The 16mm f/2.0 ED AS UMC CS Lens for Canon EF-M Mount from Bower is a manual focus wide-angle prime lens compatible with Canon APS-C format mirrorless digital cameras. It provides an 83.1° angle of view which translates into a 35mm format focal length equivalency of 25.6mm. 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 high index extra-low dispersion glass, chromatic aberrations are minimized and sharp, color-accurate images are the result. Full multi-coating facilitates even light transmission and reduces ghosting and flares.

Canon EF-M Mount/APS-C Format    25.6mm (35mm Equivalent)    Aperture Range: f/2.0-22    Two Aspherical Lens Elements    High Index Low Dispersion Glass    Multi-coated Optical Glass    Minimum Focus Distance: 7.8"    Manual Focus

Wide angle focal length equivalent to 25.6mm in the 35mm format

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

Two aspherical elements and high index low dispersion optical glass reduce aberrations.

Lens multi-coating allows even light transmission and minimizes ghosting and flares.

Related Questions and Answers

Q: 1. I know this is a full manual lens, but shouldn't I at least get metering in manual mode on my 80D? Not there. Is there something I'm missing?

A: There is no communication with my Rebel T6 either.

Q: 2. I'm using the T-Mount with a Celestron SLR Camera Adapter. I noticed it came with a protector black cap. Since I'm assuming it wasn't meant as waste on the manufacturer's end, is it meant to be an inside the lens cap when not in use, since a standard lens wouldn't fit on the outside? Please advise on its purpose so I utilize it more efficiently. Picture would be greatly appreciated if not too much effort.

A: I didn't get one with my adapter, and the only cap that I use is the cover for the bayonet end. When it is not attached to the lens, I don't use anything at all. If anything, my guess is that it is meant to prevent damage to the threads.

Q: 3. I am very confused, how do you use this T-mount to a camera designed to fit it's design onto a telescope? Doesn't the T-mount have to be a specific size? For example if you needed this to fit 1.25 focuser, how would you know that this t-mount fits this size? Can anyone explain or redirect me to a different adapter?

A: You need to use an adapter compatable with your telescope. If you want to use an CanonEOS camera, and there is not a campatable adapter for you telescope for the EOS, you mayhave to diasy chain mreo tha one adapter. If you have parfocailty problems, you mayneed to piroitize focus on the camera viewfinder, and secondarily adjust the focus of youroculars. Best, RJR

Q: 4. Does this lens have a focus-assist chip that works with a Nikon D7100?

A: I have the Nikon D5200. The Rokinon 2.0/16MM ED AS UMC CS does have a focus assist chip. A green dot appears in the viewfinder or on the live view screen when the lens is in focus. I have no experience with the D7100.

Q: 5. What's the filter size for this lens? Is it 77mm? I have 52mm, 62mm and 68mm now can I just buy a 77mm adapter ring?

A: The filter size is 77 mm; this is a wide angle lens so you cannot use a smaller filter with adapter ring, this would cause vignetting.

Q: 6. When on a crop sensor is it equivalent to a 24mm lens on a full frame sensor? Or is it a 16mm FOV?

A: When on a APS-C sized sensor its field of view of 69.7 degrees x 49.9 works out to the equivalent of a 24mm on a full size sensor

Q: 7. What is the length of this lens?

A: This lens has a focal length of 16mm and a physical length of 4.56 inches.

Q: 8. will it work on my sony a7?

A: This lens is designed for use on APS-C format sensor cameras, so it would only be compatible on the A7 and other full frame E mount cameras when used in crop mode.

Q: 9. Is this compatible with a Canon 70d? Do I have to consider crop sensor or not?

A: Yes. 70d uses APS-C.

Q: 10. How is does this lens perform in video mode? Looking for a budget option to the Sigma 16mm f/1.4 because I don't have a mirrorless camera.

A: This is a great choice when compared with the Sigma, but with two potential disadvantages. Its aperture is a little smaller than the Sigma's f/1.4, and this lens is manual-focus only, whereas the Sigma 16mm f/1.4 has autofocus capabilities.