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<blockquote data-quote="D200freak" data-source="post: 540320" data-attributes="member: 41018">Not every project turns out quite as planned.My replacement aperture control assemby arrived.&nbsp; &nbsp; I took the D810 apart and installed it,&nbsp; which requires partial disassembly of the mirror box assembly. When I got it back together,&nbsp; the aperture control was working properly.&nbsp; Success!&nbsp; But the mirror mechanism was not working right, and I realized that I'd reassembled it the wrong way.&nbsp; It can only be assembled in two ways,&nbsp; one right and one wrong.&nbsp;&nbsp; Even though I had been through this before, I assembled it the wrong way.&nbsp; So I went back inside it,&nbsp; rebuilt the mirror assembly the correct way,&nbsp; put the camera back together, and the mirror works fine.&nbsp;&nbsp; But the aperture control problem was back!&nbsp; I've had the camera apart three or four times today since then,&nbsp; trying to find out if I'd reassembled something incorrectly or messed something up. Mechanically it's fine,&nbsp; but either the motor or the position sensors have gone nuts. I'm done with it for now.&nbsp; I MAY just buy yet another complete new aperture control assembly and try again.&nbsp; &nbsp; But for now,&nbsp; the heck with it.&nbsp; I'll just use it with the 200-500 all the time, which has an electronic aperture,&nbsp; and use my D800 for every other lens I have.&nbsp; &nbsp;&nbsp; Problem (kind of) solved. It frustrates me to put extra work into it and KNOW that if I'd just reassembled the mirror box correctly the first time,&nbsp; the camera would be 100 percent almost without a doubt.</blockquote>

[QUOTE="D200freak, post: 540320, member: 41018"] Not every project turns out quite as planned. My replacement aperture control assemby arrived. I took the D810 apart and installed it, which requires partial disassembly of the mirror box assembly. When I got it back together, the aperture control was working properly. Success! But the mirror mechanism was not working right, and I realized that I'd reassembled it the wrong way. It can only be assembled in two ways, one right and one wrong. Even though I had been through this before, I assembled it the wrong way. So I went back inside it, rebuilt the mirror assembly the correct way, put the camera back together, and the mirror works fine. But the aperture control problem was back! I've had the camera apart three or four times today since then, trying to find out if I'd reassembled something incorrectly or messed something up. Mechanically it's fine, but either the motor or the position sensors have gone nuts. I'm done with it for now. I MAY just buy yet another complete new aperture control assembly and try again. But for now, the heck with it. I'll just use it with the 200-500 all the time, which has an electronic aperture, and use my D800 for every other lens I have. Problem (kind of) solved. It frustrates me to put extra work into it and KNOW that if I'd just reassembled the mirror box correctly the first time, the camera would be 100 percent almost without a doubt. [/QUOTE]

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