Description

In brief
Yongnuo 50mm 1: 1.(YN50mm F1.8N) is a very inexpensive fast nifty fifty lens from the Chinese manufacturer Yongnuo Digital. The lens copied the original Nikon 50/1.8G barrel design and the optical performance of the Yongnuo Lens EF 50mm 1: 1.In general, it is not bad. First of all Yongnuo YN50mm F1.8N is interesting to owners of Nikon D40, D40x, D60, D3000, D3100, D3200, D3300, D3400, D5000, D5100, D5200, D5300, D5500, D5600. You can try these out. For those who have a Nikon camera with a built-in focus motor, there is a remarkable and inexpensive Nikon 50/. 1.8D (as well as a million of its old sub-versions).

The creative and practical potential of this 50 mm lens is difficult to overestimate. It is suitable for a wide range of photo tasks. Photographers often use it as a portrait lens. A lot of them just want a high-speed fix, in addition to their kit lens. The aperture F/1.is 3.stops wider than the aperture F/5.6, which is used in the 'slow' kit lenses at 50 mm. In a numerical equivalent, this means that the Yongnuo 50mm 1:1.(YN50mm F1.8N) is times faster, for example than Nikon 18-55/3.5-5.kit lens (which uses a maximum relative aperture, equal to only 1:5.6, for 50 mm). Counting in the difference of the relative aperture is quite simple: (5.6*5.6)/(1.8*1.8) = 9.679, rounded to the value '10'.
History
The first lens from the company Yongnuo Digital was a nifty fifty lens for Canon EOS cameras - Yongnuo Lens EF 50mm 1:1.(YN50mm F1.8), presented on December 27, 2014.
On July 10, 201Yongnuo AF-S 50mm 1:1.(AF-S 50mm 1.8, for Nikon cameras) was introduced in Shanghai. The lens had the inscription 'AF-S', and the DOF scale was for F/2Near the filter thread was the designation 'YONGNUO AF-S 50mm 1.8', near the DOF scale was the designation 'AF-S 50mm 1:1.8'.
On May 7, 201the lens 'YONGNUO O58mm YN50mm F1.8' (without the designation 'AF-S', without the designation 'N' and with the DOF scale for F/16) was on sale. Most likely Yongnuo AF-S 50mm 1:1.was just a prototype, its optical scheme and the type of focusing motor will remain unknown.

After some time, the letter 'N' was added to the lens name ñ YONGNUO O58mm YN50mm F1.8N. 'N' is an abbreviation for 'Nikon', after which the lens took on the form shown in this review.
Assembly
The lens I got for a review was almost new. Before sending it to me, the owner has been using it only for a few days.
In a small box are the warranty card, instruction in Chinese and English languages and the lens itself with the front (YN-58) and the back cap. The box is made in the golden coloration style of the Nikon Nikkor lenses. What this lens did not have was the protective film on the front and back lenses, which originally comes with the lens.
The lens is not bad. It's nice that unlike the version of Yongnuo Lens of the EF 50mm 1:1.8, the Yongnuo YN50mm F1.8N version has a metallic bayonet mount.
The focus ring is rubberized. It is stated that the contacts of the microcircuits are gilded to improve the current flow.
Focusing

The lens has a built-in focus motor, so the Yongnuo YN50mm F1.8N will automatically focus on all Nikon digital SLR cameras, even on Nikon D40, D40x, D60, D3000, D3100, D3200, D3300, D3400, D5000, D5100, D5200, D5300, D5500, D5600.
To be extremely precise, the Yongnuo YN50mm F1.8N is the analogue of the Nikon AF-I series lenses. Unlike Nikon AF-S lenses that use Nikon SWM's ultrasonic focusing motors, the old Nikon AF-I lenses use the built-in buzzing micro-focus motors.
When focusing, the motor is making noise. Strangely, but the noise level is much lower than that of the Yongnuo Lens EF 50mm 1:1.lens. It's very good that the Yongnuo YN50mm F1.8N is noisier than the non-motor Nikon 50/1.8D. It is a pity though that it still cannot compare with a low level of noise from the ultrasonic motor Nikon 50 /1.8G.
The automatic focusing of the lens is fast enough. The autofocus speed is comparable to the Nikon 50/1.8G.

When used on a Nikon D90 camera (with a simple Multi-CAM 1000 focusing system), as well as on a Nikon D70 camera (with a super-simple Multi-CAM 900 focusing system), the lens behaves well and rarely has errors in focusing. I did not have any problems with precision and tenacity of focusing. In addition, I was pleasantly surprised by the quality of the focus. On the Nikon D90 I checked the presence of the back and front focus at different focusing distances (infinity and MFD including). As a measure, the photos were taken using the Live View mode (which does not suffer from the back/front focus). The accuracy of focusing using phase sensors completely coincided with the Live View mode.
I have a lot of experience with the Nikon 50 /1.8D lens. Therefore, I want to note that Yongnuo YN50mm F1.8N is not as confident as the original lens when it comes to focusing.
When focusing, the front lens group moves in the middle of the barrel frame. I can not say that the lens has an internal focusing. But, when focusing, the lens does not change its size. This type of focusing can be found in the Nikon 50/1.8G and Nikon 50/1.4G.
The focus ring is rubberized and rotates about 80 degrees. When the end positions are reached, the ring rests. The focus distance scale rotates in the opposite direction to the rotation of the focusing ring (this is the first I see!). Manual hitting is not very convenient. During manual focus, it is audible as 'plastic rubs against plastic'.
The lens housing has a focus mode switch 'AF/MF' (auto focus / manual focus). During autofocus, the focus ring remains stationary, while it can be freely rotated 360 degrees without any effect on focusing.
The lens has a window with a focus distance scale in meters and feet, as well as a DOF scale for F/1The minimum focusing distance is 4cm, and the maximum magnification ratio is 1:6.(typical figures for similar nifty fifty lenses)..

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