Before you send in your camera or anytime your going to do a job or important pictures:
Put a lens on your camera, you can change lens later and repeat if you think it might be lens.
set focus to infinity - some like out of focus you can try both?
Aperature priority at least F22
set exposure compensation to +1 optional
Set camera on Tripod and lock down
Find White paper, beige wall, white wall or blue sky - these need uniform color and lighting.
Focus in - or out of focus because your not interested in the actual paper but where the spots show up. Both work.
Take shot - Got Spots?
If you have dust.
{At wider apertures (F8 or below) the dust may be undetectable. Smaller aperatures (F22) will show all}
Increase your contrast to exagerate spots and zoom in to see spots - you can zoom in on some LCD's on the camera but computer is much better.
Your spots on the shot - will be located opposite on the sensor since it flips the picture - that will get you on the location faster.
here are references:
http://www.bobatkins.com/photography/tutorials/sensorclean.htmlhttp://www.the-digital-picture.com/Photography-Tips/Sensor-Cleaning.aspxhttp://www.cleaningdigitalcameras.com/methods.htmlhttp://www.photosol.com/store/pc/viewPrd.asp?idproduct=4&idcategory=2You can do it yourself -
there are many different products but as mentioned before it can move dirt around until you have used 2 or 3 sensors?
If you use the bulb it can also blow dust around on the mirror and all over the inside of the camera as well.
NIKON uses dust off reference photo which you can apply to the recent pictures you took or future pics till sensor is cleaned. Canon may have similar called different but its supposed to work good.
If you send it to factory its usually 70-80 bucks but they do run diagnostics and tell you if somethings wrong - i had a resistor or something bad on my camera they fixed while it was into Nikon.
ther is the artic butterfly - spinning brush thats used to swipe the sensor and by spinning its supposed to create static electricty to pick up loose dust. We used on my wifes 40D and it made more of a mess than it fixed - our friend paid 169.00.
If you get swabs to do it -
you need the proper size for your sensor
DO NOT SOAK swabs and DO NOT put any kind of pressure on the sensor (its actually a filter over the top of the sensor and you are not touching the sensor) at all. TOO much liquid and it goes under the filter and get onto the sensor and can ruin it - light fluid. Putting too much pressure can scrape the filter on the sensor and possibly damage areas on the sensor.
I have a SensorKlearLoupe - but didnt get the sensorklear lens pen because i wasnt sure and couldnt find reviews on it. The loupe is lighted and you can see the dust and where its located for sure. You have to remember where you see it is opposite of where it will show on the picture. I have been using the eclipse sensor fluid cleaner and their swabs, if you buy the pec pads and keep the rubber bands on the swab - you replace the used pads with cut out pec pads and put them back onto swab folded like they were and it costs allot less than continually buying swabs - just make sure when you cut them and remount on plastic swab there is nothing hanging from cuts to put stuff back onto your sensor.
Nikon and Canon can both look at your sensor because they can get HOT SPOTs or dead spots (if your camera is newer it probably is dust which can become welded t filter and difficult to remove) which they can disable those spots from showing up in your photos.
My D200 is getting old now and i think i will send in to look for hot spots as well as cleaning - might have to buy the D700 while it is in the shop and use D200 for backup but once you get used to the older camera you know everything very well - new camera means different stuff albeit better usually.
If your not comfortable - find local camera shop that has cleaned somebody elses sensor you know, so you dont spend 70 bucks and your sensor still isnt clean. Or send in to manufacturer if you got the time and money.
Some have the money but need the camera now - this is where cleaning your own with correct knowledge will save you or your customer.
Again your not actually cleaning the sensor - the low pass filter and another filter i cant remember. When and if you load up the sensor swab, you could possibly reach the sensor behind the filters ----- that is why its important to never use more than 2 or 3 tiny drops.
The manufacturer can replace the filters but if your careful all should go well.
I like my sensorklear loupe because i put it on, run it up or down to get close and i know how good or bad it is and where it is on the sensor instead of - dot on upper right, would that be lower left or upper left. I may try the lens pen if i can find reviews - people on here should know and i would apprecaite if somebody has udes the sensorklear lens pen