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Zen and the Art of Digital Sensor Maintenance

voyageurfred

Montreal, CA
499 posts

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"Enlarge image to 100% to see small dust"

voyageurfred Silver Member Nikonian since 20th Jun 2007
Wed 12-Dec-12 04:04 PM

"Checking for Dust: There are two methods for checking for dust. You can take a photograph of a clear blue sky or a smooth white wall using a 50mm lens or smaller at f16 or f22. If dust exists it will be seen in the image."

It should be added, that to truly see how bad the dust is, or conversely... how clean your sensor really is, enlarge your image to 100%, then use the hand tool in Photoshop Elements or PS-CS to more around and carefully examine the full sized image on your computer screen.

I have attached a rather, unhum, embarrassingly dirty image from a shoot in France's Loire Valley this summer. The first is full frame, 900 pixels wide, with only RAW processing performed, then a straight conversion to an srgb JPEG file. At first look, it appears to be pretty clean.

The awe... what alotaCRAP! moment comes, when you enlarge to 100% and discover, just how bad it can get, as seen in the second image of the area above the towers.

I had thoroughly cleaned my sensor the evening before. All it took was a few lens changes during the day, for those dirty rascals to sneak in! The little buggers!

Thank you for your excellent post Mark



Click on image to view larger version


"Chambord at Dusk"
Nikon D700 with Nikkor 24-70 f/2.8D AF-S at 70mm
Exposure: 10sec @ f/22, ISO 200.
Shown here full frame at 900px wide,
RAW processing from NEF file in PS-CS4
resized to 900px wide then sharpened with Unsharp Mask
©Copyright 2012 Frederic Hore


Click on image to view larger version


Same image, enlarged and cropped to 100%! Red points next to dust.
(Note: dust is more visible on my 23 inch screen then in this reduced quality JPEG image)
Now where did all that come from!!!!
©Copyright 2012 Frederic Hore


Frederic in Montréal

Nothing ventured... nothing gained!
http://www.RemarkableImages.ca


Attachment#1 (jpg file)
Attachment#2 (jpg file)

This is a hot, active topic! Zen and the Art of Digital Sensor Maintenance [View all] , mpage , Sat 08-Dec-12 11:28 PM
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