without adjustments, Poser mimics a normal digital camera. So 35mm focal length equals the good old 50mm from analog camaras. So, somewhere between 20mm - 15mm the fisheye effects will kick in (and vice versa, 100mm digital = 150mm analog is great for portraits).

One fun adjustment is to change the camera size, by scaling. Scaling up increases the distance between the lens opening and the capturing back plane and hence has the inverse effect of increasing the focal length (scale 200% and you need 70mm for the same result as scale 100% at 35mm). But there are differences, as the larger focal length will flatten the image and will effect Depth of Field (focal blur), independant of the camera size.

In other words, it works like in the real world.

Enjoy

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though