昨天做梦梦到我的40D ＥＲＲ９９了。。。然后在梦里，关机，拿电池，重新开机，检查相机，一系列的动作都是在梦中进行的，也没醒来。。。然后就到早上了。。。
问一问，这个梦没有什么特殊含义吧，我最近一直都没用相机的，更不会日有所思。。。

哈哈

放下佳能 入NIKON 就解决啦

同祝～ XD

呵呵

买个快门预备着

如果梦想成真，那LZ的梦是乌鸦梦。

Key point: Error 99 is a catch-all which can mean almost anything went wrong.

我太坏了，第一个反射到脑袋里面的词是：梦想成真……
我的5D用了很久了，目前还没发现什么问题，反光板也还没掉过。
所以楼主也不必担心的吧，相机可能有问题，但是只有遇到问题的时候才是问题。

Canon's Error 99: the Man, the Myth
bit of Err99 experience.
firmware.
Err99 started with Canon XT and 20D cameras.
There are a lot more. Almost all of them are true for at least some cases of Err99. The best myth, though, is that Canon purposely created error 99 to prevent the use of third party lenses. As best I can tell, that one isn’t really true, but it does make fun speculation. And, of course, Canon’s nearly total silence on error 99 and other problems certainly helps feed the conspiracy theorists among us.
A Brief History of Error 99
Canon no longer officially comments on Err codes, but if we go back to the golden days when they did, we can unravel a lot of the Err99 mystery almost immediately. Back in 2000 Canon released its first mainstream DSLR, the 3.1 megapixel D30. The manual contained a helpful list of the camera’s built in error codes:
ERR 09: System Error. This error occurs when the EOS D30’s self-checking system processing time has exceeded the specified limit.
ERR 22: CF DRIVER. Data cannot be written to the CF card for some reason or another.
ERR 23: NO SPACE LEFT ON THE CF CARD. Space remaining is smaller than needed to complete the write operation.
ERR 50: CF FORMAT. The CF card cannot be formatted in the camera.
ERR 51: PLAY MODE. The CF card cannot be played back in the camera.
ERR 80: SHUTTER. The shutter operation sequence has not been completed correctly.
ERR 81: MIRROR. Mirror up/down status cannot be detected during shutter release.
ERR 82: STROBE. The built-in flash cannot be charged.
ERR 83: POP UP. The built-in flash’s pop-up operation cannot be detected.
ERR 84: LENS COMMMUNICATION. Electronic communication with the lens cannot be established, or the aperture diaphragm cannot be controlled.
In 2002, the D60 was released. It had a reduced set of error codes:
ERR 01: LENS COMMMUNICATION. Electronic communication with the lens cannot be established, or the aperture diaphragm cannot be controlled.
ERR 02: CF DRIVER. Data cannot be written to the CF card.
ERR 04: NO SPACE LEFT ON THE CF CARD. Space remaining is smaller than needed to complete the write operation.
ERR 05: POP UP. The built-in flash’s pop-up operation cannot be detected.
ERR 99: SYSTEM ERROR. There is an internal malfunction detected during the camera’s self-checking procedure which is executed before every attempted exposure.
Key point: Error 99 is a catch-all which can mean almost anything went wrong.
As far as we can tell, the Canon error codes have remained the same through the 50D and 5DMkII camera bodies, at least nominally. The more recent bodies have added an Err 06 code for ‘sensor cleaning unit malfunction’, and there are now ERR 10, 20, 30, 40 . . . 80 codes on 5D Mk II cameras (with the useful message ‘Shooting is not possible’. Duh!). Also some more recent manuals now define ERR99 as “an error other than one of the above (ERR1-ERR06)” has occurred. The only semi-official statement from Canon in recent years is one from Chuck Westfall in TheDigitalJournalist saying “[ERR99] is a non-specific error code which can be caused by a wide range of malfunctions. … a variety of problems can be caused by the use of non-Canon accessories such as lenses, memory cards, battery packs, electronic flash units, etc.”
The second change is less clearly established. Some sources state that lenses with IS systems have higher electric current transmitted from the camera than other lenses do, which makes sense, considering that they have more work to do. In-lens image stabilization first appeared in 1995 with slight improvements in 1997 and 1999. A major improvement was made in 2001 with the faster IS system used in the 70-200 f/2.8L IS and again in 2006 with the new four-stop system in the 70-200 f/4L IS. The newest IS systems are more powerful and stabilize more quickly (0.5 seconds as opposed to 1 second with older systems), so it’s logical to assume they draw more current across the connections, although this is not documented anywhere that I can find.
Several lenses with newer IS, including the 70-300mm f/4-5.6 IS (2005), EF-S 17-55mm f/2.8 IS (2006), and 70-200mm f/4L IS (2006) became very popular with photographers shooting EF-S mount cameras. We know that malfunctions in some of these lenses, most commonly reported with the 17-55 f/2.8 IS, cause ERR99 (and not ERR01) on EF-S mount cameras. Cleaning the electronic contacts on the camera and lens will often fix, or at least improve the problem. There are a few reports that the problem is more common with original Digital Rebel and 20D cameras, and less common with newer cameras; our data supports this too. Some knowledgeable people have speculated that there was a change in contact alloy, a thinner layer of gold plating, or other electrical contact issues with the XT and 20D cameras that make it more difficult for these cameras to deliver the required current to the newer IS lenses. On the other hand, the problem may simply be more common with older cameras because the lens contacts are more likely to be worn.
In-Camera Voltage Drops
Another theory that has some factual basis was reported several years ago on DPReview. A tester found that Canon 20D cameras would display ERR99 if the camera voltage fell below 7.3 volts. The BP511 battery used in all prosumer cameras prior to the 5DMkII should deliver a bit over 8 volts in fully charged state, but will fail to deliver sufficient voltage in certain conditions: dirty contacts, failure of a cell within the battery, age, rapid power consumption, or some combination of the above. This certainly would explain the ERR99 problems occurring with bad batteries or bad battery contacts. Again, just speculating, but I would suggest that a fall in voltage across just part of the camera circuitry would also cause ERR99— for example, across dirty or corroded electrical contacts, across a cracked ribbon cable, or perhaps a slightly corroded circuit board connector. I’ll come back to this idea later.
Common Causes of ERR 99
I’m listing these in my own perceived order of frequency, combining our experience at LensRentals with reading countless online ERR 99 reports. The list has been revised after further information from Precision Camera about actual causes they see during repair. One important thing they reminded me of: when we see ERR99 on the screen, the camera actually has more information about the cause of the error internally. A repair shop can read this information from the camera and often determine the cause with complete accuracy.
Lens/camera electrical contact failure
Lens circuit (AF or IS) failure
Camera electronic circuit failure (see below)
Battery or Grip problems
Broken or stuck lens aperture diaphragm – Note: this most often happens only when the lens is completely stopped down. If you have questions about the lens, shoot it both wide open and stopped down. If ERR99 appears when stopped down, its an aperture issue.
Older third-party lens with incompatible electronics
Jammed or damaged camera shutter curtain
Mis-formatted or damaged card
Damaged or corroded cell within camera battery
Failure of the sequence motor—according to precision this is unusual, but does occur, especially in older cameras that have been through a shutter replacement.
Corroded battery or camera contacts
Incorrectly mounted battery grip, particularly if it’s too loose
Camera/hot shoe electrical contact failure
Moisture condensation within camera or lens (or corrosion occurring days or weeks after moisture exposure)
Most of us cannot define in-camera circuitry failure more specifically than “it went to Canon for repair”, but a few skillful individuals have disassembled their ERR99 frozen cameras and reported things like loosened solder splats that were causing shorts, ribbon cables not firmly seated in their connectors, loose metal shields in the camera that could move enough to short or ground an electrical part, etc. If you’ve never seen the insides of a digital SLR, there are an amazing amount of electronic connections packed into basically no space in there.
Experience at LensRentals.com
There are a number of “what to do when ERR 99 occurs” lists that I’ve summarized below. Before we jump to them, though, I think its important to try to narrow down the ERR 99’s cause, rather than to go through the list and hope everything is better. I realize “finding the problem” sounds remarkably obvious, but bear with me for a second. With hundreds of lenses mounted to hundreds of different cameras at any one time, we deal with a lot of ERR 99 problems. Some ERR 99 issues are specific and immediate: suddenly the camera starts giving ERR99 with almost every shot. Resetting the electronics helps for a few shots— or doesn’t— but the problem recurs and the camera is basically useless. These “catastrophic” ERR 99 episodes usually means there’s been a major injury in the camera or lens: shutter failure, circuitry burnout, etc. Sometimes the fix is easy— new battery, smoothing a jammed shutter curtain, changing lenses, etc.— but most often a trip back to the mothership for either the camera or the lens is in order.
Other ERR 99 problems are more subtle: ERR 99 shows up after a lens change, lets say. Cleaning the contacts makes it go away, but it comes back a week later, getting more frequent over time. It may just be with one lens at first, but may start occurring with other lenses. In these cases I think it important to remember the point about electrical voltage made above: if voltage drops below 7.3V in the camera’s circuitry, ERR 99 is likely to occur. Voltage drops across different connectors are cumulative, and batteries produce less voltage as current increases. What may seem a case of dirty contacts may really be a narrow power margin, due to oil on the lens contacts, an old battery that’s not producing its rated voltage when fully charged, a lens that’s sucking down power to run the IS servos, which finally drops below the lower operating threshold when autofocus is activated. Cleaning the lens contacts might help, but that doesn’t make it “the problem”. So, be careful when diagnosing an intermittent problem. Its also important to do everything you can to narrow down the problem. Sending the camera to Canon for “intermittent ERR99” without more information is likely to lead to “can’t reproduce problem” at the Canon Service Center.
For example, once or twice a month we’ll have a customer tell us “the lens is causing ERR 99 on my camera, none of my other lenses do that”, so we send them a replacement. We have the luxury most individuals don’t get in that situation: the ability to test that lens on multiple cameras, plus the customer will try another copy of the same lens on their camera. In some cases, the customer will tell us the second lens is the same as the first on their camera; meanwhile, the first lens seems fine when tested on other bodies. Here, the problem is a weakness in the customer’s camera body that became apparent only when a lens with heavier power requirements was used. In other cases, the second lens works fine for the customer and the first lens, when returned, gives ERR 99 on other bodies. Again, problem obvious, the lens had internal damage to the electronics or aperture system.
In a lot of cases though, the problem is less obvious. The new lens works fine for the customer, the old one seems to work well on other bodies. At first, we just shrugged our shoulders and said “one of those things” but over time, as we track the problems that occur with various copies of lenses and cameras, something became apparent to us. Unless we found the specific cause of ERR 99 and corrected it then the problem, while intermittent, would recur. We’ve worked on developing an ERR 99 stress test for lenses that only show the problem intermittently: we use an older camera body, halfway charged battery, and take up to several hundred shots being sure to change the aperture, zoom, and focal distance frequently. Doing this we’re sometimes able to reproduce the problem in a lens that otherwise seems to have just had some isolated ERR 99 reports.
That being said, there are also circumstances where ERR 99 has occurred and then never, ever happened again:
Using older battery (solved after replacing battery)
Bad CF card (solved after replacing card)
After marked temperature change (solved after letting the camera sit for a day or so, probably condensation)
After mounting battery grip (solved after remounting the battery grip)
With single lens only, all other lenses fine (solved by repairing the lens)
Early copies of 50D (solved after firmware update)
Camera used with third party shoe mounted flash (solved after flash removed)
Dirty contacts (solved by cleaning, sometimes that is the only problem)
For no apparent reason, it went away for good after doing the routine ERR 99 protocol. This part reminds me of “any sufficiently advanced technology is indistinguishable from magic”…
The LensRentals Error 99 Process
This is based on Canon’s technical support suggestions, with a couple of additions we’ve made as we gained experience.
First, we pull a “tech support” reboot.
Turn camera off.
Remove battery.
Replace battery.
Turn camera on.
Try a shot.
Sometimes that works. If not then a full reboot:
Turn off the camera.
Remove the lens, battery, date-time battery (see below), and CF card.
Allow the camera to sit without power for approximately 20 minutes with the power switch “on”. Recharge the battery during this time. (Full disclosure here: somebody once suggested the 20 minutes and power switch on part, we want to top off the battery anyway, and we’ve generally got other stuff to do so we do it this way. Waiting 30 seconds and using a different, fully charged battery would probably be just as good, but this is what we do.)
Turn off the camera, replace the backup battery, insert the fully charged battery, turn on the camera.

Press the shutter button to check for ERR 99.
If ERR 99 occurs, remove the battery, examine and clean the battery and camera connections. If at all possible, try a different battery.
If ERR 99 still occurs, use the manual sensor cleaning function to raise the mirror and open the shutter. If the shutter does not completely open, it is the source of the problem. If a leaf is out of alignment, some people have reported using a soft brush to move the shutter leaf back into place.
Finally, check the lens:
Turn the camera back off.
Gently clean the contacts on both the lens and the camera (see Note #2 below)
Remount the problem lens, set to manual focus, IS off, widest aperture and take a picture.
If no ERR 99 with everything off, activate autofocus, then IS, then stop the aperture down, taking a picture to confirm no ERR 99 after each step.
If ERR 99 occurs, try a different lens. If only one lens is a problem, that lens needs servicing. You’ll get better service results when you can be specific: i.e. “ERR 99 only when IS activated, etc.” in your service request.
If ERR 99 occurs with more than one lens, and no other cause is apparent, the camera needs to head to Canon for repair.
Note #1: Some ERR 99 problems occur only with the camera in certain settings: i.e only in Av mode, or only in AI servo. In these cases, repair is almost certainly needed.
Note #2: I know first-hand that Canon Service Techs use the “gently rubbing a clean pencil eraser” technique of cleaning the electrical contacts. I also know that knowledgeable electronic engineers state this is a bad idea, that the friction could wear out the gold plating on the electronic connections, leading to corrosion. Radio shack and other electronics stores sell electrical contact cleaning solution that can be used with a Q-tip or soft cloth to clean the contacts as an alternative. I’m still using the eraser; I figure if rubbing metal contacts across each other every time I change a lens isn’t wearing out the coating, the pencil eraser sure isn’t.
End Game
LensRentals.com

40D的进来飘过。

无须多虑，梦都是反的

我也是用40D。。。。。。

所谓的患得患失就这样吧！

我的40D 1w8快门呢，没事。有个朋友的5w+了，也没事。

机身又不算贵，放心用着吧~

要是哪天你最贵的镜头摔地上把镜片摔碎了才要真哭去了

还好还好~我40D 快门1w3了 还没有问题

祝您梦想成真！

………………………………