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#11
August 17th 04, 03:38 PM
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BandHPhoto wrote:
Internal focus. Means the lens doesn't change size, I believe. Not important for anything I can think of. It also means the front element doesn't rotate during focus, which is a REAL boon if you're using a pol filter. But that need not be achieved with internal focus. rear focus gives the same. - -- regards, Henry Posner/B&H Photo-Video http://www.bhphotovideo.com -- Sander +++ Out of cheese error +++ 
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#12
August 17th 04, 05:13 PM
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"Sander Vesik" wrote in message
... BandHPhoto wrote: Internal focus. Means the lens doesn't change size, I believe. Not important for anything I can think of. It also means the front element doesn't rotate during focus, which is a REAL boon if you're using a pol filter. But that need not be achieved with internal focus. rear focus gives the same. Or in the case of the 80-200 AF-D, the lens housing is extended beyond the last element, which rotates inside the housing, allowing one to fix filters to the lens housing, free of the last element, as it were. Sort of a pseudo-internal focus. Danged thing vignettes, though. -- Regards, Matt Clara www.mattclara.com
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#13
September 3rd 04, 03:25 PM
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Matt Clara wrote:
"Sander Vesik" wrote in message ... BandHPhoto wrote: Internal focus. Means the lens doesn't change size, I believe. Not important for anything I can think of. It also means the front element doesn't rotate during focus, which is a REAL boon if you're using a pol filter. But that need not be achieved with internal focus. rear focus gives the same. Or in the case of the 80-200 AF-D, the lens housing is extended beyond the last element, which rotates inside the housing, allowing one to fix filters to the lens housing, free of the last element, as it were. Sort of a pseudo-internal focus. Danged thing vignettes, though. i think this is called helical focus (hf) sometimes. its by far less reliable construction than the other two. -- Sander +++ Out of cheese error +++
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#14
September 3rd 04, 03:25 PM
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Matt Clara wrote:
"Sander Vesik" wrote in message ... BandHPhoto wrote: Internal focus. Means the lens doesn't change size, I believe. Not important for anything I can think of. It also means the front element doesn't rotate during focus, which is a REAL boon if you're using a pol filter. But that need not be achieved with internal focus. rear focus gives the same. Or in the case of the 80-200 AF-D, the lens housing is extended beyond the last element, which rotates inside the housing, allowing one to fix filters to the lens housing, free of the last element, as it were. Sort of a pseudo-internal focus. Danged thing vignettes, though. i think this is called helical focus (hf) sometimes. its by far less reliable construction than the other two. -- Sander +++ Out of cheese error +++
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