Rokinon 16mm F 20 for Micro 4/3 Reviews Youtube

First off, please notation that there are 2 different Rokinon 16mm T2.two lenses in the Canon EF mountain. One, the CV16M-C, is a discontinued older version (but still available equally "new" from some retailers) that does not take the hybrid aspherical element that the newer DS16M-C includes. Either lens is designed to be used on an APS-C camera, such equally your 450D. Both lenses will mountain on a FF Canon camera, simply the image circumvolve volition non cover the unabridged sensor. The version with the hybrid elements is currently priced about $200 more than remaining stocks of the older version at retailers that withal offer it new.

Now for a complete aside to discuss the word "hybrid" as used in the video: The mention of 'hybrid' in the video is used to depict a lens with cinema type interfaces and controls that has consumer quality "still" blazon drinking glass and optical structure. Such lenses often "exhale" when focusing (the field of view expands or contracts as the focus distance changes - information technology'southward almost as if the fixed focal length lens is 'zooming' in or out slightly). Some will shift focus slightly when the aperture is inverse. "Still" zoom lenses often shift focus as they are zoomed in or out. This is true of many adequately expensive withal lenses as well as the lower priced ones. On the other mitt, true "cinema" class lenses demonstrate very trivial to no focus breathing or focus shift when changing the iris (aperture) or when zooming in or out. Such cinema lenses are much more expensive than even very high quality lenses made for shooting withal images.

The Rokinon 16mm T2.2 is such a "hybrid" lens as described in the video. It's got pretty adept glass, just it'southward nowhere nigh the same quality equally true cinema class lenses in terms of focus breathing or focus shift. Simply information technology has besides got the control interfaces that serious video shooters want - geared rings to control stepless apertures and focus via "video rigs."

Back to our regularly scheduled program: Rokinon uses the word "hybrid" in a unlike way when they draw one of the aspherical elements in the optical formula of the 16mm T2.ii as a 'hybrid aspherical element'.

From Wikipedia's Aspheric lens entry:

An aspheric lens or asphere is a lens whose surface profiles are non portions of a sphere or cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.

The asphere's more complex surface contour can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, compared to a simple lens. A single aspheric lens can often replace a much more than complex multi-lens arrangement. The resulting device is smaller and lighter, and sometimes cheaper than the multi-lens design.

Hybrid aspherical lenses combine the backdrop of refractive and diffractive lens elements in a unmarried lens element. A unmarried hybrid aspheric element may supplant several discrete elements, including conventional aspheres, in an optical formula. Again, though the cost to make a unmarried hybrid asphere may exist college than that of making a unmarried more uncomplicated element, the reduction in the full number of elements required oft saves manufacturing cost, materials cost, and can reduce the size/weight of a lens even equally optical operation is improved.

The Rokinon 16mm f/2 is an APS-C or micro four-thirds but lens. Based on the block diagrams published by Rokinon, the optical formula is identical to the 16mm T2.2 version with the hybrid aspherical chemical element for most mirrorless and micro 4/3 mounts, but not for the Canon EF, Nikon F, and Fuji Ten mounts¹.

_{Block diagram published by Rokinon for all versions of the 16mm T2.2}

_{Block diagram published by Rokinon for Pentax K, Sony α, Sony East, Samsung NX, Canon M (EF-M), and Micro 4/3 versions of the 16mm f/2}

_{Cake diagram published by Rokinon for Catechism (EF), Nikon AE (F), and Fuji X versions of the 16mm f/2}

Every bit can be seen by comparing the cake diagrams, the use of a single hybrid aspherical lens element has allowed the reduction of the utilise of elements fabricated from extra low dispersion glass from 4 elements to ane. ED glass tends to be more expensive as a material than standard optical glass. Hybrid aspherical elements tend to toll more to create from the cheaper raw material. Then the lens designers decided to commutation the material cost of three ED glass elements for the manufacturing cost of a unmarried hybrid aspherical element.

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Bold the same optical formula, the main difference betwixt the 16mm T2.two and the 16mm f/2 is in the housing and the control interfaces. The DS16M-C, which nosotros will refer to below equally the "cinematics" lens, is made primarily for shooting video footage. The 16M-C is made primarily for shooting still images. The 16M-C is currently priced about $230 less than the DS16M-C. We'll call the 16mm f/2 the "stills" lens, fifty-fifty though it can also exist used to shoot video. Being a manual just lens, though, shooting video with it would be problematic for annihilation that required changing the aperture or focus distance during a shot.

The discontinuity control for the cinematics lens is stepless. That means equally the aperture (iris) control is rotated the discontinuity tin be set at any value between the maximum T2.two value and the minimum T22 value. There are no 'clicks' to betoken a particular f-terminate or to hold the aperture ring at a specific f-stop. The aperture ring is like to a manual focus ring on virtually lenses - y'all can plow it smoothly from one stop to the other with no 'clicks' or 'stops'. You must use the index marking lined upwardly with the printed calibration on the side of the lens to select a specific aperture setting. There is a geared band at the rear of the aperture ring for use with external 'video rigs.'

The "stills" lens has clicks at the "full" and "half" f-end positions between f/2 and f/sixteen. There is no half stop click between f/16 and f/22. According to Bryan Carnathan's review of the Samyang version of the same lens at The-Digital-Pic, the discontinuity ring of the "stills' version can exist left in between clicks. At that place is no geared ring for attaching to external rigs. (Samyang makes lenses that are marketed by resellers as Rokinon/Bower/Walimex/Falcon/Albinar/Opteka/Quantaray/Bell & Howell/whatever else they're calling it this week.)

The focusing control is also different betwixt the ii lenses. Both are fully manual focus only. The "stills" lens has a fairly wide rubber focusing ring only no geared ring. The "cine" version has a patently plastic surface that includes a narrow geared ring that can exist used with optional external focusing rigs to enable more precise focusing control.

The older CV16M-C lacks the hybrid aspherical chemical element simply has all of the control features of the DS16M-C. The hybrid aspherical element gives a little better optical functioning on the edges and in the corners than the older lens without it.

¹Note: The description of the "stills" 16mm f/2 at Rokinon's U.S. website is a petty unclear every bit to whether it includes the hybrid aspherical element or not. The text description only says it has two aspherical elements. The block diagram indicates it is the same every bit the cake diagram shown for the DS16M-C when no specific mountain is selected. If one selects the Fuji X, Canon (EF), or Nikon AE (F) mounts the block diagram changes to a different formula. Selecting the Pentax K, Sony α, Samsung NX, Sony E, Micro 4/3, or Catechism Yard mounts shows the same cake diagram as the DS16 that has the hybrid aspherical element. Based on prices for the different mounts it's difficult to see a large difference between the Catechism (EF) mount, along with the Fuji X and Nikon mounts, which may be the older optical formula, and the other mounts which appear to exist the newer formula.

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Source: https://photo.stackexchange.com/questions/93398/what-is-the-difference-between-the-rokinon-16mm-f2-or-rokinon-16mm-t2-2-for-cano