General Recommendations (Balancing Price and Performance):
* Canon EF 50mm f/1.8 STM: This is an absolute classic for Canon users. It's incredibly affordable and offers great image quality. It's sharp, lightweight, and has a fast aperture for beautiful bokeh. However, autofocus can be a bit noisy.
* Nikon AF-S Nikkor 50mm f/1.8G: Similar to the Canon above, this is a great entry-level option for Nikon. It's sharp, offers good bokeh, and is compact. It's an excellent value for the money.
* Sony FE 50mm f/1.8: Another affordable option for Sony full-frame users. It provides good image quality and a fast aperture for portraits. Again, it's not the *most* advanced, but excellent for the price.
* Fujifilm XF 50mm f/2 R WR: For Fujifilm users, this lens offers excellent image quality, weather resistance, and compact size. It's known for its sharpness and pleasing bokeh, making it a great choice for portraits.
Mid-Range (Better Build, Autofocus, and Image Quality):
* Sigma 50mm f/1.4 DG HSM Art: Available for Canon, Nikon, Sony, and other mounts, the Sigma Art 50mm is renowned for its sharpness, beautiful bokeh, and excellent build quality. It's a step up in performance compared to the f/1.8 versions, offering a more professional look. It's bigger and heavier, though.
* Sony FE 55mm f/1.8 ZA: A very popular lens for Sony full-frame users. It's known for its sharpness, compact size, and excellent performance. It's a bit pricier than the f/1.8, but the image quality is noticeably better.
* Nikon AF-S Nikkor 50mm f/1.4G: Offers faster autofocus and a wider aperture than the f/1.8G. This can be helpful in low light and for achieving shallower depth of field. The build quality is also better.
High-End (Premium Performance, Price, and Features):
* Canon RF 50mm f/1.2L USM: For Canon RF mount users (mirrorless), this lens is considered one of the best 50mm lenses available. It's incredibly sharp, has beautiful bokeh, and a fast f/1.2 aperture. It's expensive and quite large, but the image quality is exceptional.
* Sony FE 50mm f/1.2 GM: Sony's flagship 50mm lens. It offers incredible sharpness, beautiful bokeh, and fast, reliable autofocus. It's expensive and large, but the performance is top-notch.
* Nikon NIKKOR Z 50mm f/1.2 S: The flagship 50mm for Nikon Z mount (mirrorless) cameras. This lens delivers stunning image quality, with exceptional sharpness, beautiful bokeh, and excellent low-light performance.
* Voigtlander Nokton 50mm f/1.2 Aspherical: For those who prefer manual focus, this lens offers exceptional image quality and a unique rendering. It's known for its sharpness, smooth bokeh, and classic feel. Available for various mounts, including Sony E-mount.
Key Considerations When Choosing:
* Aperture: A wider aperture (e.g., f/1.2, f/1.4, f/1.8) allows more light into the camera, enabling faster shutter speeds in low light and creating a shallower depth of field for a blurred background ("bokeh").
* Sharpness: While sharpness is important, it's not everything for portraits. Some lenses are *too* sharp and can reveal too much detail. Consider lenses known for a flattering rendering.
* Bokeh: The quality of the bokeh (the out-of-focus areas) is crucial for portraiture. Look for lenses that create smooth, creamy bokeh.
* Autofocus: If you're shooting moving subjects, fast and accurate autofocus is essential.
* Build Quality: A well-built lens will last longer and be more durable.
* Budget: Set a budget before you start shopping to narrow down your options.
* Camera System: Ensure the lens is compatible with your camera's mount (e.g., Canon EF, Nikon F, Sony E, Fujifilm X).
* Manual vs. Autofocus: Manual focus lenses require you to focus manually. This can be slower but allows for more precise control. Autofocus lenses focus automatically, which is faster and easier.
* Image Stabilization: Some lenses have image stabilization (IS) or vibration reduction (VR), which helps reduce camera shake, especially in low light. While less critical on a 50mm than a longer lens, it can still be useful.
* Character/Rendering: Different lenses have different "character." Some are very clinical and sharp, while others have a softer, more dreamy look. Consider the style you're going for.
To help me give you a more specific recommendation, please tell me:
* What camera system do you use (Canon, Nikon, Sony, Fujifilm, etc.)?
* What's your budget?
* What kind of portraits are you planning to shoot (e.g., headshots, full-body, indoor, outdoor)?
* What are you looking for in a lens (e.g., sharpness, bokeh, autofocus speed, build quality)?
Once I have this information, I can provide a more tailored recommendation. Good luck!