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Message: <blockquote data-quote="Geoffc" data-source="post: 235631" data-attributes="member: 8705">The other thing to consider is viewing at 100%. On these very high res sensors 100% is a huge picture that will show any blemish. I tend to look at my D800 images at 1:2 when I'm being realistic.For your landscapes try exposing to the right for your highlights and then add 1 or 2 stops which will still not blow them. The camera meter is good for 30 second exposures. On a ten stop I measure without the filter then use an iPhone long exposure calculator to work out the exposure.One other thing is light leakage. On the 7100 it leaks from the eyepiece if it's uncovered on long exposures. On my D300s it leaks from the focus assist lamp. This is visible at 30 secs.</blockquote>