willie_901
Veteran
I owned a D300 that occasionally splashed oil droplets on the sensor.
The issue is oil. The shutter spits oil droplets onto a corner of the sensor. The oil dispersion is not random. This is a defect.
Then the oils attracts dust. The dust sticks to the oil. Without regular wet cleaning the oil slowly evaporates and the dust/oil-residue spot becomes hardened.
You can not remove oil with a blower and after the dust sticks to the oil you can't remove the oil-residue/dust spot with a blower.
About 95% of the oil spots can be quickly removed without consequence by cloning. Every once and a while removing the oil in post takes time. This is highly dependent on the subject. The smaller the aperture, the more you see the problem.
In bodies where the oil splattering is constant, eventually so much oil and dust accumulates simple spot cloning becomes impractical. This means the sensor has to be wet cleaned on a regular schedule.
The issue is oil. The shutter spits oil droplets onto a corner of the sensor. The oil dispersion is not random. This is a defect.
Then the oils attracts dust. The dust sticks to the oil. Without regular wet cleaning the oil slowly evaporates and the dust/oil-residue spot becomes hardened.
You can not remove oil with a blower and after the dust sticks to the oil you can't remove the oil-residue/dust spot with a blower.
About 95% of the oil spots can be quickly removed without consequence by cloning. Every once and a while removing the oil in post takes time. This is highly dependent on the subject. The smaller the aperture, the more you see the problem.
In bodies where the oil splattering is constant, eventually so much oil and dust accumulates simple spot cloning becomes impractical. This means the sensor has to be wet cleaned on a regular schedule.