@millighost,

Quote - Apart from the fact that poser's cameras seemingly do not want to be dependent on any master parameter (see one of the BB's postings above), i have never had any success in using dependent parameters if the master parameter is a rotation generated by a PointAt. If this worked somehow (with some trickery probably, if at all) it would be very useful far beyond this camera application.

I don't know what caused BB's problem. In my stereo cameras I used traditional deltAdd ERC rather than the new keyed type. I also slaved the focal channel of Camera_B directly to the focal channel of Camera_A, without any intervening valueParm channel. It may be that camera parameters do not like being slaved to valueParm channels, but that's just a maybe. What ever, all my ERC seems to work in PP2012 (SR2.1). I don't know if it will work in other versions, but I see no obvious reason why it should not. As to 'Point At', there is no way (that I know of) to to use data from a rotation generated via Point At as input for ERC. You should be able to control the strength of Point At via ERC, but that's all. However I'm unsure of why or how you want to use ERC with Point at. What are you trying to achieve? If you can describe what the goal is, there may be a way. I was working on a version that supports "toe in", I kind of put it on the shelf when mikeihde said he did not need it, but if there is any interest I can dust it off and try to finish it.