Seeing any warbler behind the house is cool, let alone a Pine warbler, a species that I have not seen (for certain ) in several years. A wide-field bin works well for warblers but they tend to be from top-brand manufacturers and cost a bundle. My father had a pair of wide field from Germany that date back to at least the 1940's, or 50's. They were light-weight and clear as can be. I dropped them when I was young and careless, which was better than now, old and careless, and the resultant impact cracked the glass. I wish that I still had them. Don't know the make. I really should get myself a pair but then I would have to carry them. What else am I suppose to carry? Laden down with too much gear people are liable to think me serious and assume that I know what I'm doing. I don't even know what that's like.