The 16mm f/2.0 ED AS UMC CS Lens for Pentax K APS-C Mount from Rokinon is a manual focus wide-angle lens compatible with APS-C format DSLR digital cameras. It provides an 83.1° angle of view which translates into a 35mm format equivalency of 24mm. A fast maximum aperture of f/2.0 is effective in low light shooting and provides shallow depth of field. With two aspherical lens elements and one extra-low dispersion element, chromatic aberrations are minimized and sharp, color-accurate images are the result. UMC lens coating facilitates even light transmission and reduces ghosting and flare.

Pentax K Mount Lens    For APS-C Sized Image Format    Aperture Range: f/2.0-22    24mm Equivalency in 35mm Format    Two Aspherical Lens Elements    One Extra-low Dispersion Element    UMC Lens Coating    Manual Focus

Wide angle focal length equivalent to 24mm in the 35mm format

Fast f/2.0 maximum aperture for effective low light shooting and shallow depth of field

Aspherical and Extra-low Dispersion lens elements reduce aberrations

UMC lens coating allows even light transmission and minimizes ghosting and flare

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

Related Questions and Answers

Q: 1. Just purchased the Rokinon 16mm F/2.0 with Pentax K mount for my Pentax K-5 IIs body. With the aperture ring set to A, and setting to AV (also B, TAV modes), cannot get F stop to F2 (only goes to F4). Any suggestions? Already have an F4 lens, so getting to F2 is important. Thanks!

A: I believe the lens is defective. I would recommend contacting customer service to get a replacement.

Q: 2. Does this work with the d3400?

A: I use it frequently on a D3300, since it's almost the same camera I would safely assume it does.

Q: 3. I see this lens is made for APS-C sensors so why does it say 25.6mm in 35mm format. I would think that since it is designed for a smaller sensor you would not have to multiply the 1.6. In other words if I use this on my Canon 7d is it 16mm or 25.6?

A: Manufacturers almost always state a lens focal length at 35mm. So, it's in reality 25.6mm on a 1.6 crop sensor. I'm using it on the 7D as well. Unfortunately, due to the totally manual properties of the lens, the camera shows no info on what the actual focal length is...Doesn't show any info AT ALL, at least not on my 7D body. Takes beautiful astronomical shots tho, extremely low to no coma.

Q: 4. I'm seeing conflicting reports ... Will this lens work on a Nikon D5000 DX? Wanting it for night/astrophotography. Thank you!

A: Yes, Rokinon 16mm f/2.0 ED AS UMC CS for Nikon F Mount is fully compatible with Nikon DSLRs with APS-C sized image format such as your Nikon D5000. The lens is manual focus only therefore you will need to set your camera to manual mode (M), operate the aperture on the lens, and control the shutter speed and ISO on the camera.

Q: 5. Hello! Does it work perfectly on an APSH 1.4 crop sensor suck the 1DXii 4k mode?

A: No, sorry it will not work perfectly. In fact, it would not work without severe vignetting. We are also of the opinion that it will not even mount on the camera since EF-S lenses are blocked from mounting on an EF mount cameras.

Q: 6. Will I be able to use the in-camera manual-metering exposure system on a Nikon D7100 when using this lens?

A: Yes, when you set your aperture to the red f22, you will be able to use the sub command dial on the front of the grip, using your right index finger, to set and change your aperture and the exposure compensation button does function properly. Auto exposure has been very accurate on my d7100. The only thing missing is auto focus, which, in my opinion, would be almost useless anyway, with such a wide angle lens. Personally, I much prefer the big, smooth-turning, manual focus ring on this lens, to having auto-focus.

Q: 7. The dimensions on this lens are very large and long. Will this need a lens support to prevent strain on the MFT mount?

A: No, I dont use any kind of support for my BMPCC or GH4

Q: 8. where is the lens made?

A: According to the information we have, our current inventory's Country of Origin is South Korea. Please be aware this can change over the product's production life without notice.

Q: 9. hello! does this lens cover APSH sensor like the 1dxii 4k 1.4 crop?

A: No, sorry it will not work perfectly. In fact, it would not work without severe vignetting. We are also of the opinion that it will not even mount on the camera since EF-S lenses are blocked from mounting on an EF mount cameras.

Q: 10. Hi, will this lens fit on Canon EOS 800D?

A: Yes