I received these binoculars two days ago and have been putting them through the paces, indoors and outdoors. The temp. outside today was about 25 degrees fahrenheit, a partly cloudy winter day. I came across some Cedar waxwings and also a Downy woodpecker, the views through these Pentaxs' were great, I noticed the focus was very sharp and the Birds colors looked natural. During use I found that I could fairly easily track down the birds when looking through the binocs, and when they would fly from tree to tree I was able to keep track of them and re-focus when they landed. The view takes on a very detailed and three dimensional look through these, the depth of field is great and the Pentax PCF 8x42's lenses seemed to wrap around the birds and they just ' Pop' out at you, very impressive in my opinion. As to build quality, they are very sturdily built and comfortable to hold, these binoculars had a lot of thought put into them, from the focus lock switch, to the divets for your thumbs on the underside, to the sharp looking external coating, plus the all important fully multi-coated optics and Bak-4 prism, I am very satisfied with these Pcf 8x42's. Indoors in poor light, I could get a sense of the brightness of the binocs, and can say that these will perform well at daybreak or dusk, and I can also confirm that the minimum focus distance is what Pentax states(11.5ft). I do wear glasses and the eyecups are adjustable,smooth operating, and comfortable.If you are looking to get into birding, hunting, or nature watching, the price at which you can buy these makes them a great 'bang for the buck'. Pentax has been making camera lenses for about ninety years, they know what they are doing. Peace in 2010 and thereafter.