Archived posting to the Leica Users Group, 2003/07/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Remember that with rangefinders, you can have what I call "RF parallax error" at close distances. If you imagine that the RF window, the lens, and the object being photographed make a triangle: rf *\ | --------------- | ---------------------------- *-------------------------------------------* lens object You can see that the lens-object distance will be shorter than the rf-object distance. This is mainly a problem in lens testing, because most of us place that ruler coplanar with the lens. With 3D objects such as faces or brick walls (or peeling paint), this isn't a problem. But it is a problem anytime you try a small object at very close distances. Try putting the object so that it forms an equilateral triangle between the lens and rangefinder. I ran into this when testing my russian lenses against Dante's hypothesis.... Karen Nakamura http://www.photoethnography.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html