Originally posted by Francis I've now scratched my sensor, darnit
Hi
How did you manage to do that?
I have cleaned dozens of sensors over the years and have not even come close to do that.
You say you used the sensor swab, dry or wet ? These sensors are quite tough little buggers, I am at a total loss how you managed to scratch it. If they are that easy to ruin no service center would be willing to work on them, let me assure you.
On the other hand I am not willing to accept that you actually produced a scratch but have merely left a smear behind, which is very easy to do if the speck of crap was some sort of organic matter. Under the magnifier the can look very much like a scratch!
Edit
I have removed a number of smears that presented for all the world as scratches.
First let me explain why you get smears. Smears are created when you try to shift organic dirt in a linear motion. The smear is the result solely because the crap is nothing else but a piece of organic matter that contains some moisture on its own or it has absorbed moisture from the cleaning medium during the cleaning process. And because you only put very little cleaning fluid on the swab there is just enough moisture there to partially dissolve the matter. Either way the material is soft enough to leave a trail of its matter behind, it rubs off so to speak. The surprising thing is that the majority of crap that finds itself deposited on the sensor actually is organic. If it is dry fluff it is much easier removed.
Because these smears are hard to clean off most people that have created one during the cleaning process immediately identify them as scratches.
How do you then remove them ?
Here is what I do with a 100% success rate. Get some Cleaning fluid. I use 98% pure Ethanol from the Chemist but if you feel unsure about Ethanol use the fluid that came with the kit. Now get a lintfree cotton bud and soak it well in the fluid. Get your fresh sensor swab ready and apply a small amount of fluid here also.
Now locate the smear on the sensor and with you left hand gently dab the well soaked bud over the smear and hold it there for a moment, hold the swab in your right hand in readiness to wipe the smear as soon as you have removed the cotton bud. Dabbing the smear will dissolve it in readiness for the the swab in your right hand to gently wipe it away. Discard the swab and repeat this process until everything is clean. I find soaking the smear first before wiping with the swab is the only way to tackle this. The little bit of fluid on the swab is not enough on its own to remove smears particularly if they are of a greasy nature. Working with both hands this way is important because the cleaning fluid evaporates very quickly and you dont want to give the smear time to dry out again before wiping it. Also you should not overload the full width swap with too much liquid but with the overloaded small more direct bud there is no chance to of damage by flooding the sensor.
If working with both hands is a bit challenging for you, by all means use on hand, but practice you action on a CD/DVD first, you'll find it is dead easy.
Last edited by Schraubstock; 08-31-2011 at 04:38 AM.
Reason: Additional explanation