The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon EF 50mm f/1.8 STM and the Canon 50mm f1.8 II for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Canon 50mm f1.8 II is the longer of the two lenses at 41mm. The Canon EF 50mm f/1.8 STM with a length of 39mm is 2mm shorter. On the other hand, the Canon EF 50mm f/1.8 STM has a larger diameter of 69mm compared to Canon 50mm f1.8 II's 68mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Canon 50mm f1.8 II weighs 130g, 18% (29g) lighter than the Canon EF 50mm f/1.8 STM's weight of 159g.
Below you can find the dimension and weight table of the 'Standard Prime Lenses in Canon EF Mount for size comparison purposes.
Standard Prime Lenses in Canon EF Mount for Size Comparison
Both Canon EF 50mm f/1.8 STM and Canon 50mm f1.8 II has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Both lenses have the same focal range of 50mm and the fastest aperture of F1.8.