Diane, assuming that Poser follows optical laws (& I do know that it does) you should make your adjustments at whatever the "standard" lens turns out to be. Then use the appropriate focal length for whatever you are after. Of course, this will also produce the usual distortions of the different fl's. The interesting thing about Poser is that because you can morph, etc you are in a position that the photographer would envy. Effectively, you are able to produce a pic containing the extreme distortions of a fish-eye wide angle lens in the background while keeping perfectly normal proportions for your subject. Yes, it's extra work but can produce highly effective & startling results.