Cleaning Your SLR

Sensor Versus Mirror

I’ve written several times on the blog about cameras, sensor dust, and cleaning your SLR.  You can review those here, here, and here (5 Ways to Clean, 5 Times to Clean, and 5 Ways to Avoid Dust).  I’ve also elaborated a bit on the various options for cleaning your SLR from the no-contact to the wet and dry methods, but I’ve never really addressed the fundamentals behind camera dust in question.  So, when someone asked recently on Quora about the Self-Cleaning Mechanisms in SLR’s, I figured a more complete write-up might help.  This was posed on Quora recently, and in the interests of sharing the points I made there to any of the reading audience here, figured it’d be worth inclusion.  So, without further ado – here’s the full skinny on SLR’s and self-cleaning:

The Self-Cleaning Mechanism

Dust Delete

The self-cleaning mechanism of SLR’s has many larger concepts that need to be addressed to fully understand what is happening, but in basic principle, a camera will use the battery to either shake or vibrate the dust off, or, it will negatively charge air particles that will attract the dust off the sensor and let the now airborne dust fall down to the dust trap at the bottom of the sensor.  Having said that, there’s a couple additional points to make in this question that can help:

Sensor Cleaning Versus Mirror Cleaning

Sensor Versus Mirror

The internal self-cleaning addresses the sensor itself, whereas DIY cleaning methods really are addressing the mirror that reflects an image onto the actual sensor.  Unless you want to lock the mirror up (such as on older cameras) and clean the actual sensor, any cleaning efforts you do on newer cameras is really only addressing the mirror.  Because of that, the internal sensor cleaning will address the sensor cleaning adequately, but does not address the mirror in the SLR  (until of course the dust trap fills up and needs to be emptied by an authorized professional from Canon, Nikon, or other third party).  When it comes to cleaning the mirror, you will have to do that yourself.

Is the dust really being removed?

While the self-cleaning function does “remove” dust from the sensor, through either vibration (or shaking), it’s not really removing the dust from the camera.  Here is where the larger question of “where does it go” remains unanswered for the most part, and also where the usefulness of the feature sort of falls flat.  Inside cameras that have this feature, there is a dust trap at the bottom of the sensor that catches dust when it is shaken off the sensor and/or sensor mirror.  Simple laws of physics suggest that eventually this trap will get filled, which means it needs to be emptied, or you need to send a camera in for cleaning.

Preventive Maintenance

While I have personally found that the self-cleaning feature is useful to a degree, the fact that dust is not being removed entirely from the camera detracts from its value, as well as the consideration that difficult or stubborn dust is not removed sort of devalues the benefits in the long term.  Instead, incorporate a system when using your camera to avoid introducing dust in the first place, such as some of those mentioned already, including, but not limited to:

1.  Keeping the camera pointed down when changing lenses
2.  Using a changing bag
3.  Turn the camera off before removing a lens
4.  Change a lens as quickly as you’re able – the longer the face is open the more chance of additional dust being introduced.
5.  Keep your camera clean and try to change lenses in less dusty situations (i.e. not in the middle of a sandstorm)

DIY Mirror Cleaning

There are several methods of dust removal you can use such as the use of a Rocket Blower (also use with the camera pointed down), mirror wipes, lens pens, and other similar products.  These are often categorized as no-contact and contact cleaners.  Within the contact cleaners, there are also sub-categories:  wet and dry cleaners.

No Contact Cleaners
No contact cleaners (blowers) use a puff of air to dislodge dust from the mirror and when used properly, the dust will fall out of the camera entirely. A great product in this category is the Giottos Rocket Blower.

Giottos Rocket Blower

Contact Cleaners – Wet Versus Dry
Dry cleaners generally refer to the brushes like Lens Pens that act like a paintbrush of sorts that sweeps dust off the mirror.  Conversely, the wet cleaners use a pad and a liquid that is swiped across the mirror to swab the dust off with a quick drying agent (usually some form of an alcohol) – the one I’ve used is a combo of Eclipse solution and PecPads.  Both of these often come with increased risk of damaging your camera, so I would only recommend these for those comfortable with the mechanics of cameras in general.  The dry cleaners are less likely to damage, but still carry some risk, so keep these in mind in your cleaning approaches.


I’d also be interested in hearing what others think of the “Self-Cleaning” SLR’s…do you use this feature?  Do you find it useful? Do you clean your own camera, and if So, how often? Feel free to sound off in the comments below!

Live from the Road: Episode #55

Northern Lights Poster

Northern Lights Poster

Over the weekend I had the distinct pleasure of joining my colleague and good friend Kerry Garrison (who you probably know from Camera Dojo) out “in the wild” as we traveled to the Breezy Point Resort north of Brainerd MN (about three hours west and north if the twin cities) and spoke at their Northern Lights conference.  Through the coordination of our sponsor, Nations Photo Lab, and the conference hosts, MNNPA, we had a wonderful time.  Not only did the coordinators treat us like Rock Stars (we did give some autographs though), the attendees were quite engaging too.

The pre-conference sessions were set to start at 12, and our gig started at 5.  After a few of the logistical things were addressed that always come up with hosting conferences (they even had a live wedding going on one room next to us – what a great opportunity for a bride to get a wide range of photographers applying their trade), we got rolling.  A mere five minutes into our introduction, we paused to add even more tables and chairs to the room as more and more people started filing in.  For a regional conference to have a crowd this big during a pre-conference tech talk was quite surprising, but also very enjoyable.  So, what did we talk about?

The topic was none other than Lightroom 3!  We talked about how to navigate around, some of the benefits and tips and tricks of LR to soon realize that we are very fortunate to be in the position that we are.  It was humbling to realize that we really are on the cutting edge as so many people are using Lightroom 1, LR 2, or even earlier generations of Photoshop for their workflow.  Our discussion quickly was adapted to both demonstrate why and answer questions on what makes Lightroom 3 such a useful tool for both established and emerging photographers.

The questions raised were just wonderful ranging from very broad-ranging ones like “Why should wedding and portrait photographers care about upgrading their work flow?” to ones as detailed as “Can Lightroom manage PSD files?” and “How can I keyword photos during import?”  By the time our two hour segment was up we had barely covered the import process, a little bit on the adjustment brush, and the nuts and bolts of things like cropping, selective color, and black and white conversions.

Ours was the last segment for the day and we were then invited to the after party over in one of the adjoining houses.  Food snacks, drinks and such were all available and in abundance.  With the abundance of spirits, everyone was in great spirits themselves as we laughed and talked further with lots of people about photography stuff until the wee hours of the morning.  By 1am we were done though and needed to head back to our respective cities (myself to Denver and Kerry to Anaheim, CA).  So, during our road trip back to Minneapolis for the return flight, we decided to record this show for you.  Answers to all the questions above and more are here, as well as a few photo opp stops!  Thanks for taking the time to listen, hope you enjoy it and we’ll be back again soon with more photo goodness!

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Learn more about the Northern Lights Conference and MNPPA here: