IMPORTANT! Long time exposures without purpe corner!

Started Oct 19, 2005 | Discussions thread
Craig Davis Regular Member • Posts: 219
Re: Over exposure, I think

You are correct it was a little over exposed. I didn't get the settings quite right. I did notice it was more of a balanced purple haze rather than just the top corner.

I'll contact Frank in the hope that he may let me have a play with his program to see if it helps me with the long exposures.

Thanks for taking a look at it for me.



Nordstjernen wrote:

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

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

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