5D3 sensor mark

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I'm getting a mark in my images but I'm not sure what it is. It's not visible when that area of the image is very bright but can be seen otherwise. It's there whatever the lens so I'm assuming it's on the sensor...





If it's a sensor clean that's needed, can anyone recommend somewhere in Leeds?
 
Dust bunny, try giving it a go with a rocket blaster first using the sensor clean mode, wouldn't personally bother with a sensor clean for just that one mark.
 
Do you qualify for cps? You can get a free clean at events.

Looks quite faint to be a dirt/dust blob, but you could try hiding the camera lens mount downwards and use the clean in the menu. If that doesn't work, lock mirror up and dust blower. Personally I wouldn't clean my sensor, I'd get canon to do it.
 
Thanks for the suggestions.

I've used clean in the menu with the lens pointed down a few times and have a Rocket Blower on the way, though I'm nervous of blasting more dust onto the sensor. We'll see...
 
It really isn't hard to clean your sensor. Use mirror lock up and try a gentle blow with the blower. If that doesn't cure it there are several companies that sell various cleaning kits, wet and dry.

Here's one to start with: www.cameraclean.co.uk

It is not something to feel intimidated about
 
I have been using a sensorklear pen on my old 5D, seems to do the job adequately and no complaints from me

Have also got a bottle of fluid and swabs, but they are overkill when its just dust, ideal if its anything like sticky pollen though
 
My Giotto blower arrived today so how do I go about using it? I really don't want to make things worse and go blasting even more dust onto the sensor. Do I aim straight at the sensor or at an angle? Short gentle puffs or longer gentle puffs?
 
Camera in sensor clean mode with well charged battery, couple of puffs of the rocket blower to get rid of any dust inside it and away you go.

Hold camera upside down and then a good few hard squeezes of the blower as you direct the nozzle across the sensor (low pass filter actually) Have read about not putting the tip of the blower beyond the camera mount, but personally want to aim at the sensor so get a lot closer than that.

Don't worry its not made of tissue paper and unless you go mad very unlikely you will ever do any damage. None of that gentle puffs business, you want to get it shifted, not soothe it with a gentle breeze.

Have a check after the intial clean by taking a shot of something light at f/16 upwards looking at 100%, if still showing marks have another go.

I think some people get too obssessed with dust spots and just one of those things that can't be avoided, must be an OCD sufferers worst nightmare.
 
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I've used a wet kit successfully on my 20D, it isn't a sure thing but I followed this process.

Blow,
Check (f16 camera out of focus IS on long exposure over a light surface jogging the camera.)
If you can still see marks blow again
If no improvement, wet clean
If still marks wet clean again

You should be checking for improvements each time and comparing the checking images you take.
 
I've used Clean Now in the menu several times and it's made no difference. I've also given it a go with the blower but, again, made no difference. So now I've got a Speckgrabber-Pro to try.

Before I set to with that, and because I can't actually see the spot on the sensor, how does the position of the spot on the image relate to its position on the sensor? On the image it's pretty much central left to right and a third of the way from the top. Does that translate to the same position on the sensor, or should I be looking a third of the way up from the bottom?
 
It'll be on the same `side` but `upside down` (if that makes any sense. lol)

If near the top in your image, it'll be near the bottom of the sensor. (but on the same side)
 
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Try shining a torch onto it prior to cleaning. That may locate it
 
Job done, almost.

It was a sunny day today so I could get sunlight directly onto the sensor and that showed up the speck of dust really well. Thankfully, the Speckgrabber-Pro lifted it off with the lightest of touches: in fact I'm not sure I touched it!

Checking a couple of test images afterwards there's still the very slightest of marks but I think I can live with it until the sensor needs a proper wet clean.

Thanks all for the advice. Poking around in a £2000 camera's sensitive bits is quite scary...
 
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