John_F wrote:
A nice long list of helpful commentary on the lens cleaning thread prompts me to move a step beyond. While I alway keep a neutral UV filter on my lens to keep off the dust, I have no defense when changing one lens for another. Of course, some have a camera body for each lens, but not everyone does. One solution (probably not 100%) is to switch lenses under a 'hood' or inside a car, there is always a risk that nearly invisible dust gets inside the camera. Blowing breath in to dislodge bring moisture into the picture, so what alternatives for getting that nearly invisible dust are there? One might be compressed air spray cans, but these are not air but some compressed gas. What are the risks with them and do they do the job well? So when changing lenses, my heart is always up in my throat. Ideas anyone.
A nice long list of helpful commentary on the lens... (
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First of all, never changing lenses is not a defense against getting dust in your camera. (1) some dust is left in during the manufacturing process; (2) some dust is created by movement of mechanical parts (mirror, shutter); (3) lenses are not airtight and need to adjust to atmospheric pressure changes, so air is always moving into or out of the camera, possibly carrying dust with it. In fact, since you have to change the volume of air in your camera when you focus your lens, that's another source of air movement in/out.
Cleaning your lenses is a fact of life: everyone is familiar with that. Cleaning your sensor is also a fact of life, whether you change your lenses or not. Most people are reluctant to do it themselves, since the sensors cost a significant fraction of the camera and replacement incurs additional labor costs (and is something you really can't do yourself). I was in that boat and didn't clean my sensor for a couple years, until I got a new camera body. Eventually it got some visible dust on the sensor and I decided it needed to be cleaned. Since I had an old camera body, I tried it on that first. It was so easy I went right ahead and cleaned the D3 sensor. Took about 10-15 minutes. I now do it myself whenever it is needed.
I use a Rocket Blower and pec pads with Eclipse fluid.
I bring up a blank page on my word processor so I have a white screen. I then turn off autofocus, set the lens to a small aperture, and take a shot of the screen from a couple inches away. Nothing's in focus, so there's no structure in the image except for the dust. Look at the image and see what the dust pattern looks like. Using the computer like that allows you to do this all at your desk, without going outside to take a picture of a clear sky, it allows you to do it in partly cloudy weather, or at night. You don't have to have an uncluttered wall to take a picture of. You can do it all sitting at your desk and it takes much less time and it's a consistent light source.
Next, take the rocket blower, give it a few squeezes to blow out any dust that accumulated in the nozzle (I store it in the package so that should minimize any dust there). Then take the lens off and blow out the mirror box. Then raise the mirror and blow off the sensor. Note that your camera should have a mirror-up setting. Use that instead of the bulb or time exposure setting because it turns off the power to the sensor, so there's no static charge there to attract dust. Put the lens back on and repeat the dust checking step above. If there's still some dust, try it again. I do this three times before moving to a wet cleaning.
If the wet cleaning is necessary, I take the moistened swab and run it one way across the sensor, then the other way. That uses both sides of the swab. I have never had to use more than 3 swabs.