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| Moderated by: chrisbet, | ||
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chrisbet
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Was hunting for an affordable D850 to fix up but even ones with top and front casings smashed were going for best part of £500! But I have just picked up a D810 for £200 - has had the lens mount snapped off but enough of the mirror box front face remains to get a replacement spring and mount correctly aligned. The camera has arrived so I just wait for the spares to turn up. I have black structural methylacrylate glue which will reconstruct the missing parts and secure the mount screws in their holes. If that doesn't work out then I can get a replacement box and have the fun of swapping it all over - full dismantle - I will try and avoid that if I can  Testing with a spare battery shows everything else is OK and it has a 73k shutter count.  Click here to comment on this image. |
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jk
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Hope you can get it back together and working well. Problem is the more pixels the more finicky the set up is. I still have my D810 as backup for my D850 as I got rid of my D600 when I got my Z9. |
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novicius
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What happened,do you know ? |
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chrisbet
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No, I don't know what happened but the damage indicates that the lens was pulled off in an upward direction - the bottom mount screw hole is intact, the two either side are broken halfway down and the top two are completely missing. There is no damage to the outside of the camera so either it fell on the lens or something fell on it. Either way, all the electronics work and once I get the mount reattached I'll see if the lens communicates with the camera OK. Fortunately Nikon made the box with 8mm deep screw holes for a 6mm screw and the mount is another 1 - 2 mm, so the plan is to use 8mm M2 replacement screws which means, at least for the bottom screws they will screw into unbroken plastic for some of the length. The methylacrylate glue is 2 part and incredibly strong - I use it to glue broken plastic car bumpers back together! |
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Eric
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chrisbet wrote:No, I don't know what happened but the damage indicates that the lens was pulled off in an upward direction - the bottom mount screw hole is intact, the two either side are broken halfway down and the top two are completely missing. It must have taken a heck of a whack. Or the D600 mount isn’t as robust. I was photographing a leisure centre some years ago. While waiting for the swimming pool to be cleared of people (to get still water) I went up 2 floors to the gym and was taking photos there, when I got the call…. “still water”. I raced down the stone stairwell with my D3 and 24-70 lens loosely wedged on my bag. Centrifugal force took over as I cornered at speed and the whole combo flew across the landing and smashed against the wall. Bits everywhere.  I scooped up the bits put them in the car and grabbed my back up kit only to find some fat git had ignored the request to stay out of water for 10mins and jumped in. Fortunately his ripples hadn’t reached the deep end so I later photoshopped out him and his tsunami. Took the mess to ACS on my way home and having miraculously saved all the bits, David was able to reassemble the lens while I waited. I actually felt it was a better lens after his rebuild! But the point was……the D3 mount was totally undamaged ( ok the body had a couple of chunks missing) …. the lens seemed to be the crumble zone. |
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chrisbet
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The D810 box is plastic, unlike the D800 / 850 / D3 which are alloy |
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Iain
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I have bashed and dropped my D3 and D4 and they never flickered and just kept on working. Having never had any dealings with a Z9 I don't know how it would compare in a similar situations. |
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novicius
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I remember Eric`s hair raising D3 / 24-70 encounter with said staircase...remembered it vividly when my own D3S tumbled on the wooden kitchen floor with a 24-70 vr on it,luckily nothing happened ( the floor got dented )....I hope that you can fix it, as it sounds do-able. |
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chrisbet
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The mount turned up today and is temporarliy fixed for testing - camera working fine with G type lens but fEE with D types - issue on the aperture ring methinks .... But here is a pic taken with my one and only G lens  Click here to comment on this image. |
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Eric
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chrisbet wrote:The mount turned up today and is temporarliy fixed for testing - camera working fine with G type lens but fEE with D types - issue on the aperture ring methinks .... That looks excellent. Well done. Definitely beyond my skill set.  |
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Eric
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novicius wrote:I remember Eric`s hair raising D3 / 24-70 encounter with said staircase...remembered it vividly when my own D3S tumbled on the wooden kitchen floor with a 24-70 vr on it,luckily nothing happened ( the floor got dented )....I hope that you can fix it, as it sounds do-able. I still wake up in the middle of the night in a cold sweat. |
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chrisbet
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Still waiting on the spring that goes under the mount and three more screws to be fitted but "looking" better! Click here to comment on this image. |
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jk
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chrisbet wrote:The mount turned up today and is temporarliy fixed for testing - camera working fine with G type lens but fEE with D types - issue on the aperture ring methinks .... If you get the FEE error that implies that the little lug on the AFD lens is not engaged. Is that your assumption/assessment as well? I can send you some pictures of the throat of my D810 if that helps. |
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novicius
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Ooh, Well Done !....and now surely the Missus will understand that G-lenses need to be acquired.... |
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chrisbet
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Thanks for the offer JK, my D610 is exactly to same as the D810 in this area - many of the parts are interchangeable. The issue lies much deeper than the tag on the ring - I am a perfectionist when it comes to mechanical things and further (inevitable) dismantling and inspection reveals, as I suspected, a problem with the F-FO base plate module - it has been damaged and needs replacing - already on order from the US!  Click here to comment on this image. |
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jk
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Well done at finding the issue. You should be able to source parts from Nikon UK or an approved repairer. Have you tried ACS in Norfolk? Both Eric and I have used them in the past. Very good service. |
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chrisbet
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Thanks for the suggestion but I have already sourced an original Nikon replacement. Closer inspection of the damage suggests to me now that this wasn't the result of a fall but maybe a jammed lens that someone attempted to remove themselves by inserting a sharp object between lens and camera. There are a few reports on the web about Tamron lenses being prone to loose mount screws that then jam the lens on its mount. |
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Iain
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Eric wrote:That looks excellent. Well done. Definitely beyond my skill set. And mine too. Looks like you will get there Chris. |
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Bob
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chrisbet wrote:Was hunting for an affordable D850 to fix up but even ones with top and front casings smashed were going for best part of £500! You might like to take a look at this: https://www.mdpi.com/1996-1944/16/9/3386 .It's a paper on the material properties of a polycarbonate material |
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chrisbet
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There are plastics and there are plastics ... Nikon says the plastic used in the mirror box is carbon fibre reinforced. The design has its limitations, it may reduce weight and shutter vibrations but the design is flawed, the screws holding the mount in place are short and skinny, the plastic is finely moulded and liable to break if subjected to excessive force. Longer screws threaded into a nut imbedded deeper in the moulding would be better and spread shock forces. Better still would be a front "plate" carrying the mount which could be changed without total disassembly of the entire camera! The magnesium casting of the D800 / 850 and D series is much more robust. Just don't drop D810s! |
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Bob
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chrisbet wrote:There are plastics and there are plastics ... Nikon says the plastic used in the mirror box is carbon fibre reinforced. The whole assembly is most likely the product of many hours of C.A.D. modelling. If Nikon went as far as defining a loading scenario i.e. what would it take to break it - then the results are only as good as the f.e. mathematical model, boundary conditions etc and the material properties used, which is very difficult with grp due to the random orientation of the fibres. So, as you say, the bottom line is - don't drop 'em. |
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chrisbet
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A look inside - Click here to comment on this image. The box mounts are now built up and waiting for 1.8mm drill to drill out the screw holes - screws and F-FO unit on way from Nikon. |
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Eric
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That looks quite spaced out for camera inners. When I changed my D70 low pass filter to IR it was like open heart surgery. I had a photography mate swabbing my brow and standing by with oxygen. Never again. Mind you it was a camera I bought new, so the pressure was on my Thrift Gland not to mess up. lol |
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chrisbet
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99% of the gubbins is crammed in behind and both sides of the mirror box - thankfully it is straightforward to remove the front casing - anything more needs the back and top off and then you start pulling ribbon cables and connectors and I know from my lense fixing escapades that that can lead to issues of broken ribbons which are a sod to fix, |
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Eric
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chrisbet wrote:99% of the gubbins is crammed in behind and both sides of the mirror box - thankfully it is straightforward to remove the front casing - anything more needs the back and top off and then you start pulling ribbon cables and connectors and I know from my lense fixing escapades that that can lead to issues of broken ribbons which are a sod to fix, Ah yes…I went in from the back  I did have one ribbon connector that didn't reseat properly. I had to open her up again to add to the stress. Second time it all worked fine. After a few test frames in the back garden, this was a quick trip to Castle Rising for probably my first IR photo....certainly the oldest surviving!!!  Click here to comment on this image. |
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Eric
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I stand corrected! This is older, number 5, ivy up a factory fence near my mates house ...when I dropped him off after the surgery. 2006! Bl**dy hell 19 years Ive been doing IR. That is scary.  Click here to comment on this image. |
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