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#21
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Bill Hilton wrote:
Two other things worth mentioning ... the Canyon trails are usually dusty (unless it just rained or snowed) and if you have to change lenses a lot you'll probably have dust on the sensor pretty quick, so a zoom with a wider focal range means you'll have to change the lens less often, which is good. This dust problem is one of the curses of digital. Something of note that came up in the rec.photo.digital newsgroup is that some zooms can actually pump air (and dust). For example, I tested my 100-400 L IS and it really pumps a lot of air with the push-pull zoom design. So which is better: a zoom constantly pumping air and dust into the camera, or fixed sealed lenses that you change occasionally? On a recent trip to Alaska, I used mostly fixed lenses, but constantly changed lenses and telextenders. I never had one dust spec appear on my over 5,000 images. I use a method that minimizes possible dust: I remove the rear lens cap of the lens going on, and hold it in one hand. The camera is hanging from my neck or on a tripod so I don't have to handle it. As I remove the lens on the camera, I slide the new lens into place, exposing the inside for only a couple of seconds. I do get dust, but it seems rare, every few thousand images. For big lenses, like the 500 f/4 which is on the tripod, I remove the lens caps for the telextender, remove the camera and quickly slide the TC into place, then put the TC+camera on the big lens. Some people recommend turning off the camera to change lenses, but I really do not see the need as the sensor is behind the shutter. The concern is dust gets into the camera during a lens change, then during an exposure, dust gets on the sensor because mirror slap and the shutter stirs up the dust. Roger |
#22
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Bill Hilton wrote:
Two other things worth mentioning ... the Canyon trails are usually dusty (unless it just rained or snowed) and if you have to change lenses a lot you'll probably have dust on the sensor pretty quick, so a zoom with a wider focal range means you'll have to change the lens less often, which is good. This dust problem is one of the curses of digital. Something of note that came up in the rec.photo.digital newsgroup is that some zooms can actually pump air (and dust). For example, I tested my 100-400 L IS and it really pumps a lot of air with the push-pull zoom design. So which is better: a zoom constantly pumping air and dust into the camera, or fixed sealed lenses that you change occasionally? On a recent trip to Alaska, I used mostly fixed lenses, but constantly changed lenses and telextenders. I never had one dust spec appear on my over 5,000 images. I use a method that minimizes possible dust: I remove the rear lens cap of the lens going on, and hold it in one hand. The camera is hanging from my neck or on a tripod so I don't have to handle it. As I remove the lens on the camera, I slide the new lens into place, exposing the inside for only a couple of seconds. I do get dust, but it seems rare, every few thousand images. For big lenses, like the 500 f/4 which is on the tripod, I remove the lens caps for the telextender, remove the camera and quickly slide the TC into place, then put the TC+camera on the big lens. Some people recommend turning off the camera to change lenses, but I really do not see the need as the sensor is behind the shutter. The concern is dust gets into the camera during a lens change, then during an exposure, dust gets on the sensor because mirror slap and the shutter stirs up the dust. Roger |
#23
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Bill Hilton wrote:
Two other things worth mentioning ... the Canyon trails are usually dusty (unless it just rained or snowed) and if you have to change lenses a lot you'll probably have dust on the sensor pretty quick, so a zoom with a wider focal range means you'll have to change the lens less often, which is good. This dust problem is one of the curses of digital. Something of note that came up in the rec.photo.digital newsgroup is that some zooms can actually pump air (and dust). For example, I tested my 100-400 L IS and it really pumps a lot of air with the push-pull zoom design. So which is better: a zoom constantly pumping air and dust into the camera, or fixed sealed lenses that you change occasionally? On a recent trip to Alaska, I used mostly fixed lenses, but constantly changed lenses and telextenders. I never had one dust spec appear on my over 5,000 images. I use a method that minimizes possible dust: I remove the rear lens cap of the lens going on, and hold it in one hand. The camera is hanging from my neck or on a tripod so I don't have to handle it. As I remove the lens on the camera, I slide the new lens into place, exposing the inside for only a couple of seconds. I do get dust, but it seems rare, every few thousand images. For big lenses, like the 500 f/4 which is on the tripod, I remove the lens caps for the telextender, remove the camera and quickly slide the TC into place, then put the TC+camera on the big lens. Some people recommend turning off the camera to change lenses, but I really do not see the need as the sensor is behind the shutter. The concern is dust gets into the camera during a lens change, then during an exposure, dust gets on the sensor because mirror slap and the shutter stirs up the dust. Roger |
#24
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Bill Hilton wrote:
Two other things worth mentioning ... the Canyon trails are usually dusty (unless it just rained or snowed) and if you have to change lenses a lot you'll probably have dust on the sensor pretty quick, so a zoom with a wider focal range means you'll have to change the lens less often, which is good. This dust problem is one of the curses of digital. Something of note that came up in the rec.photo.digital newsgroup is that some zooms can actually pump air (and dust). For example, I tested my 100-400 L IS and it really pumps a lot of air with the push-pull zoom design. So which is better: a zoom constantly pumping air and dust into the camera, or fixed sealed lenses that you change occasionally? On a recent trip to Alaska, I used mostly fixed lenses, but constantly changed lenses and telextenders. I never had one dust spec appear on my over 5,000 images. I use a method that minimizes possible dust: I remove the rear lens cap of the lens going on, and hold it in one hand. The camera is hanging from my neck or on a tripod so I don't have to handle it. As I remove the lens on the camera, I slide the new lens into place, exposing the inside for only a couple of seconds. I do get dust, but it seems rare, every few thousand images. For big lenses, like the 500 f/4 which is on the tripod, I remove the lens caps for the telextender, remove the camera and quickly slide the TC into place, then put the TC+camera on the big lens. Some people recommend turning off the camera to change lenses, but I really do not see the need as the sensor is behind the shutter. The concern is dust gets into the camera during a lens change, then during an exposure, dust gets on the sensor because mirror slap and the shutter stirs up the dust. Roger |
#25
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Couldn't agree more. Thinking about heading down to the canyon late this
week. All this info couldn't have come at a better time. kwhiner "Martin Djernæs" wrote in message news:0pycd.407260$Fg5.268917@attbi_s53... Bill Hilton wrote: ... As always a fountain of amazing information Bill. We all thank you for the time you spend writing really good answers to people. Martin |
#26
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Couldn't agree more. Thinking about heading down to the canyon late this
week. All this info couldn't have come at a better time. kwhiner "Martin Djernæs" wrote in message news:0pycd.407260$Fg5.268917@attbi_s53... Bill Hilton wrote: ... As always a fountain of amazing information Bill. We all thank you for the time you spend writing really good answers to people. Martin |
#27
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Couldn't agree more. Thinking about heading down to the canyon late this
week. All this info couldn't have come at a better time. kwhiner "Martin Djernæs" wrote in message news:0pycd.407260$Fg5.268917@attbi_s53... Bill Hilton wrote: ... As always a fountain of amazing information Bill. We all thank you for the time you spend writing really good answers to people. Martin |
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