Let me say this, no matter how careful you are, sooner or later your will have DUST spots in your camera sensor. Its practically unavoidable, there mere action of zooming your lens in and out, will absorb the dust and find its way to your sensor. By you not seeing them in your images, doesn’t mean they are not there.
How to Spot Dust:
Normally you shouldn’t care if you don’t see it clearly on your images, if you cant see it, than no one can, but trust me its there. The problem starts when it becomes visible and somewhat ruins your images. However here is a tip how you can find out whether you have dust or not:
– Set your camera at Aperture priority
– Find a clean white sheet of paper ( I normally use the A4 Printing Paper)
– Go out in a sunny bright day and place your paper somewhere out side on the ground
– Set your Aperture at high value (8 and above)
– Set your focus into Manual. Most camera you can find that button on your Lens, just switch from AF to MF
– And Take the photo of the white sheet of paper
– Go and Download your photo into your computer
Now if your Sensor is really dirty, you will immediately see it, which means its time to send it to the SHOP and get it clean, but if you dont see it, it means you can live with it still and you are safe. BUT THAT DOESN’T MEAN THEY ARE NOT THERE. For me, to investigate further, I use Lightroom editing software and slide the “BLACK SLIDER” editing tool all the way to the left, this way I CAN SEE ALL THE SPOTS in my sensor. Below is an example of this technique using two of my cameras
My Leica M9 Camera
My Canon 5D MarkII Camera
As many of you know I am a wide aperture shooter, meaning I like to shoot at very low aperture value, so that I can get that dreamy depth of field in my photos. And because of that, I barely see any spots in my images, the spots are becoming visible when you start shooting at high Value Aperture, anything 8 and above such as landscape. Now, if the spots are not that much, than you can use HEALING SPOT tool in your editing software to easily remove it (Another reason why you should start editing your photos). Otherwise, you need to send your Camera to the shop to get your sensor cleaned.
I am a sad man today, my favorite camera Leica M9 is sick and I will have to be part from it for at least couple of months as it find its way to Germany for serious Servicing and Sensor clean. Oh well, thats life !
I hope this tip helped, and let me know what you thought about it and if you have any question of the technique I am more than willing to help