The Canon 20mm Sumire Prime T1.5 is a manual focus prime lens that covers full frame and Super 35 sensor formats providing center-to-edge resolution that supports 4K production. It features a PL mount and has focus scales marked in feet. The Sumire lens series is designed with the goal of creating pleasing facial close-ups across all ages, genders, and ethnicities. This effect is increased as the lens approaches its widest aperture. The 20mm offers a maximum T-stop of 1.5 and has an 11-blade iris that provides round natural-looking, out-of-focus highlights for a pleasing bokeh. The lens barrel features 300° smooth rotation from close focus to infinity, giving you a high degree of precision and consistent focus.

The lens is designed to minimize focus breathing. It offers focus distance markings on both sides of the barrel, with the rear markings on an angled surface, making it readable from either side of the camera. Some of the markings are done in phosphorescent paint, making them easier to see them in dim conditions. All lenses in the Sumire series share the same 114mm front barrel diameter, focus rotation, and focus and iris gear positions, allowing for easier lens swaps.

4K Cine Lens    Covers Full Frame & Super 35 Sensors    Nuanced Image Characteristics    T1.5 Maximum Aperture, 11-Blade Iris    Minimized Focus Breathing    Dual Focus Markings on Angled Surfaces    Same Gear Positions Among Sumire Primes

The Sumire Prime Lens series features a nuanced look as the lens aperture approaches its maximum setting. This subtly modifies the textural renderings of the human facial close-up and a pleasing bokeh.

The lens features a large-diameter aspheric lens and anomalous dispersion glass, for high-resolution image reproduction from image center to image edge. The lens produces warm color tones that help to softly capture facial expressions, and shares a unified color balance with other Canon Cinema lenses.

The 11-blade clickless iris produces artistic and beautiful out-of-focus areas, creating a more three-dimensional bokeh. The use of an odd number of blades helps reduce flaring of specular highlights.

The Sumire Prime Lens series features a unified front diameter (114mm), rotation angle (300°) and gear position on the focus and iris rings.

The focus and iris rings are designed to maintain a consistent amount of resistance and operating torque in order to help provide the camera operator or assistant with predictable lens operation.

Lens markings are displayed on both sides of the lens. To improve visibility in dim light conditions, indicator markings with phosphorescent paint have been adopted for the front barrel for right-side viewing.

All lenses in the series except the 14mm accept a 105mm diameter threaded filter in the front of the lens.

Related Questions and Answers

Q: 1. This is a 50mm on a full frame camera, so the field of view would be equivalent to a 70mm if used on a Super 35 sensor?

A: Yes, the field of view equivalent of the Rokinon XEEN CF 50mm T1.5 Pro Cine Lens (PL Mount) on Super 35mm is between 70-75mm. Every manufacturer plays around with their Super 35mm sensor dimensions.

Q: 2. Are the EF mounts active or passive? (i.e. are there electrical contacts for aperture info feedback or not?)

A: The Xeen lenses are entirely manual and do not have an electrical interface.

Q: 3. Would this lens do well for milky way and star photography compared to the Rokinon 24mm f/1.4 ED AS UMC Wide-Angle?

A: Hello JamesI have had direct experience filming and photographing in South America-Bolivia with 24mm lens Xeen is incredible image quality obtained with this lens, I recommend that the result beyond human vision.

Q: 4. I just want to know what's the difference between Rokinon Xeen 50mm T1.5 Lens and Rokinon Xeen 50mm T1.5 Pro lens. Why is the pro so expensive.

A: Difference Weight 32 oz vs 40.9 oz plus precise angular rotation of focus and Iris

Q: 5. Is this a rehoused photo lens or is this a newly designed lens for cinema?

A: its a cinema lens.

Q: 6. Is the front 95mm diameter threaded for filters?

A: This lens has a 95mm Front Diameter, it does not have a 95mm filter thread.

Q: 7. Its Macro or Makro lens?

A: he Rokinon XEEN CF 50mm T1.5 Pro Cine Lens is not a macro lens.

Q: 8. I just purchased a XEEN CF 50MM T.15 Ef Mount for my Red Gemini 5k. However, the lens ins't recognized by the camera so I don't get access to Aperture on the monitor nor do I get my focal points. Any suggestions or recommendations?

A: This is a fully manual lens. It does not communicate electronically.

Q: 9. I know this lens is built for full-frame but I'm curious about the coverage if adapted to the Fuji GFX mount. Extreme vignette?

A: Full frame lenses like the Rokinon XEEN CF 50mm T1.5 Pro Cine Lens (EF Mount) would have a bad vignette when mounted to a medium format camera like the Fuji GFX, as the image will not full cover the sensor.

Q: 10. Can lenses be changed over to other mounts?

A: There is no official manufacturer information regarding this. However, it is my opinion that the lenses can be converted. However, this should only be done by a qualified technician and not by a user in the field.