01-27-2013, 11:30 AM
[quote name='nuke12' timestamp='1359230821' post='21542']
The Nikon 70-200 f/4 does not focus breath. At least not in the conventional sense that DSLR people use the word. The lens on my D800 shows a focal length of ~ 280mm at MFD. This was measured using the ruler method at MFD, zoom at 200mm and simple trig math. Online calculators generated the effective focal length from the AOV. Video people would consider this breathing because the focal length does change with focus distance.
[/quote]
~280mm?
Video people do not consider focal length change breathing, but field of view change breathing. A lens where the field of view does not change will have a change in focal length (they are not linked the way you think).
The Nikon 70-200 f/4 does not focus breath. At least not in the conventional sense that DSLR people use the word. The lens on my D800 shows a focal length of ~ 280mm at MFD. This was measured using the ruler method at MFD, zoom at 200mm and simple trig math. Online calculators generated the effective focal length from the AOV. Video people would consider this breathing because the focal length does change with focus distance.
[/quote]
~280mm?
Video people do not consider focal length change breathing, but field of view change breathing. A lens where the field of view does not change will have a change in focal length (they are not linked the way you think).