IMPORTANT! Long time exposures without purpe corner!

Started Oct 19, 2005 | Discussions thread
Nordstjernen
OP Nordstjernen Veteran Member • Posts: 6,876
Over exposure, I think

Seems like your photo is overexposed (exif: 42 seconds at f/5.6 ISO 100), and that the all over purple cast is the object's color (the clouds).

If the photo was made at late twighlight, and not complete darkness, this purple color cast is not unexpected, I think. When I darkened your shot I could hardly isolate the purple light in the upper left corner.

This defect shows up just in the upper left corner, stronger the longer exposure, and it is best seen against dark backgrounds.

When you expose up to 30 seconds I will strongly recommend to use the camera's own noise reduction to get the best results. For longer exposures the mentioned raw converter should be VERY useable, and a real time saver.

If I forgot to mention: This raw converter also does an impressive job with ordinary photographs (where dark frame subtraction is not needed).

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