[photo] A film crew on set on location in Tokofuji, Kyoto shooting an actress dressed in traditional Japanese attire under a wooden roof

Case Study

The MK Series Creates a New Digital Cinema World


Cinematographer Yoshihiro Enatsu tells what makes MK Series attractive.

[photo] A close up show of the Fujinon 50-135mm with a follow focus on the Sony digital camera

MK lenses will change the world of digital cinema. Once you use them you’ll notice their quality.

There are four reasons why I strongly feel the MK series of lenses opens a door to a new era. The first one is that they bear optical performance and mechanical structure that satisfies the demanding cinema standard. The second one is that they have superior image quality to many prime lenses. The third one is how compact and lightweight they are. The forth is their unbelievable price.
Firstly I would like to mention "optical performance and mechanical structure that satisfies the demanding cinema standard".


FUJINON Cine Lens "MK50-135mm" new lineup for MK series

Features of FUJINON MK series - New MK50-135mm

FUJINON quality with T2.9 throughout the entire zoom range

[photo] A medium view of a lady in traditional Japanese head gear and attire standing in a some dark room

Achieving T2.9 and superb optical performance throughout the entire zoom range, E mount MK series lenses are the next generation cinema zooms

One of the biggest differences between cinema and still lenses is the seamless iris. Most still lenses can only have their aperture value changed in 1/3 or 1/2 steps. The iris in cinema lenses can be changed linearly, giving maximum control to get the proper exposure. The MK series of lenses achieve T2.9 through the entire zoom range and their performance is superb - even at the widest aperture.

Perfect zooming with no focus or optical axis shift

[photo] Close up of the back focus adjustment on the MK Lenses

The MK lenses have back focus adjustment functions to ensure there is no focus shift while zooming in or out.

Decades of "FUJINON" technology is condensed into the MK series. Zoom lenses are much more difficult to design than primes - their performance has to be guaranteed at all zoom positions.

When using zoom lenses for still photography, the point of focus will shift while zooming, making it necessary to adjust the focus every time you change the zoom position. When it comes to shooting a movie, not only is it a requirement to focus check every single time the angle of view is changed, but scenes with any kind of zooming are unusable. This makes it a big burden, especially for documentary shooters.

The MK lenses are designed to suppress focus shift while zooming. Once a focus position is set, it will not shift even when the zoom position is changed. If you adjust the focus at the telephoto end, which is easier to see, you can then change the angle of view as you want and know that your focus point will not change at all.

[photo] One big circle and 4 smaller circles with wavy lines on a lens test chart
[photo] One big circle with wavy lines on a lens test chart

The MK lenses suppress optical axis shift. The center position will not move while zooming.

Optical axis shift is literary the “shift” of the center position while zooming from wide to telephoto. The MK lenses are designed to suppress this completely, ensuring that no re-framing is required after the angle of view is changed, and movies with zoom scenes do not show any imperfections in framing.

Suppressed lens breathing

[photo] Close up of green tree leaves in focus with a blurry background
[photo] Close up of a lady in traditional Japanese attire and headgear with foreground leaves out of focus

Minimum lens breathing allows for smooth focus control

Lens breathing, changes of the angle of view while focusing, occurs with almost all still lenses. While shooting a movie, the focus is often changed during a scene so breathing must be suppressed in order not to ruin it. Despite being zooms, the MK lenses suppress lens breathing incredibly well. This is due to the accurate lens design.

Superb cinema standard optical performance, condensed into a compact E mount body

[photo] A bottle of water next to the MK Series lenses on a black background

This is the comparison with plastic bottle. It's very compact, so lens support is often not necessary.

Despite weighing less than 1kg each and being very compact, the mechanical design of the MK series is completely to cinema specification, inherited from FUJINON’s PL mount HK, ZK and XK top cine lenses. By supporting the E mount, the MK lenses combine portability with high image quality, yet the operability is totally different from still lenses.

200° focus rotation angle

[photo] Close up view of a camera operator's hand on the focus ring of an MK Series lens

Smooth and accurate focus is achievable thanks to a 200° focus rotation angle

It is very easy to focus on subjects thanks to a 200° focus rotation angle. In most still lenses, the focus position angle is quite narrow making it is hard to focus on fine details. That's why some people rely on auto focus. The MK lenses are not only very accurate, but also have a great torque feeling.

0.8M standardized gear pitch

[photo] Very close up view of the standard gear pitch of the MK series lens

0.8 M is standard gear pitch for the cinema world, allowing you to easily attach accessories such as follow-focus systems.

The gear pitch for the iris, zoom, and focus rings are all 0.8M, allowing use of third-party cinema accessories. For still lenses, you often need to prepare other gear rings to attach follow-focus systems. Adding an additional gear ring causes focus operation to not be perfect since there is some clearance between the follow-focus and the ring. With the MK lenses, you're able to use cinema standard systems without any stress.

Open the new digital cinema world

Despite the appearance of cinema lens and still lens being similar, their design concepts are completely different. There are so many additional performance functions needed in real movie shooting location. In such an environment, the MK lens series will open up a new digital cinema world.