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NIKON 180MM 2.8 ED AI-S LENS not metering correctly in Aperture mode.
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<blockquote data-quote="downunder" data-source="post: 370981" data-attributes="member: 29516"><p>What I find strange is that the lens was only with the technician from the Nikon Service Centre for a couple of minutes and the receptionist reported that the technician had said something about ball bearings coming loose and falling out. That to me would mean he accessed the internal workings of the lens and specifically the internal diaphragm mechanism within the lens in about 2 minutes. I am sure experts can do things fast but that seemed very fast to me. I just undid the 5 screws at the back of the lens and that took me a few minutes. I found that the little spring that connects the aperture lever to the lens was stretched to the point where it had no strength to move the aperture lever. My understanding is that when a photo is taken on a closed down aperture setting on the lens that the aperture first opens fully wide and then shuts down to the set aperture when taking the photo as the spring pulls back the aperture lever to close it down. I found that I could move the ring the aperture lever is on and freely open the aperture fully and then close it down to the set aperture manually with my hand with no resistance at all. The bad state of this little spring makes me believe that it has something to do with the aperture on this lens failing to stop down to the set aperture from fully open as the last step in taking the photo. This is what was happening with this lens - it was only partially stopping back down when a photo was taken leading to overexposure. Am I being cynical about the explanation provided by the technician? Maybe it is a sticky diaphragm that caused the spring to lose its strength and maybe technicians have ways of getting to a aperture mechanism very quickly but it would take someone with more expertese that me to tell if that is the case.</p></blockquote><p></p>
[QUOTE="downunder, post: 370981, member: 29516"] What I find strange is that the lens was only with the technician from the Nikon Service Centre for a couple of minutes and the receptionist reported that the technician had said something about ball bearings coming loose and falling out. That to me would mean he accessed the internal workings of the lens and specifically the internal diaphragm mechanism within the lens in about 2 minutes. I am sure experts can do things fast but that seemed very fast to me. I just undid the 5 screws at the back of the lens and that took me a few minutes. I found that the little spring that connects the aperture lever to the lens was stretched to the point where it had no strength to move the aperture lever. My understanding is that when a photo is taken on a closed down aperture setting on the lens that the aperture first opens fully wide and then shuts down to the set aperture when taking the photo as the spring pulls back the aperture lever to close it down. I found that I could move the ring the aperture lever is on and freely open the aperture fully and then close it down to the set aperture manually with my hand with no resistance at all. The bad state of this little spring makes me believe that it has something to do with the aperture on this lens failing to stop down to the set aperture from fully open as the last step in taking the photo. This is what was happening with this lens - it was only partially stopping back down when a photo was taken leading to overexposure. Am I being cynical about the explanation provided by the technician? Maybe it is a sticky diaphragm that caused the spring to lose its strength and maybe technicians have ways of getting to a aperture mechanism very quickly but it would take someone with more expertese that me to tell if that is the case. [/QUOTE]
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NIKON 180MM 2.8 ED AI-S LENS not metering correctly in Aperture mode.
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