonly known that the center of CRT is the sharpest. And in most cases it is because most CRT's do not have good focus out to the edges.
There's two reasons for this. One is the design of the set itself, and the other is the lenses that were being used.
Blending is sort of new to me. Most of my A/V experience was dealing with Edge Matching. Which is another way to bring images together (non seamless).
In the higher end simulation/blend systems of today, the lenses used on the Marquee's, G90 and Barco 1209 would not be "simulation/blend rated" lenses. And that's where the HFQ900 came into existence. They are special lenses designed for this purpose. It's more of a solid lens design, which is known to be both expensive and would be very different from the multi-element lens designs of past.
The HFQ900 are very linear, with almost no optical aberrations out to the edges of the image. Which makes for the perfect lens for simulation, Blending and high end HT systems.
I'm now in the blend camp. Servicing and maintaining close to a dozen simulation/blend systems along the central east coast. From time to time, I get to meet up with others who design and also service these setups.
Learning about the HFQ's and why there's a 1400x1050 resolution being used in most of them is interesting. Though most of the immersive (stereoscopic) blend setups use 1280x1024 @96hz.
With blending, it is very important to use the right resolution/aspect, which would produce the perfect 4:3 pattern for each projected image.