Originally posted by interested_observer I made the "lens-based system is better for longer focal lengths" comment, essentially based on the moment arm effect. For a unit of movement with the sensor, there is a much larger movement in longer focal lengths when compared to the shorter focal lengths. That said, since I like wider angle lenses, I still see and perceive value in using SR or stabilization in the shorter lengths. Logically you need to move the sensor more to compensate for a movement change in a short focal length - however, with the shorter focal lengths, you should not be seeing a large set of movement change in the scene, in that it is closer. So it all works out. When I was designing a star tracking system for a telescope, and Pentax's floating sensor is similar but not as complex, the lever arm or moment arm effect really comes in to play - especially when you have a minimum focusing distance of the Moon.
Lowell - I was typing before my morning coffee - which is always dangerous. I intended to just say
stabilization systems - not lens-based. My fault for not reading the reply closely enough before hitting [send]. I agree with you, and that is why I bought into Pentax in the first place. By the way - excellent image! Tomorrow morning it will be open mouth, insert coffee cup.....
Last edited by interested_observer; 12-14-2011 at 07:58 PM.