Canon EF 50mm f/1.0L USM Review Canon RF 50mm F1.2L Review Tamron SP 24-70mm f/2.8 Di VC USD Review Tamron 24mm F2.8 OSD M1:2 (F051) Review Tamron SP 24-70mm f/2. The performance of the Canon EF 28-70mm f/2.8 USM L came as a surprise because its optical quality exceeded the EF 24-70mm f/2.8 USM L (two samples tested). The lens doesn’t really show any significant flaws – the resolution figures are very high and distortions and especially vignetting are very low. The degree of CAs is pretty decent for f82ltoy.