Here's a breakdown to help understand why:
Why the 70-200mm is Popular for Portraits:
* Compression: One of the key reasons is the compression it offers, especially at longer focal lengths. Compression visually shortens the distance between the subject and the background, making backgrounds appear larger and closer. This can simplify busy backgrounds and create a more flattering look for the subject's features.
* Bokeh (Background Blur): The 70-200mm, especially with a wider aperture (f/2.8 is ideal), produces beautiful, creamy bokeh. This helps isolate the subject and creates a professional, polished look.
* Working Distance: It allows you to stand further back from your subject. This can make them feel more comfortable and relaxed, leading to more natural expressions. It's especially useful for shy or self-conscious subjects. It also allows you to fill the frame without being intrusive.
* Versatility: It's not just for headshots. You can use it for full-body shots, environmental portraits, and even capture candid moments without being right in the subject's face. The zoom range is useful in varied environments.
* Sharpness: Most 70-200mm lenses, especially the higher-end ones, are exceptionally sharp. This sharpness translates to detailed and visually appealing portraits.
* Available Light Performance (If f/2.8): An f/2.8 aperture allows for shooting in lower light situations while still maintaining a shallow depth of field.
Reasons Why You Might Not *Need* a 70-200mm:
* Cost: High-quality 70-200mm lenses are expensive. They are a significant investment.
* Weight and Size: They are large and heavy, which can be tiring to carry around for extended periods. This can be a limiting factor for some photographers.
* Indoor Space Constraints: In small studios or tight indoor spaces, the 70-200mm can be unwieldy. You may not have enough room to move back far enough to get the desired shot.
* Alternative Options: There are other lenses that can produce excellent portraits, such as:
* 85mm: Often considered a classic portrait lens. It offers excellent bokeh and a flattering perspective. It is usually smaller, lighter, and more affordable than a 70-200mm.
* 50mm: A versatile lens that can be used for portraits and other types of photography. It's often relatively inexpensive and performs well in low light. Requires you to be closer to your subject.
* 35mm: Excellent for environmental portraits where you want to include more of the background and context. Requires you to be closer to your subject.
* Medium Format lenses: If you shoot medium format, the focal lengths will be different to achieve a similar effect.
* Your Style of Photography: If you primarily shoot wide environmental portraits or prefer to get up close and personal with your subjects, a 70-200mm might not be the best choice.
So, How Do You Decide?
Consider these factors:
* What types of portraits do you shoot? (Headshots, full-body, environmental, studio, outdoor, etc.)
* What is your budget?
* How important is portability to you?
* What kind of look do you want to achieve in your portraits? (Bokeh, compression, etc.)
* What lenses do you already have?
Recommendations:
* If you're just starting out: Begin with a more affordable and versatile lens like a 50mm or 85mm. Gain experience and see what you need before investing in a 70-200mm.
* If you have the budget and shoot a variety of portraits: The 70-200mm f/2.8 is an excellent investment that will likely become a workhorse lens.
* If you primarily shoot in small spaces: A 50mm or 85mm may be a better choice.
* Rent before you buy: Rent a 70-200mm lens for a weekend to see if it fits your shooting style and workflow.
In conclusion, the 70-200mm is a powerful and versatile lens for portrait photography, but it's not a necessity for everyone. Evaluate your individual needs and preferences before making a decision. Consider your shooting style, budget, and the type of portraits you create. You can create amazing portraits with many different lenses!