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#11
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Image stabilization shoud be stabilized
In article , PeterN
wrote: Normally I leave VR turned on and turn it off when I need to (and remember . I think in the future I shall leave it turned off. leave it on and learn how it works. Your advice differs from that of professions wildlife photographers. first of all, he said nothing about wildlife. stabilized lenses are very useful in far more situations than just wildlife. second, it might be different from one wildlife photographer, but certainly not all of them. It is a well known that stabilization only serves to slow down the autofocus speed at shutter speeds above 1/500 of a second/ I shoot birds in flight at at least twice that speed. it's not well known at all, since it doesn't do that. stabilization *helps* autofocus speed because what the autofocus sensors see is not constantly jumping around, one moment on the bird and the next moment off the bird. with stabilization, you can keep the viewfinder on the bird, under the selected focus point (unless you're using tracking focus, which is useful in some situations). the issue he describes, using stabilization with shutter speeds over 1/500th, has to do with the stabilizer sampling frequency, which i already mentioned. it does not affect autofocus. http://www.evergladesphotosociety.org/articles/flightpart01.html Of course you are free to do as you wish. as is everyone. |
#12
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Image stabilization shoud be stabilized
On 8/17/2013 9:23 PM, nospam wrote:
In article , PeterN wrote: Themaker told me that all the birson this website were shot with IS off. Yes, a tripod was usedfor many of them, but others were hand held. why buy a stabilized lens if you're not going to use the stabilization? for appropriate times, such as low light shots when longer exposures are needed. If you have doubts, Google is your friend. There is also a discussion of this in DPreview. shooting birds with a stabilized lens is much easier because you can keep the bird where you want in the frame, since the stabilization stabilizes what you see in the viewfinder. this also helps autofocus and exposure too. VR off: https://dl.dropboxusercontent.com/u/97242118/hummer%20flying1.jpg VR off: https://dl.dropboxusercontent.com/u/97242118/osprey%20about%20to%20land.jpg VR off: https://dl.dropboxusercontent.com/u/97242118/anhinga%20the%20next%20buildeer.jpg VR onL https://dl.dropboxusercontent.com/u/97242118/It%27s%20Mine.jpg Do you see the pattern. those with in-camera stabilization don't get this benefit because the viewfinder is not stabilized, only the sensor. otherwise, it's hard to keep it steady, especially at longer focal lengths. See above. do some esearch. Do as you wish. I letr my results do the talking. -- PeterN |
#13
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Image stabilization shoud be stabilized
On 8/17/2013 9:23 PM, nospam wrote:
In article , PeterN wrote: Normally I leave VR turned on and turn it off when I need to (and remember . I think in the future I shall leave it turned off. leave it on and learn how it works. Your advice differs from that of professions wildlife photographers. first of all, he said nothing about wildlife. stabilized lenses are very useful in far more situations than just wildlife. second, it might be different from one wildlife photographer, but certainly not all of them. It is a well known that stabilization only serves to slow down the autofocus speed at shutter speeds above 1/500 of a second/ I shoot birds in flight at at least twice that speed. it's not well known at all, since it doesn't do that. stabilization *helps* autofocus speed because what the autofocus sensors see is not constantly jumping around, one moment on the bird and the next moment off the bird. with stabilization, you can keep the viewfinder on the bird, under the selected focus point (unless you're using tracking focus, which is useful in some situations). the issue he describes, using stabilization with shutter speeds over 1/500th, has to do with the stabilizer sampling frequency, which i already mentioned. it does not affect autofocus. http://www.evergladesphotosociety.org/articles/flightpart01.html Of course you are free to do as you wish. as is everyone. Stop shifting. The core issue is that stabilization does not help an image at high shutter speeds. In fact it hurts the image for reasons stated in the article. You are opining agianst the weight of authority on this issue. -- PeterN |
#14
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Image stabilization shoud be stabilized
On Sat, 17 Aug 2013 21:23:20 -0400, nospam
wrote: In article , PeterN wrote: Themaker told me that all the birson this website were shot with IS off. Yes, a tripod was usedfor many of them, but others were hand held. why buy a stabilized lens if you're not going to use the stabilization? I buy stabilised lenses because I can't get the lens I want without stabilisation. shooting birds with a stabilized lens is much easier because you can keep the bird where you want in the frame, since the stabilization stabilizes what you see in the viewfinder. this also helps autofocus and exposure too. those with in-camera stabilization don't get this benefit because the viewfinder is not stabilized, only the sensor. otherwise, it's hard to keep it steady, especially at longer focal lengths. -- Regards, Eric Stevens |
#15
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Image stabilization shoud be stabilized
On Sat, 17 Aug 2013 21:23:22 -0400, nospam
wrote: In article , PeterN wrote: Normally I leave VR turned on and turn it off when I need to (and remember . I think in the future I shall leave it turned off. leave it on and learn how it works. Your advice differs from that of professions wildlife photographers. first of all, he said nothing about wildlife. stabilized lenses are very useful in far more situations than just wildlife. second, it might be different from one wildlife photographer, but certainly not all of them. It is a well known that stabilization only serves to slow down the autofocus speed at shutter speeds above 1/500 of a second/ I shoot birds in flight at at least twice that speed. it's not well known at all, since it doesn't do that. stabilization *helps* autofocus speed because what the autofocus sensors see is not constantly jumping around, one moment on the bird and the next moment off the bird. with stabilization, you can keep the viewfinder on the bird, under the selected focus point (unless you're using tracking focus, which is useful in some situations). the issue he describes, using stabilization with shutter speeds over 1/500th, has to do with the stabilizer sampling frequency, which i already mentioned. it does not affect autofocus. http://www.evergladesphotosociety.org/articles/flightpart01.html Of course you are free to do as you wish. as is everyone. You are confusing autofocus as a process with focus as it affects sharpness of the image. What good is is getting a fast autofocus if the image is moving on the sensor at the time of exposure? -- Regards, Eric Stevens |
#16
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Image stabilization shoud be stabilized
In article , PeterN
wrote: It is a well known that stabilization only serves to slow down the autofocus speed at shutter speeds above 1/500 of a second/ I shoot birds in flight at at least twice that speed. it's not well known at all, since it doesn't do that. stabilization *helps* autofocus speed because what the autofocus sensors see is not constantly jumping around, one moment on the bird and the next moment off the bird. with stabilization, you can keep the viewfinder on the bird, under the selected focus point (unless you're using tracking focus, which is useful in some situations). the issue he describes, using stabilization with shutter speeds over 1/500th, has to do with the stabilizer sampling frequency, which i already mentioned. it does not affect autofocus. http://www.evergladesphotosociety.org/articles/flightpart01.html Of course you are free to do as you wish. as is everyone. Stop shifting. i'm not shifting anything. The core issue is that stabilization does not help an image at high shutter speeds. In fact it hurts the image for reasons stated in the article. nope. it *can* hurt the image because of the stabilization sampling frequency versus the shutter speed, but it doesn't always hurt the image. it also has nothing whatsoever to do with affecting autofocus. You are opining agianst the weight of authority on this issue. not at all. i understand how the technology works. there can be an issue at higher shutter speeds, but *not* for the reasons he claims. he is mistaken as to why. even someone unfamiliar with how stabilization actually works would realize that the autofocus and stabilization systems are independent. if anything, a stabilized view *helps* the autofocus system because the subject is not moving around the frame as much. |
#17
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Image stabilization shoud be stabilized
In article , PeterN
wrote: Themaker told me that all the birson this website were shot with IS off. Yes, a tripod was usedfor many of them, but others were hand held. why buy a stabilized lens if you're not going to use the stabilization? for appropriate times, such as low light shots when longer exposures are needed. If you have doubts, Google is your friend. There is also a discussion of this in DPreview. http://improvephotography.com/743/ti...otography-anim al-bird-digital/ Bird Photography Tip #10: Donąt skimp on Image Stabilization. It is unfortunate that image stabilized lenses often come at a premium, because some photographers opt for the cheaper lens without image stabilization. *Especially for telephoto lenses, your image stabilization will be absolutely vital to the success of your photography of birds in flight. http://photographylife.com/how-to-photograph-birds The best bird photographers in the world will tell you that they cannot live without their 500mm and 600mm lenses, preferably with optical stabilization + teleconverters. shooting birds with a stabilized lens is much easier because you can keep the bird where you want in the frame, since the stabilization stabilizes what you see in the viewfinder. this also helps autofocus and exposure too. VR off: https://dl.dropboxusercontent.com/u/97242118/hummer%20flying1.jpg VR off: https://dl.dropboxusercontent.com/u/97242118/osprey%20about%20to%20land.jpg VR off: https://dl.dropboxusercontent.com/u/...ext%20buildeer. jpg VR onL https://dl.dropboxusercontent.com/u/97242118/It%27s%20Mine.jpg Do you see the pattern. that's the farthest thing from a controlled test possible. those with in-camera stabilization don't get this benefit because the viewfinder is not stabilized, only the sensor. otherwise, it's hard to keep it steady, especially at longer focal lengths. See above. do some esearch. i have. now take your own advice. Do as you wish. I letr my results do the talking. your results are meaningless. they're not a controlled test of anything. |
#18
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Image stabilization shoud be stabilized
In article , Eric Stevens
wrote: You are confusing autofocus as a process with focus as it affects sharpness of the image. What good is is getting a fast autofocus if the image is moving on the sensor at the time of exposure? exactly why you want stabilization! note that there is a panning mode, where you can pan to follow a subject and it stabilizes the up/down direction. this can be quite useful for birds in flight but less useful for one perched on a branch. |
#19
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Image stabilization shoud be stabilized
On Sat, 17 Aug 2013 22:31:05 -0400, nospam
wrote: In article , Eric Stevens wrote: You are confusing autofocus as a process with focus as it affects sharpness of the image. What good is is getting a fast autofocus if the image is moving on the sensor at the time of exposure? exactly why you want stabilization! note that there is a panning mode, where you can pan to follow a subject and it stabilizes the up/down direction. this can be quite useful for birds in flight but less useful for one perched on a branch. You are up to your old trick of evading my meaning. Let's try again: You are confusing autofocus as a process with focus as it affects sharpness of the image. What good is image stabilisation assisting you get a fast autofocus if image stabilisation leads to the image moving on the sensor at the time of exposure? -- Regards, Eric Stevens |
#20
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Image stabilization shoud be stabilized
In article , Eric Stevens
wrote: You are confusing autofocus as a process with focus as it affects sharpness of the image. What good is is getting a fast autofocus if the image is moving on the sensor at the time of exposure? exactly why you want stabilization! note that there is a panning mode, where you can pan to follow a subject and it stabilizes the up/down direction. this can be quite useful for birds in flight but less useful for one perched on a branch. You are up to your old trick of evading my meaning. Let's try again: You are confusing autofocus as a process with focus as it affects sharpness of the image. What good is image stabilisation assisting you get a fast autofocus if image stabilisation leads to the image moving on the sensor at the time of exposure? i'm not evading anything, nor is it 'my old trick'. image stabilization is leads to the image *not* moving on the sensor. that's the whole point! it also helps autofocus attain focus since the focus points are on the same parts of the subject. however, like everything, stabilization has its limits and using it outside of those limits can potentially be worse (but not always). one such limit is high shutter speeds, and that's not due to autofocus issues. |
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