Relation between dust and aperture setting

Started Mar 30, 2014 | Questions thread
soloryb Senior Member • Posts: 2,315
Re: Relation between dust and aperture setting

What you are experiencing is exactly why Nikon recommends that you keep the aperture below f/16 for the D800. That dust is there - whether or not it is observable at the wider apertures. As far as I know, this dust becomes more visible due to the increased diffraction occurring at f/16 and above. Lower resolution sensors don't show this but a 36-MP sensor will.

You have two basic choices here. Either you can shoot at below f/16 or live with the dust and remove it in post.

BTW, one of the steps that I use before cleaning is to take several de-focused shots of a uniform light background (I use a mat board) with the aperture set to f/16. Vary the distance so that the images are not all exactly the same. Then import them into Lightroom and use 'Visualize Spots' under the Spot Removal tool. Playing with the slider will bring out even the most minute dust particles on the sensor. Even after careful wet cleaning, it's almost impossible to eliminate all the spots, but you can get the worst of them off if you're diligent enough. Any spots remaining probably won't be visible in normal shooting below f/16, but in your case, keep repeating the cleaning until any dust becomes tolerable.


Photonique wrote:

Hi all,

this is my first post in this forum although I've been reading it since many years. I'm owning a D800 since 4 months now and I am very happy with it. However, I've had increasing issues with dust levels on my sensor. Anyway, my question is not related to how to remove such dust but I made an observation which I can't find an answer to:

When I take a photo of a bright white wall at high aperture number, say f22, I can clearly see a lot of dust particles. But when I set the aperture to f3.5, all dust particles are no longer visible. How can that be? I mean the dust will not change deepening on aperture setting. So it must have something to do with the light entering through the lens and hitting onto the particles. This phenomenon is also clearly visible when using life view mode.

Does anyone know why this is happening?



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