1. HD Coating* to enhance imaging power

After a thorough review of the lens coatings applied to the ever-popular smc PENTAX-FA50mm F1.4, PENTAX decided to apply the latest, high-grade, multi-layer HD Coating to this new lens. Compared to conventional multi-layer coatings, this high-performance coating effectively reduces average reflectance and improves light transmittance, delivering clear, high-contrast images with minimal flare and ghost images, even in demanding lighting conditions such as backlighting.

* HD stands for High Definition.

2. New exterior design to match the latest digital SLR models

While retaining the dimensions of its base model -- the smc PENTAX-FA50mm F1.4 -- this lens features a totally new exterior design, similar to that of the latest DA and D FA-series lenses. This makes it a perfect match for K-series digital SLR cameras.

1. Distinctive imaging characteristics

Through intentional fine-tuning of the lens design, this lens has been designed to produce a unique visual effect commonly known as rainbow flare when it captures an image at open aperture* and against strong backlight.** It lets the photographer change the position and size of rainbow flare by shifting the relative position of the subject and light source, creating a unique, one-and-only visual expression not available with the latest lenses. By closing the aperture down to F4 or smaller, the photographer can capture sharper, crisper images that are free of not only rainbow flare, but also ordinary flare and ghost images.

* It may be difficult to create rainbow flare when the lens is mounted on an APS-C-format digital SLR camera, because the camera's image sensor is designed to use only the central area of the image circle.

** During shooting, the user is advised to mount an ND (Neutral Density) filter (included as a standard accessory), or a commercial ND filter designed to reduce light transmittance to lower than a 1/16 level, on the lens. When observing an image through the camera's optical viewfinder, the user is advised to avoid looking directly at strong light sources.

2. Nostalgic design

This lens retains the exterior design of the smc PENTAX-FA50mmF1.4, featuring a black matte finish and a matte-black focus ring. It has no green ring -- the symbolic design of recent PENTAX digital-specific lenses -- to recreate the nostalgic appearance of an old-time lens from the film-format SLR era.

• ①When mounted on a PENTAX digital SLR camera body, these lenses can be used as 50mm standard lenses in the full-frame format, or 76.5mm medium-telephoto lenses in the APS-C format. With a full-frame camera, they provide an angle of view close to that of the human visual field, making it an ideal choice for a wide range of applications, such as snapshots, scenic images and portraiture.
• ②The large F1.4 open aperture produces images with a very shallow depth of field.
• ③Water- and grease-repellent SP (Super Protect) Coating has been applied to the front surface of the lenses, making it easier for the user to wipe off water or stains.
• ④The 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.
• ⑤Designed to be fully compatible with older K-mount digital SLR cameras and film-format AF SLR cameras, these lenses allow the photographer to retain all camera functions, thanks to the aperture ring installed on the lens body, and the mechanism designed to couple the lens with the camera's motor-driven, in-body AF system.

Major Specifications