Yongnuo 85mm f1.8 đánh giá

Yongnuo vừa giới thiệu chiếc ống kính với tiêu cự 85mm, khẩu độ f/1.8, ngàm EF cho máy ảnh Full frame Canon. Đây là chiếc ống kính với tiêu cự chân dung 85mm mới nhất của Yongnuo tiếp nối thành công của các dòng ống kính giá rẻ khác của mình như: 35mm, 50mm và 100mm cho Canon, cũng như các ống 50mm f/1.8 và 35mm f/2 cho Nikon trước đó.

Thông báo chính thức đã được đăng trên trang Fanpage chính thức của Yongnuo, nhằm kêu gọi mọi người xem qua những hình ảnh đã được chụp và test của họ cũng như cung cấp thêm về những bản test chi tiết hơn cho những ai cần. Ngoài ra, trong đợt này Yongnuo còn mở rộng ra hơn bằng cách tổ chức một cuộc rút thăm nhỏ dành cho 3 người may mắn nhất hội đủ điều kiện của họ đưa ra và sẽ cung cấp cho mỗi người may mắn 01 ống kính thử nghiệm hoàn chỉnh nhất của chiếc YN 85mm F1.8 C, để có thể trải nghiệm và chia sẽ theo cách của mình cho mọi người.

Về ngoại hình bên ngoài của chiếc YN 85mm ta có thể thấy nó mang rất nhiều điểm giống với chiếc ống kính Canon EF 85mm f/1.8 USM, với khối lượng hơi nặng hơn 1 ít, cỡ 460g, có thể được gia công với nhiều thành phần thấu kính hoặc thấu kính lớn hơn.

Ống kính YN 85mm F1.8 C có cấu tạo quang học với 9 thấu kính gom trong 6 nhóm, khẩu độ đóng nhỏ nhất F18 so với khẩu độ đóng F22 trên chiếc Canon 85mm F1.8, khoảng cách lấy nét gần nhất khoảng 85cm, góc nhìn hơi lớn hơn 1 tý với 28.5°, ngàm ống kính được gia công bằng kim loại chắc chắn với các chấu tiếp xúc được mạ vàng.

Chiếc ống kính này được ra mắt với bản dành cho ngàm EF của Canon qua hình ảnh có chân tiếp xúc của Canon như trong hình, chưa có thông tin gì về phiên bản 85mm F1,8 dành cho Nikon từ hãng, nhưng có khả năng phiên bản dành cho Nikon sẽ sớm được ra mắt theo như lộ trình ra mắt của Yongnuo từ trước đến nay.

Về giá bán, giống như các dòng ống kính khác cho Canon của Yongnuo, ống kính 85mm f/1.8 mới này mang lại một sự lựa chọn mới để tiết kiệm khá nhiều chi phí: 176.99 USD tại BHphoto trong khi đó chiếc ống kính Canon 85mm f/1.8 của Canon đang được bán với giá 369USD sau khi đã giảm giá 50 USD.

Chiếc YN 85mm F1.8 sẽ bắt đầu được bán ra vào tháng 3-2017 sắp tới. Hiện tại đã được cho đặt trước tại BHphoto, Amazon và Ebay.

There’s a growing rank of ‘dumb’ fully manual lenses for Nikon Z system cameras from independent manufacturers. They lack any electronics and therefore can’t communicate with the camera body, so there’s no autofocus, you have to set the aperture manually and there’s no EXIF data stored with images. This Yongnuo is entirely different, not only featuring autofocus but also boasting a customizable L-Fn (Lens function) button and customizable control ring. Its 85mm focal length and fast f/1.8 aperture make it ideal for portraiture and still life photography. As well as the Nikon Z edition, it’s also available in Sony E-mount, and it’s a standout bargain at the price.

Pros

• + Desirable focal length and aperture
• + Customizable controls
• + Quick, virtually silent autofocus

Cons

• - Poorly rounded aperture
• - Noticeable lateral chromatic aberration
• - Imprecise manual focusing

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The Yongnuo YN85mm F1.8 DF DSM was originally designed for Sony E-mount mirrorless camerasand is now also available in a Nikon Z mount, and for Canon RF. The popular focal length and aperture combination of 85mm and f/1.8 enable a compact and lightweight build, while giving a short telephoto field of view and tight depth of field on full-frame cameras, ideal for portraiture and still life. As such, it goes head to head with the Canon RF 85mm F2 Macro IS STM and Nikon Z 85mm f/1.8 S, but at around half the price.

Specifications

Mount: Nikon Z, Sony E (FE), Canon RF Full-frame: Yes Autofocus: Yes Stabilization: No Lens construction: 9 elements in 8 groups Angle of view: 28.8 degrees Diaphragm blades: 7 Minimum aperture: f/16 Minimum focusing distance: 0.8m Maximum magnification ratio: 0.13x Filter size: 58mm Dimensions: 67x88mm Weight: 346g

Key features

We’ve seen plenty of fully manual lenses for Canon EOS R and Nikon Z system cameras from the likes of 7Artisans, Laowa, Samyang and more besides. Most deliver good image quality but are comparatively short on features. This Yongnuo lens is altogether different, with a feature set that rivals own-brand lenses costing around twice the price.

Autofocus is driven by a near-silent digital stepping motor and there’s a large manual focus control ring, although it lacks the precision that’s usually afforded by this type of system. Naturally though, being an ‘autofocus’ lens, you might seldom or never resort to manual focusing, given the accuracy of autofocus with current mirrorless cameras. A better option is to customize the control ring to perform other functions when in autofocus mode, like stepless aperture adjustment, ISO and exposure compensation. A physical AF/MF switch avoids the need to delve into camera menus to change modes.

The Yongnuo features an AF/MF switch along with a customizable focus control ring and function button. (Image credit: Matthew Richards)

Even more remarkably at this price point, the Yongnuo also features a lens function button, which again is customizable via camera menus for operations like AF on/hold, exposure lock and more besides, depending on the host camera. The lens also features a USB C socket, which can be used for applying firmware updates. However, it lacks optical stabilization, which owners of first-generation Canon EOS R and Sony A7 cameras might find a problem. The same goes if you’re using the lens on the DX format Nikon Z 50 or Z fc.

Build and handling

The lens feels well built despite its budget price tag, and features a weather-seal gasket on its chrome-plated mount. The electronic connections are gold-plated and the optical layout includes one LD (Low Dispersion) element and one HR (High Refractive index) element. Nano-structure coatings are also applied to minimize ghosting and flare.

Beneath a weather-seal cap on the underside of the barrel, towards the rear, there’s a USB C socket which can be used to apply firmware updates. (Image credit: Matthew Richards)

Our only complaints about the build and handling are that the aperture is based on just seven diaphragm blades and isn’t particularly well rounded, and that the focus control ring rotates a little too freely, with little feedback.

Performance

Autofocus speed is pretty nippy but not massively fast, and the stepping motor is whisper-quiet. Levels of sharpness are absolutely outstanding, even when shooting wide-open at f/1.8. Meanwhile, bokeh is pleasantly soft at f/1.8 and remains of good quality when stopping down a little, despite the aperture diaphragm only having seven blades.

‘Fast’ lenses often exhibit longitudinal/axial chromatic aberration, also known as bokeh fringing but the Yongnuo does very well in this respect. As such, color fringing around outlines just in front of or behind the point of focus is negligible. Lateral chromatic aberration is more problematic, especially at narrower apertures, but can largely be taken care of with automatic in-camera corrections.

Sample images

Image 1 of 5

EXIF: Nikon Z 7II + Yongnuo YN85mm F1.8 DF DSM (1/1250 sec, f/1.8, ISO200)(Image credit: Matthew Richards)

This sequence of shots shows how the depth of field and bokeh changes at apertures of f/1.8, f/2, f/2.8, f/4 and f/5.6.

EXIF: Nikon Z 7II + Yongnuo YN85mm F1.8 DF DSM (1/160 sec, f/1.8, ISO200) Longitudinal/axial chromatic aberration or ‘bokeh fringing’ is negligible even when shooting at the widest aperture of f/1.8. (Image credit: Matthew Richards)

EXIF: Nikon Z 7II + Yongnuo YN85mm F1.8 DF DSM (1/30 sec, f/8, ISO200) (Image credit: Matthew Richards)

Lab results

We run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of test charts are taken across the range of apertures and zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations.

We use Imatest SFR (spatial frequency response) charts and analysis software to plot lens resolution at the center of the image frame, corners and mid-point distances, across the range of aperture settings and, with zoom lenses, at four different focal lengths. The tests also measure distortion and color fringing (chromatic aberration).

Sharpness:

(Image credit: Future)

Even wide-open at f/1.8, sharpness is exceptional across nearly the whole image frame, and still holds up very well at the extreme edges and corners. Indeed, the lens is sharpest everywhere but the center of the frame at its widest aperture.

Fringing:

(Image credit: Future)

Axial/longitudinal chromatic aberration is minimal even wide-open but lateral chromatic aberration can be more noticeable towards the edges and corners of the frame, becoming worse as you stop down through the aperture range. Automatic in-camera correction comes in useful.

Distortion: 1.64

There’s a touch of pincushion distortion but it’s of a very low order and easily corrected if necessary, either automatically in-camera or manually at the editing stage.

Verdict

There’s a growing rank of ‘dumb’ fully manual lenses for Nikon Z system cameras from independent manufacturers. They lack any electronics and therefore can’t communicate with the camera body, so there’s no autofocus, you have to set the aperture manually and there’s no EXIF data stored with images. This Yongnuo is entirely different, not only featuring autofocus but also boasting a customizable L-Fn (Lens function) button and customizable control ring. Its 85mm focal length and fast f/1.8 aperture make it ideal for portraiture and still life photography. As well as the Nikon Z edition, it’s also available in Sony E-mount, and it’s a standout bargain at the price.

Read more:

• Best camera lenses to get • Best Canon RF lenses • Best Nikon Z lenses • Best Sony lenses

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Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners!

His expertise with equipment doesn’t end there, though. He is also an encyclopedia when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related.