How the Two Differ:
In heft, operation, and general feel, Tamron's 45mm f/1.8 is almost a doppelganger for the 35mm. It takes the same size filters, is available in the same mounts, has the same advanced weather-sealing, and is priced the same. Notable differences, though, include the 45mm's lack of an XLD glass element, longer manual-focus turning radius, lower maximum subject magnification, and length (about 0.4 inch longer than the 35mm). Tests of sharpness, contrast, distortion control, subject magnification, and stabilizing ability showed near matches.