I was able to try out some pretty powerful ND Filters. A ND (Neutral Density Filter) reduces the intensity of all wavelengths or colors equally. I stacked two filters together which equals to a drop of 13 f/stops. There was a learning curve. First, you must use an eyepiece shield to block your viewfinder. Light will filter in on long exposures and create a band of color across your image. I also learned that you cannot stack more than three filters. If you do, you will pick-up the filter ring in the image. Also, on long exposures, hot pixels will show on the image (it will look like dust). There are elaborate ways to get rid of this, but I used Photoshop and Lightroom to remove most of it.
This image above shows what happen if you do not block your eyepiece.
Taken at Wadleigh State Park. This image exposure length is 485 seconds. There were
kids playing in the water, but because of the long exposure they do not show up.
The wilder Dam. This image is 605 seconds long. All of the images were ISO 100 and f/22.
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