1. Focal Length:
* 35mm:
* Pros: Wide field of view, suitable for environmental portraits (showing the subject in their surroundings), and works well in tight spaces.
* Cons: Can distort facial features if you get too close, requires careful composition to avoid making the subject appear small.
* Best for: Environmental portraits, street portraits, showing context and narrative.
* 50mm:
* Pros: Considered a "normal" focal length, close to how the human eye sees, versatile for various portrait styles, often affordable.
* Cons: May require more space to shoot full-body portraits compared to wider lenses.
* Best for: Headshots, half-body portraits, general-purpose use.
* 85mm:
* Pros: Creates beautiful subject isolation with shallow depth of field, pleasing compression (makes features appear more proportionate), flattering for facial features.
* Cons: Requires more space between you and the subject, may not be ideal in small studios or crowded locations.
* Best for: Classic portraits, headshots, emphasizing the subject's face, creating a dreamy background.
* 100mm - 135mm:
* Pros: Excellent compression, even stronger subject isolation than 85mm, flattering for portraits.
* Cons: Requires even more distance, can be challenging to use in tight spaces, may feel isolating for the subject.
* Best for: Tightly cropped portraits, studio work, creating a very shallow depth of field.
* 70-200mm (Zoom Lens):
* Pros: Versatile range for different portrait types (tight crops to full-body), allows you to adjust framing without moving, good for events and capturing candid moments.
* Cons: Typically larger and heavier than prime lenses, may not have as wide an aperture as a prime lens.
* Best for: Event photography, weddings, capturing a variety of portrait styles, situations where flexibility is important.
2. Aperture (f-stop):
* Wider Apertures (e.g., f/1.4, f/1.8, f/2.8):
* Pros: Create a very shallow depth of field (blurred background), excellent for subject isolation, perform well in low light.
* Cons: Narrow depth of field requires precise focusing, more expensive.
* Consider: Ideal for creating that classic portrait look with a blurry background.
* Narrower Apertures (e.g., f/4, f/5.6, f/8):
* Pros: Greater depth of field (more in focus), easier to achieve sharp images, useful when you want to show more of the background.
* Cons: Less subject isolation, requires more light.
* Consider: Useful for environmental portraits or when shooting in bright conditions.
3. Image Stabilization (IS) or Vibration Reduction (VR):
* Consider: Helpful for shooting handheld, especially in low light, can help you get sharper images at slower shutter speeds. Less critical if you always use a tripod or have a camera with good in-body image stabilization (IBIS).
4. Autofocus Performance:
* Consider: Fast and accurate autofocus is crucial for capturing sharp portraits, especially when shooting moving subjects. Look for lenses with a good autofocus system and silent operation.
5. Lens Sharpness:
* Consider: Sharpness is important, but it's not the only factor. Look for a lens that is sharp in the center and reasonably sharp at the edges, especially at wider apertures. However, sometimes a lens that is *too* sharp can exaggerate skin imperfections, so it's a balance.
6. Bokeh Quality:
* Consider: Bokeh refers to the quality of the out-of-focus areas in an image. A pleasing bokeh is smooth and creamy, without harsh edges or distracting shapes. Rounder aperture blades generally produce better bokeh.
7. Budget:
* Consider: Portrait lenses can range from affordable to very expensive. Set a budget and prioritize the features that are most important to you. Don't be afraid to consider used lenses – they can be a great way to save money.
8. Prime vs. Zoom:
* Prime Lenses: Fixed focal length, typically sharper, wider apertures, and often more affordable than zooms for similar quality.
* Zoom Lenses: Offer more flexibility in framing, convenient for various shooting situations, but can be larger and heavier.
How to choose:
1. Define Your Style: What kind of portraits do you want to take? Environmental, headshots, full-body? This will significantly narrow down your focal length options.
2. Consider Your Shooting Environment: Do you primarily shoot in a studio, outdoors, or a combination of both? Space limitations will influence your choice.
3. Set a Budget: Be realistic about how much you can spend.
4. Read Reviews and Compare: Research different lenses within your chosen focal length and budget range. Read reviews from reputable sources and compare specifications.
5. Rent Before You Buy (if possible): The best way to find the perfect lens is to try it out yourself. Rent a few different lenses and see which one you like best.
6. Prioritize the Key Factors: Based on your style and environment, prioritize the factors that are most important to you (focal length, aperture, sharpness, bokeh, autofocus, etc.).
Popular Portrait Lens Recommendations (Examples - prices vary greatly):
* Entry-Level:
* Canon EF 50mm f/1.8 STM
* Nikon AF-S 50mm f/1.8G
* Sony FE 50mm f/1.8
* Mid-Range:
* Sigma 50mm f/1.4 DG HSM Art
* Canon EF 85mm f/1.8 USM
* Nikon AF-S 85mm f/1.8G
* Sony FE 85mm f/1.8
* High-End:
* Canon RF 85mm f/1.2L USM
* Nikon NIKKOR Z 85mm f/1.2 S
* Sony FE 85mm f/1.4 GM
* Sigma 85mm f/1.4 DG DN Art
* 70-200mm f/2.8 zooms (Canon, Nikon, Sony, Sigma, Tamron)
Final Thoughts:
There is no single "best" portrait lens. The perfect lens is the one that best suits your individual needs and preferences. Take the time to research and try out different lenses to find the one that will help you create the portraits you envision. Don't be afraid to experiment and develop your own unique style.