Originally posted by Winder Where does it say that it only works for one focal length? A lens can be design for a flat focal plane, then it can be designed for a curved on as well.
While the news release doesn't mention it, a friend of mine who did optical design for JPL had this to say about the curved sensor.
"Re: curved sensor
The radius of curvature of the focal plane of a telescope is (usually, that is, without specific field flattener elements) directly proportional to the telescope's focal length. Although the formula differs for refractor versus newtonian versus cassegrain, etc., it's almost always a multiple of the focal length. For a Newtonian, its exactly the focal length. For a refractor, it's a fraction of the focal length depending on the index of refraction of the glasses. What I'm getting at, is that depending on your telescope type and its focal length, you need a different curvature of the sensor. So either this new sensor is going to be good only for a single focal length (per telescope type), or they have to produce MANY different curvatures (unlikely to be affordable to do that).
Interesting concept, but I can't see how it would work practically."