04-07-2020, 07:00 AM
It's rather compact (810g), and measures149mm in length at the 70mm, but of course it extends
lens construction is 9 lens elements 14 groups, including 1 extra-low dispersion (XLD) element, 5 low dispersion (LD) elements, 1 glass-molded aspherical (GM) element, and 2 “hybrid” aspherical elements
filter thread is 67mm just like all Tamron holy trinity lenses 17-28 and 28-75
trading slightly on focal length to get a more compact zoom is a good idea Tamron had especially on this one where 180 or 200mm are close enough in daily practice, had I owned this one I wouldn't miss the extra 20mm reach
lens construction is 9 lens elements 14 groups, including 1 extra-low dispersion (XLD) element, 5 low dispersion (LD) elements, 1 glass-molded aspherical (GM) element, and 2 “hybrid” aspherical elements
filter thread is 67mm just like all Tamron holy trinity lenses 17-28 and 28-75
trading slightly on focal length to get a more compact zoom is a good idea Tamron had especially on this one where 180 or 200mm are close enough in daily practice, had I owned this one I wouldn't miss the extra 20mm reach