The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 40mm F1.4 DG HSM A and the Sigma 50mm F1.4 DG HSM A 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. Sigma 40mm F1.4 DG HSM A is the longer of the two lenses at 131mm. The Sigma 50mm F1.4 DG HSM A with a length of 100mm, is **31mm** shorter. Besides being longer, the Sigma 40mm F1.4 DG HSM A also has a larger diameter of 88mm compared to the Sigma 50mm F1.4 DG HSM A's 85mm diameter.

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.

Below you can find the dimension and weight table of the **Standard Prime** Lenses in **Sigma SA Mount** for size comparison purposes.

**Standard** Lenses in **Sigma SA Mount** for Size Comparison

#### Filter Threads

The Sigma 40mm F1.4 DG HSM A has a filter size of **82mm** whereas the Sigma 50mm F1.4 DG HSM A has a **77mm** diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.

Below are links to the **82mm** filters that we recommend you to consider for the Sigma 40mm F1.4 DG HSM A:

And these are the **77mm** filters that we recommend for the Sigma 50mm F1.4 DG HSM A:

#### Lens Mounts

Both the Sigma 40mm F1.4 DG HSM A and the Sigma 50mm F1.4 DG HSM A has the same Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill.

Sigma 40mm F1.4 DG HSM A is also available in Canon EF , Nikon F (FX), Sony E and Leica L mounts.

Sigma 50mm F1.4 DG HSM A is also available in Canon EF , Sony Alpha, Nikon F (FX) and Leica L mounts.

#### Focal Range

Sigma 40mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 40mm.

On the other hand, the Sigma 50mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 50mm.