Originally posted by John Poitiers Bonjour,
Thanks to everyone for their input to this thread and please I need some sensor cleaning advice for my K-7 ...
About 2 weeks ago I noticed a dust speck "smack-dab" in the middle of my sensor. So the next week (when I had time) I went to my local camera shop and bought a "Kaiser brand Typhoon Blower". I tried it several times, but my single speck remains ... so, I decided to invest in a Pentax O-ICK1 kit.
I have tried cleaning my K-7 several times with the Pentax "Imagesensor Cleaning Kit", basically concentrating on the center area of the sensor where my speck is, but no luck yet in getting the speck off. MERDE!
I spoke yesterday to the camera shop people and they indicated that I may have a "wet" dust particle, thus the Pentax kit is not effective here. I was also told that I may even have a bit of shutter and/or mirror lubricant which has migrated to the sensor.
I was suggested some wet cleaning kits, but the camera guy was honestly not too encouraging for certain products that they had in stock ... one product was mentioned as leaving "droplette" like pearls on the K-7 sensor since it dried in an "uneven" manner.
Basically I am now a bit frustrated ... What do you think (collectively) and any "next step" suggestions? Could someone send a photo of their home-made swabs, etc.?
Merci d'avance, (thanks in advance - for your help) Jean the Frog
PS: I can get my K-7 cleaned there for 39 Euros (plus two-day turn around time), but I am not too hot on the idea ...
Hi
Merde is what most likely is stuck on your sensor.
But really, I have cleaned dozens of sensors and if you use any of these: "Ethanol, Methanol or Isopropanol" I dont thing you can go wrong. None of these will leave anything behind on the sensor. They are 98% pure and the 2% is just water as it is impossible to remove it. So when you wipe the sensor with it you will see for a brief moment some rainbow colours appearing similar to newton rings between two flat pieces of glass. That is the "2% water" becoming visible. It evaporates enormously quickly.
Read my post a bit further up the top. I can't explain it any better than this. If you don't want to buy lint free fabric you can try spectacle cleaning cloth, your local optometrist may be able to give you some. Just be careful nothing is printed on it or use the unprinted part of the cloth, as the print may dissolve with the liquid. I prefer dedicated specially manufactured lint free fabric.
Try on a piece of glass first, a piece of mirror is always good for a test. Clean the spot of the mirror first, anything the cleaning trial will leave behind will then be visible. Use a magnifying glass for closer inspection.
I use Ethanol and have done so for a long time, no problems. Any of the sensors I have cleaned with it has not suffered in any way, and some of them have been cleaned with it a dozen times or more. Ethanol is the easiest to obtain from chemists as they use this often for ointments and things.
Yours is a typical case for my argument not to let crap linger on the sensor, because if it really is a piece merde I hate to think what it will do if it is left for a few months and has time to "ferment" with humidity. Then it will be stuck and you will really be in the merde.
And don't be too scared of this job, just be sensible about it, the sensor and the assembly of it are more robust than you think or "sensor cleaning kit" manufacturer want you to believe. And one more thing, shine a bright desk light into the the mirror chamber so you can clearly see what you are doing.
Greetings