11-02-2012, 10:11 PM
Since when are Angle of View and Field of View not the same?
http://en.wikipedia.org/wiki/Angle_of_view
"In photography, angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view." <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />
Anyway... as you see from my samples, the Angle of view gets more narrow when focussing closer with my Canon EF 70-200mm f4 L USM. Same will be the case with the Nikon AF-S 70-200mm f4 VR, as its published specs predict. Not too surprising, seeing just how smilar most of the lens's construction is.
The f2.8 VR II has a very clear angle of view widening. That is why people complain about its focus breathing.
Anyway... focal length and Angle of View are not linked 1:1. When the focal length stays the same at different focus distances, the Angle of view (Field of view) will change (get more narrow). This means that what you said earlier, about lenses for film, will have to change focal length to keep the same angel of view/field of view. And this then means, if those lenses have no focus breathing, that focus breathing is about keeping the same field of view/angle of view through their focus range, and that it is not about the focal length figure of the optics.
http://en.wikipedia.org/wiki/Angle_of_view
"In photography, angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view." <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />
Anyway... as you see from my samples, the Angle of view gets more narrow when focussing closer with my Canon EF 70-200mm f4 L USM. Same will be the case with the Nikon AF-S 70-200mm f4 VR, as its published specs predict. Not too surprising, seeing just how smilar most of the lens's construction is.
The f2.8 VR II has a very clear angle of view widening. That is why people complain about its focus breathing.
Anyway... focal length and Angle of View are not linked 1:1. When the focal length stays the same at different focus distances, the Angle of view (Field of view) will change (get more narrow). This means that what you said earlier, about lenses for film, will have to change focal length to keep the same angel of view/field of view. And this then means, if those lenses have no focus breathing, that focus breathing is about keeping the same field of view/angle of view through their focus range, and that it is not about the focal length figure of the optics.