Yongnuo YN 50 mm f/1.8 DF DSM Lens for Sony E
The Yongnuo YN 50 mm f/1.8 DF DSM is a fast full-frame prime lens engineered for cameras with the Sony E mount. Its classic 50 mm focal length combined with an f/1.8 maximum aperture delivers smooth background blur and strong performance in challenging low-light conditions.
Optical Design and Autofocus
The optical formula consists of 11 elements arranged in 8 groups, incorporating an aspherical element and an ultra-low dispersion lens to curb aberrations, along with nano-coatings to reduce flare. Autofocus is powered by a quiet, fast DSM stepping motor, complemented by a physical AF/MF switch on the lens barrel.
Build Quality and Control
Housed in an anodized aviation aluminum alloy body, the lens weighs just 395 grams. It features a durable metal bayonet with a rubber weather gasket, gold-plated electronic contacts for full EXIF data transmission, two customizable Fn buttons, and a USB-C interface for firmware updates.
| Model | Yongnuo YN 50 mm f/1.8 DF DSM for Sony E |
|---|---|
| Mount | Sony E |
| Image coverage | Full frame (35mm) |
| Focal length | 50 mm |
| Autofocus mechanism | DSM stepper motor |
| Diagonal field of view | 47.82° |
| Vertical field of view | 27.63° |
| Horizontal field of view | 40.23° |
| Minimum aperture | f/1.8 |
| Maximum aperture | f/22 |
| Optical design | 11 elements in 8 groups |
| Number of aperture blades | 9 |
| Minimum focusing distance | 0.45 m |
| Resolution scale | 0.15x |
| Filter diameter | 58 mm |
| Dimensions | ⌀6.8 x 8.5 cm |
| Weight | 395 g (without decks) |
| EAN | 6972810420078 |
|---|
What filter size does the Yongnuo YN 50 mm f/1.8 DF DSM use?
The lens accepts front screw-on filters and accessories with a 58 mm thread diameter.
How can the lens firmware be updated?
The lens features an integrated USB-C port, allowing firmware updates using files downloadable from the manufacturer's official website.
Is the lens mount weather-sealed?
The metal bayonet includes a rubber sealing gasket that protects against dust particles and light water droplets.
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