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#21
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"VR" Nikon lenses
Floyd L. Davidson wrote:
Wolfgang Weisselberg wrote: Floyd L. Davidson wrote: The main point though was that the OP asked for 400mm or more, so I didn't go into 300mm examples, of which there are many that would need to be included if the specification were 300mm and longer. So why not a good 300mm f/4 or faster non-zoom (or a terrific xx-300mm zoom --- don't ask me if such a thing really exists) and a good 1.4x teleconverter? That's also 400mm and might be worth the price. (A 2x has a strong impact on the image quality, but a 1.4x usually works out OK.) I assume the OP wants a 400mm f/4 or faster non-zoom and a good 1.4x teleconverter. That *is* what he said he wants. And I believe he'd be advised that IS or VR is "a good thing" for that type of shooting. -- john mcwilliams |
#22
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"VR" Nikon lenses
John McWilliams wrote:
Floyd L. Davidson wrote: Wolfgang Weisselberg wrote: Floyd L. Davidson wrote: The main point though was that the OP asked for 400mm or more, so I didn't go into 300mm examples, of which there are many that would need to be included if the specification were 300mm and longer. So why not a good 300mm f/4 or faster non-zoom (or a terrific xx-300mm zoom --- don't ask me if such a thing really exists) and a good 1.4x teleconverter? That's also 400mm and might be worth the price. (A 2x has a strong impact on the image quality, but a 1.4x usually works out OK.) I assume the OP wants a 400mm f/4 or faster non-zoom and a good 1.4x teleconverter. That *is* what he said he wants. And I believe he'd be advised that IS or VR is "a good thing" for that type of shooting. Yes and no. It depends on the exact circumstances. Certainly a 400mm lens can be handheld, and in that case VR is just extremely usefull. I don't see it as of much value with an 800mm lens though, in particular if it has a teleconverter on it too. That simply requires a steady support system, such as a tripod w/gimbal mount. -- Floyd L. Davidson http://www.apaflo.com/floyd_davidson Ukpeagvik (Barrow, Alaska) |
#23
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"VR" Nikon lenses
On Tue, 22 Sep 2009 15:25:23 -0700, John McWilliams
wrote: Floyd L. Davidson wrote: Wolfgang Weisselberg wrote: Floyd L. Davidson wrote: The main point though was that the OP asked for 400mm or more, so I didn't go into 300mm examples, of which there are many that would need to be included if the specification were 300mm and longer. So why not a good 300mm f/4 or faster non-zoom (or a terrific xx-300mm zoom --- don't ask me if such a thing really exists) and a good 1.4x teleconverter? That's also 400mm and might be worth the price. (A 2x has a strong impact on the image quality, but a 1.4x usually works out OK.) I assume the OP wants a 400mm f/4 or faster non-zoom and a good 1.4x teleconverter. That *is* what he said he wants. And I believe he'd be advised that IS or VR is "a good thing" for that type of shooting. Can the VR mechanism in the lens be adjusted for the addition of a 1.4x teleconverter? If not, adding any teleconverter will change the angular corrections needed, making the VR much more less effective by under-correcting. This is why there are always these menu options on super-zoom P&S cameras. To let the camera know when more or less (in the case of wide-angle adapters) motion correction is needed to properly correct for camera shake. Without this teleconverter multiplier feedback to the optical VR mechanism calculations it becomes fairly pointless to add any optics in the light path and expect for similar shake-correction performance. |
#24
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"VR" Nikon lenses
jerry blaine wrote:
Can the VR mechanism in the lens be adjusted for the addition of a 1.4x teleconverter? It doesn't need to, it's lens based and --- from the viewpoint of the lens --- nothing changes. The teleconverter is not in front of the lens, but behind it (and the VR, so really nothing changes for the VR), so if the lens delivers a steady image, the TC will enlarge a steady image resulting in a steady, enlarged image on the sensor. This is why there are always these menu options on super-zoom P&S cameras. To let the camera know when more or less (in the case of wide-angle adapters) motion correction is needed to properly correct for camera shake. These converters are in front of the lens (strike one), so the VR must counteract more than usual. And then many of these cameras shift the sensor (strike two), so even a TC behind the lens would force the sensor to counteract more than usual. -Wolfgang |
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