HD PENTAX-FA 50mm F1.4

HD PENTAX-FA 50mm F1.4 with High Definition - high performance coating for high contrast and sharp images.

This lens is based on the smc PENTAX-FA 50mmF1.4, which was introduced in 1991 as the standard lens for 35mm SLR cameras.
Due to its large aperture and distinctive image reproduction, which is different from today's lenses for digital cameras, it has become increasingly popular, especially in recent years.
The popularity of this lens, which is one of the best-selling Pentax lenses, prompted us to redesign it. On the one hand, we wanted to preserve the special image reproduction of the classic, on the other hand, we wanted to produce a modern lens that meets the current demands of photography. The result is two lenses, and depending on the photographer's task or creative orientation, he can decide which lens to choose.

The HD PENTAX-FA 50mmF1.4 is equipped with the latest, high-quality, multi-layer HD coating that ensures sharp, high-contrast images right to the edges. And although it has the same focal length and open aperture as the smc PENTAX-FA 50mmF1.4 Classic, the two lenses differ significantly.

Distinctive image rendition

Thanks to its large F1.4 open aperture, this lens captures images with a very shallow depth of field. Its eight-blade diaphragm control mechanism produces a soft, natural bokeh (defocus) effect from open aperture to F2.8, and also minimizes the streaking effect of point light sources.

*Geometric optics MTF
(MTF calculated without referencing the effects of light diffraction phenomenon)
**Wave optical MTF (MTF calculated referencing the effects of light diffraction phenomenon)

MTF chart information

MTF (Modulation Transfer Function) is a kind of index used to evaluate lens performance, which represents the extent of subject contrast reproduction as spatial frequency.
The MTF chart here shows the contrast on the vertical axis, and distance from the center of the image on the horizontal axis. For the spatial frequency, 10 lines/mm shows a low frequency, and 30 lines/mm shows a high frequency, resulting in the MTF graph. On the graph, the solid line represents the S direction (sagittal direction and radiation direction) MTF, and the broken line represents the M direction (meridional direction and concentric circular direction) MTF.
In general, a low-frequency MTF is proof of a clear, high-contrast lens, and a high-frequency MTF is proof of a sharp lens with high resolving power.