I learned about this filter on some forum. It is used to darken skies or areas that might be overexposed when you have shadow areas that would be too dark if you exposed the sky properly. This house is usually very dark in the front later in the day. I tested the filter to see if the filter would help. There are other manufacturers who make this type of filter and you could probably get it cheaper...but I didn't do any searching before I bought it. I found the image still needed a bit of work to bring out detail in the house. All in all I think results will be good when I learn to edit properly. Right now the image, for me, has an unreal look.