|Unless you correct lens vignetting, your NightScape images will look like the left image.|
Milky Way over "Three Sisters" formation in Monument Valley ~ © Royce Bair
NightScape photography brings out the worst in lens vignetting because one is often forced to shoot wide open in order to reduce shutter times (keeping star trailing to a minimum), and to lower ISO settings (keep down digital noise), which are already unusually high.
Adobe Camera Raw to the rescue. ACR's "Lens Corrections" feature can virtually eliminate lens vignetting problems. If you are using a major brand lens with electronic coupling to your camera body (Most Canon, Nikon, Sony, and many Tokina, Sigma and Tamron lens), ACR will automatically pull up your lens' profile (using the image file's EXIF info) and make the needed vignetting corrections (and distortion corrections) when you check the "Enable Lens Profile Corrections" box! You can control the amount of these corrections using sliders. I typically allow the profile to make a full, 100% correction.
Using ACR is one of many reasons to shoot in camera RAW. ARC is available in both Adobe Photoshop and Adobe Lightroom.
|No lens vignetting correction on left - ARC "Lens Corrections" to right image|
"Milky Way Paint Brush" - Kodachrome Basin State Park ~ © Royce Bair
|By checking the "Enable Lens Profile Corrections", ARC's "Lens Corrections"|
feature automatically applies vignetting and distortion corrections to your
Canon, Nikon and other major brand lenses. Note the change in the histograms.
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