01-27-2013, 07:53 PM
(This post was last modified: 01-27-2013, 08:22 PM by Brightcolours.)
[quote name='mst' timestamp='1359310334' post='21559']
Well, whatever we or video people call it: the 70-200/4 VR does have focus breathing in my book. It changes the AOV considerably during focusing.
Now, the big surprise is, however: unlike on the 70-200/2.8 VR II (and the Sigma 70-200/2.8 OS) the AOV decreases when focusing closer.
[/quote]
It should not have been a surprise to you, <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' /> as I have illustrated the same thing with my 70-200mm f4 L USM (and I have pointed out earlier in this thread that the Nikon 70-200mm f4 VR has similar specs) <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />
http://forum.photozone.de/index.php?/top...__p__20785
All Canon 70-200mm's show a narrowing of the FOV, as do the old Nikon 70-200mm f2.8 VR and the 80-200mm f2.8 (just about all 70/80-200's do, except the Nikon 70-200mm f2.8 VR II and Sigma 70-200mm f2.8 OS, which show a widening of the FOV).
The confusing part is that people think that focal length is 100% linked to FOV, but it is not. If the focal length stays the same when focussing close, the FOV narrows.
Indeed, the focus breaths with the 70-200mm f4 (Canon or Nikon), but not in a negative way for stills photography (you do not lose FOV possibilities). For film/video it still is not desirable (one does not want to have a scene grow or shrink while the lens goes to a focus range).
A reason video lenses are so expensive is because the focal length has to change the right amount in order to have the FOV remain the same through the focus range.
Well, whatever we or video people call it: the 70-200/4 VR does have focus breathing in my book. It changes the AOV considerably during focusing.
Now, the big surprise is, however: unlike on the 70-200/2.8 VR II (and the Sigma 70-200/2.8 OS) the AOV decreases when focusing closer.
[/quote]
It should not have been a surprise to you, <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='
' /> as I have illustrated the same thing with my 70-200mm f4 L USM (and I have pointed out earlier in this thread that the Nikon 70-200mm f4 VR has similar specs) <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='' />http://forum.photozone.de/index.php?/top...__p__20785
All Canon 70-200mm's show a narrowing of the FOV, as do the old Nikon 70-200mm f2.8 VR and the 80-200mm f2.8 (just about all 70/80-200's do, except the Nikon 70-200mm f2.8 VR II and Sigma 70-200mm f2.8 OS, which show a widening of the FOV).
The confusing part is that people think that focal length is 100% linked to FOV, but it is not. If the focal length stays the same when focussing close, the FOV narrows.
Indeed, the focus breaths with the 70-200mm f4 (Canon or Nikon), but not in a negative way for stills photography (you do not lose FOV possibilities). For film/video it still is not desirable (one does not want to have a scene grow or shrink while the lens goes to a focus range).
A reason video lenses are so expensive is because the focal length has to change the right amount in order to have the FOV remain the same through the focus range.