Cracking Open the 7D II

Published November 3, 2014

OK, I have to admit I really like the Canon 7D Mark II. I didn’t want to because it wasn’t what I wanted. I wanted to see the new Canon chip foundry that would be cranking out high-resolution sensors. But despite wanting to hate the 22-megapixel APS-C camera, after a fairly short exposure to the autofocus system, I have to admit I like it. There’s just something about getting every shot in focus every time that’s appealing to me.

However, when I read that Canon claimed the 7D II has “4 times better weather sealing than the original 7D” I went mildly nuts. Most of you know I hate marketing drivel. HATE IT. Most of you know I’m generally not impressed with weather sealing claims. Unless something has changed in the last 30 seconds, weather sealing still means, “the warranty doesn’t cover water damage.”

So when I read the claim “4 times more weather sealing” my inner cynic just thought 4 times zero equals zero. But I wanted to be fair so I decided I’d open up the 7D II before I wrote a scathing article about making ridiculous weather sealing claims. Which results in me once again writing an article where I have to admit my assumptions were wrong less correct than I would have liked. (Sorry, I forgot for a moment this was the internet where no one ever says “I was wrong.”)


The 7D and 7D Mk II looking awfully similar in front view.


For those who want to take my word for it and skip on to some other blog, the Canon 7D Mk II may be the best weather-sealed camera I’ve run across. It’s excellent. For those who would rather see for themselves, gory camera dissection pictures follow!!

I’ll add, because someone always wants to comment about the poor quality of my dissection photos, that you’re welcome to try shooting with one hand while taking two cameras apart with the other hand under 4 tungsten hot-lights, making sure you have the camera back together by the end of your lunch break. We don’t do high-quality product photos back in the repair department. But better this way than if we let the product photo people try to take the cameras apart.

On to Some Dissection

The backs come off the cameras almost identically, but once they are off we start to see some differences.


Backs open on the 7D II (top) and 7D (bottom). The flex to the back assembly is disconnected already on the 7d.


The first thing we noticed were thick, flexible rubber gaskets (red arrows) sealing the back of the 7DII that aren’t there on the 7D.


The side panels (where the accessory connections live) look very similar at first glance.


But only the 7D II has rubber gaskets around the edges.


A Bit of Non-Weather Sealing Stuff

Let’s leave the weather sealing for a second. Looking at the back assemblies shows a minor change most of you won’t care about. If you own a rental shop, though, you really would care about it. There’s been some strong bracing (green lines) placed around the LCD on the 7D Mk II that aren’t there on the 7D (or the 5D series either). One problem with the 7D was that you could push the LCD hard enough with your thumb to make it sink into the camera a couple of millimeters. It required disassembling the back to put the LCD back in place. It’s nice to see the issue addressed even though it was a minor problem. While we’re looking at the back, though, you can see that the 7D II has thick gaskets around the viewfinder (red arrows), which weren’t there on the 7D.


Back assemblies of the 7D II (left) and 7D (right).


If you look at the back of the camera there’s another thick  gasket around the viewfinder, which makes this area doubly sealed!


After removing the shielding from the backs, it’s obvious the chip sets are completely different.


Canon 7D back with shielding removed.


Canon 7D Mk II with shielding removed.


Obviously, the big jumper flex that crosses the circuit board in the 7D is gone with the 7D II. We sort of hated losing that jumper flex in the center of the camera because we thought it was kind of pretty. But the new camera has an exceptionally cool flex in the bottom right corner that Aaron has named the argyle flex. It’s not quite as cool as the jumper flex, but it does somewhat make up for the esthetic loss. OK, camera geek turned off.

The argyle flex


For those among you who intend to double-check our results by disassembling your own 7D II, I will help you out by showing you the location of the official Canon-hidden-circuit-board screw. There’s one of these in every camera, I assume to keep some untrained person like me from removing the PCB.


Before we get back to looking at seals, I’ll show you one other thing I really like. There’s a small fiberoptic cable in the 7D that tends to slip out of its holder on the circuit board (if you take things apart, not from just using the camera).  It’s held by the forceps in the picture below, with the red arrow pointing to it and the small white plastic slot it slides into (and out of).

The 7D Mk II has a much more robust snap-in connector. Another minor, but significant to me, improvement.


Accessory ports soldered to the PCB can be bad, because if they get tugged on enough to break you have bought yourself a new PCB. On the 7D the microphone port was soldered to the PCB (the round one on the left). Because microphone cables tend to get jerked, this was a problem for us. On the 7D II the microphone port is moved off of the PCB and connected to it by a flex.


One more thing about the internals, then we’ll go back to our regularly scheduled programming. A quick glance at the deep boards shows the CF card slot is on its own circuit board (the SD card is part of the main board). This is important because CF pins bend or break sometimes. Having a separate board makes replacement easier when that happens.


This was Supposed to be about Weather Sealing, Wasn’t It?

Oh, yeah. Well, there’s plenty more of that to show you. The bottom plate of the camera has another gasket around the edges.

And there’s even an internal one around the tripod mount. (Just to stop repeating myself, none of these were present in the original 7D.)

The front plate has gaskets around every edge (red arrows).

And on the outside of the camera body plates, under the grips, most of the joints are sealed with waterproof tape.

Of course,  there are gaskets around the top assembly.

Heck, there’s even a gasket around the diopter adjusting knob, something I’ve never seen before.

So there you have it. This is, by dissection at least, the most thoroughly weather-sealed camera I’ve ever run across. (I would point out that I don’t take apart every camera so please don’t change my wording to say it’s the most weather sealed camera. I don’t know that.) But this isn’t just market-speak weather sealing. It’s a thorough and complete attempt to seal every possible crack and crevice the camera has.

And yes, I know what you’re going to ask. Will I stick it under running water and see if it still works? I really think it would be fine. But I’ve already been wrong with one assumption today, so I don’t want to push my luck. Besides, it’s not my camera.

Roger Cicala and Aaron Closz

November, 2014

Author: Roger Cicala

I’m Roger and I am the founder of Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.

Posted in Equipment
  • Carl Garrard

    Use an EF lens then 🙂

  • tom rose

    The camera may well be weather sealed, but I can’t find any weather sealed APS-C lenses in Canon EF-S fit. The very highest performing lenses for APS-C, such as Sigma’s 18-35 f/1.8 and 50-100 f/1.8, are not weather sealed, and Canons’s weather-sealed L-lenses are designed for full frame and few of them have the higher resolving power needed to get the most out of the 7D II’s smaller pixels. I have to ask, why did Canon release a superbly weather-sealed APS-C camera without making some equally well-sealed APS-C lenses? Of course the results are good with most weather-sealed L-lenses, but they are not the most detailed that the camera is capable of.

  • Steven Green

    House is worth about 250K and it’s got a premium of 1500 per year. I have a specifically listed “scheduled” coverage of 13,000 in camera gear and 10,000 of art for a 215 per year.

    Ive used it twice. Once for repairs and this time for gear after mine went diving

    Talk to your agent. You can get renters insurance but home owners get the best

  • Joaquim Gonsalves

    What!!! How much do you pay to Allstate as you monthly/annual premium?

  • Steven Green

    Thanks for the info. I have my water damaged one coming back from Canon NJ as they say they can’t repair it. I’ll have a small guide to open it up with now. And a big thanks to Allstate for buying me a replacement lens and body. Now looking up how to take apart a 400mm f5.6 and give it the big drying..

  • David Hussey

    I have one point with this article that I am having a very hard time swallowing….. I do not for one second believe either of you guys are actually capable of turning your “camera geek” off ….. And thank Gawd for that!

    Thanks Roger and Aaron for this peek inside the 7DII. Makes me feel more comfortable about taking mine out in inclement weather and better helps justify the $$$$ spent ……….. not to say that I haven’t been thrilled with it since I took it our of the box

  • Jack Zhan

    These are probably not DiGiC 6 chips then. It’s highly possible that these Samsung chips are the RAM chips.

  • Steve W

    OK… How good will all this weather-sealing really be if one doesn’t use a weather-sealed lens?

  • Rex Gigout

    This is reassuring. Thanks for taking the time to share this.

  • Asad

    “If you look at the back of the camera there’s another thick gasket around the viewfinder, which makes this area doubly sealed!”

    Well, not really. The outer gasket seals the back plate’s periphery against the viewfinder hump. The inner gasket (attached to the back plate) seals the viewfinder *opening*. There are two seals, but they’re sealing two different water entry points, so it’s still only singly-sealed.

  • Tony Leone

    How does the weather sealing work on the rear panel buttons? I was shooting with mine in the rain a few days ago and wiped it down every chance I got but at the end of the day I could see water between the panel and buttons when I pressed them. Both my 7DII and ID4 are still working but its only been a few days. I also got plenty of water on the extended barrel of my 100-400ii and worked the zoom plenty.

    No need to worry or should I bury it all in jasmine rice for a week?

  • larry lou

    I would like to see you disassemble a PENTAX camera ?K-5 or K-3?and compare its sealing to 7D II? 😕

  • Tania Balzat

    Or the 5D’s for that matter? It must have been hard to take that baby apart.

  • Tania Balzat

    Do you know what the sealing is like on the Canon 1D?

Follow on Feedly