This is a tamron prime lens. Performance is fairly similar to kiron's 105mm f/2.8 macro lens Tamrons' fast 300's were probably their best adaptall lenses, they were certainly the most expensive due to large low dispersion elements
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This is a tamron adaptall prime lens.
[i]this is an absolutely superb optical design which features a three element focus group incorporating one low dispersion (ld) element, plus a five
This is a tamron adaptall zoom lens. This is a tamron zoom lens. Reviews of lenses by sigma, tamron, tokina, zeiss, zenitar, and others designed for pentax cameras Comprehensive pentax lens database with specifications and user opinions.
[i]a moderate wide angle lens with slightly above average performance [i]a very good 1:2 macro lens with above average resolution and contrast
