Tamron belongs to that group too – for many years they offered such lenses like the Tamron SP 70–210 mm f/3.5–4 Adaptal or the Tamron SP 70–210 mm f/3.5 Adaptal, deemed to be optically quite complex (15-16 elements) at that time.
solid and sealed casing; excellent image quality in the frame centre; very good image quality on the edge of APS-C; sensible image quality on the edge of full frame; moderate longitudinal chromatic aberration; low distortion; sensibly corrected astigmatism; nice out-of-focus areas; slight...
lack of autofocus limiter; lateral chromatic aberration corrected less efficiently than in the case of the rivals; too weak performance against bright light; modest standard accessory kit; worse than the one offered by brand name rivals