The 50mm f/1.4 AS IF UMC Lens for Pentax K Mount from Rokinon offers a standard 50mm focal length in the full frame format and a very fast f/1.4 maximum aperture for effective low light shooting, fast shutter speed capture, and shallow depth of field control. When used on cameras with an APS-C format sensor its 35mm focal length equivalence is 75mm. 

The optical design of the lens consists of 9 elements in 6 groups, including one hybrid aspherical element and one aspherical element to reduce chromatic aberrations. Also, lens elements are coated with an Ultra Multi-Coating to improve light transmission and minimize flare and ghosting. Eight diaphragm blades create a circular aperture for more attractive out-of-focus highlights.

As a manual focus and manual aperture lens, it provides a rubberized focus ring and clear aperture, distance and depth of field markings. Its internal focus system will not extend the length of the lens while focusing and an included petal shape lens hood blocks unwanted light and protects the lens.

Pentax K Mount/Full-Frame Format    Aperture Range: f/1.4 to 22    One Hybrid and One Aspherical Element    Ultra Multi-Coating Lens Coat    Manual Focus & Aperture Lens    Internal Focus Design    Bright Distance & Depth of Field Scales    Minimum Focus Distance: 17.7"    Filter Thread Diameter: 77mm    Removable Petal Style Lens Hood

Standard length prime lens for full frame cameras, also compatible with APS-C cameras on which it has a 35mm focal length equivalence of 75mm

Very fast maximum aperture of f/1.4 for effective low light capture and shallow depth of field focus control

Hybrid aspherical and aspherical lens elements control chromatic aberrations for clear and color-accurate images

Ultra Multi-Coating (UMC) improves light transmission and reduces ghosting and flare

Manual focus lens with internal focus system

Eight-blade diaphragm creates circular aperture

This lens features a mechanical aperture coupling that permits the use of aperture priority and automated exposure modes, as well as the ability to control the aperture setting with Pentax DSLRs

Includes removable petal-shaped lens hood

Related Questions and Answers

Q: 1. will this lens (Rokinon 85mm f/1.4 AS IF UMC Lens for Canon EF) work with a canon EOS 70d?

A: You want to determine your lens mount (may be ef-s) and if it will accept EF lens.

Q: 2. Will this work on a sony a65?

A: Yes it will but it is a manual focus lens. I went with he sony 85mm

Q: 3. Does this lens come with contacts for EXIF support and aperture control?

A: This is a fully manual lens, including aperture.

Q: 4. Does this work with the Nikon D3200?

A: Yes. This lens is an F mount. This is a manual focus and manual aperture lens.

Q: 5. One reviewer claims fast auto focus is this sense auto focus, or manual focus?

A: Manual focus

Q: 6. Does this lens have a declicked aperture ring like the Rokinon 35mm lens?

A: Yes, it has an aperture ring -- f/1.4 to f/22.

Q: 7. Is the aperture ring on this lens declicked for cine/video work ? What is the difference between this lens & Rokinon’s Cine line of lenses ? I would use as a prime on my FS7

A: It is not, this does not offer a de-clicked aperture. That is one of the main differences between this and a Rokinon Cine lens like B&H # RO5015TSE. Rokinon Cine Lenses offer a de-clicked aperture and have lens gears built in for use with Follow Focus Systems. https://bhpho.to/2psJeOp

Q: 8. is this lens compatible with nikon d3200?

A: Yes it is compatible. But autofocus will not work. Autofocus confirmation chip with rangefinder option on will have to be used , or manual fpcus have to be used.

Q: 9. Would it fit Canon 70D mount?

A: Yes, the Rokinon 50mm f/1.4 AS IF UMC Lens for Canon EF Mount is a Canon EF mount lens and is compatible for use with the Canon EOS 70D DSLR camera, which uses both EF and EF-S mount lenses.

Q: 10. Will it work with sony a77? Thank you

A: Yes, the Rokinon 85mm f/1.4 Aspherical Lens for Sony is compatible with the Sony A77.