[i]a very good 1:2 macro lens with above average resolution and contrast Comprehensive pentax lens database with specifications and user opinions. Performance is fairly similar to kiron's 105mm f/2.8 macro lens
This is a tamron adaptall prime lens. Reviews of lenses by sigma, tamron, tokina, zeiss, zenitar, and others designed for pentax cameras Smc pentax 50mm f4 macro lens reviews and specifications
