02-05-2013, 03:11 PM
[quote name='Brightcolours' timestamp='1360076452' post='21785']
It would be crazy to make a 560mm for only APS-C, as the lens will not be much smaller/lighter/cheaper fot APS-C than for FF... Tele lenses do not shrink much. The "DA" would suggest APS-C, but there are other DA lenses which cover FF.
(...)
[/quote]
I presume this lens covers the 24x36 image circle. The problem is rather that this kind of long-focus lens (it is definitely not a telephoto lens: its length + flange distance equals its focal length), deriving from a telescope formula, usually suffers from poor borders; in such case the APS-C format would be the "sweet spot" of the lens.
It would be crazy to make a 560mm for only APS-C, as the lens will not be much smaller/lighter/cheaper fot APS-C than for FF... Tele lenses do not shrink much. The "DA" would suggest APS-C, but there are other DA lenses which cover FF.
(...)
[/quote]
I presume this lens covers the 24x36 image circle. The problem is rather that this kind of long-focus lens (it is definitely not a telephoto lens: its length + flange distance equals its focal length), deriving from a telescope formula, usually suffers from poor borders; in such case the APS-C format would be the "sweet spot" of the lens.