The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony DT 18-70mm F3.5-5.6 and the Sony 50mm F1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sony DT 18-70mm F3.5-5.6 is the longer of the two lenses at 77mm. The Sony 50mm F1.4 with a length of 43mm, is 34mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 66mm.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sony 50mm F1.4 weighs 222g, 5% (13g) lighter than the Sony DT 18-70mm F3.5-5.6's weight of 235g.
Both the Sony DT 18-70mm F3.5-5.6 and the Sony 50mm F1.4 have the same Filter thread size of 55mm.
Below are links to the 55mm filters that we recommend you to consider for these lenses:
Both the Sony DT 18-70mm F3.5-5.6 and the Sony 50mm F1.4 has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A68, Sony A77 II and Sony A58.
Sony DT 18-70mm F3.5-5.6 has a focal range of 18-70mm and 3.9X
zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-105mm
when used on a APS-C / DX format camera.
On the other hand, the Sony 50mm F1.4 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 75mm.