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The Nightwatchman



Exposure Time: 25.0 s;
FNumber: f/14.0;
ISOSpeedRatings: ISO 400;
ExposureBiasValue: +10/6
FocalLength: 16.0 mm


From the category:

Landscape

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Hello Makala,

Very nice picture. 

I looked at the details, exposure 25 sec, but still you use iso 400.  Why not 100 to avoid noise.  Just wondering ...and trying to learn.

Ben

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All: Thanks for the kind comments.

Ben: At ISO 100, I would have needed to make a 100s exposure to get the same results as 25s @ ISO 400. Of course, lower ISO is preferred for lesser noise but in this scene, the moon would have moved a considerable distance in the 100s case. That's the reason I bumped up the ISO to 400. If you look carefully, you can notice a slight blur due to the moon's movement even at 25s. Moreover, there are no trails in this area and I was getting a bit anxious if I could find my way back to the parking lot. I wanted to finish up and leave asap :-) 

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