"A cheap alternative to long lenses over 500mm are mirror lenses. Cost effective, light, and extremely portable, mirror lenses have become popular with amature photographers who operate on a tight budget. One drawback of mirror lenses are the unusual bokeh or blurry circles."@en . "A cheap alternative to long lenses over 500mm are mirror lenses. Cost effective, light, and extremely portable, mirror lenses have become popular with amature photographers who operate on a tight budget. One drawback of mirror lenses are the unusual bokeh or blurry circles."@en . "Mirror Lenses"@en . .