I have all the gear for this including a 10x loupe with led lights, but it just doesn't focus on full frame sensors - ok with 1.6 and 1.3 crop sensors, so I have to do it the long way:
- Take an out of focus shot of a well lit white subject - paper or card, or a white wall, @ F16, or F22.
- Upload to computer, adjust contrast to provide just whites and blacks to show the extent of sensor dust.
- Open the sensor and use a hand blower, sensor brush, or Arctic Butterfly brush to remove dust.
- Take another shot, upload, adjust contrast and examine results.
- A lot of my remaining spots were circular and most likely oil spots, so required a wet clean.
- I use Sensor Swab with Eclipse E2 fluid for a wet clean.
Altogether, I had eight attempts to clean the sensor to my satisfaction and including the start and finish shots, that was nine photo's and uploads.
I should now be ready to shoot a few landscapes in a week or so's time, when I am in Bridlington, Bempton and the Farne Islands.
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