Here's a breakdown of why:
Arguments FOR a 70-200mm Lens in Portrait Photography:
* Compression: This is the biggest selling point. At longer focal lengths like 135mm, 150mm, or 200mm, the lens compresses the perspective, making the background appear closer to the subject. This can be very flattering, especially in environmental portraits. It minimizes distractions in the background and keeps the focus on the subject.
* Bokeh: The 70-200mm lenses (especially the f/2.8 versions) are known for creamy, beautiful bokeh (blurred background). This helps isolate the subject and create a visually appealing image. The longer focal length contributes significantly to shallower depth of field, enhancing the bokeh effect.
* Working Distance: Allows you to create distance between you and your subject. This can be helpful for:
* Candids: You can capture more natural expressions without making the subject feel self-conscious.
* Comfort: Some subjects are more comfortable when the photographer isn't right in their face.
* Shooting in Public: Easier to manage crowded environments and get a clean shot.
* Versatility: While primarily a portrait lens, the 70-200mm can also be used for:
* Events: Capturing candid moments and details at weddings or other events.
* Sports: Some sports photography, especially in well-lit conditions.
* Landscapes (compressed): Creating unique landscape images with compressed perspectives.
* Image Quality: Typically, 70-200mm lenses are built to a high standard, delivering excellent sharpness and clarity, especially at the center of the image.
Arguments AGAINST a 70-200mm Lens in Portrait Photography:
* Cost: High-quality 70-200mm lenses, especially those with a wide aperture (f/2.8), are expensive.
* Size and Weight: These lenses are large and heavy, which can be tiring during long shoots. They also aren't always inconspicuous.
* Indoor Use: Can be challenging to use in small indoor spaces due to the longer focal lengths. You need a larger area to maintain the desired composition.
* Alternative Lenses: Many other lenses can create beautiful portraits, including:
* 50mm: A versatile and affordable option. Requires you to get closer to the subject.
* 85mm: A classic portrait lens, offering a good balance between working distance and compression.
* 35mm: Great for environmental portraits and capturing a sense of place. Can introduce distortion if you get too close to the subject.
Alternatives and Considerations:
* 85mm Lens: Many photographers find an 85mm lens to be the sweet spot for portraiture. It offers a good balance of compression, bokeh, and working distance without being as bulky or expensive as a 70-200mm.
* Zoom vs. Prime: Consider whether you prefer the flexibility of a zoom lens or the potentially superior image quality and wider aperture of a prime lens.
* Shooting Style: Your preferred shooting style will heavily influence your lens choice. If you frequently shoot candids from a distance, a 70-200mm might be ideal. If you prefer interacting closely with your subject, a 50mm or 85mm might be a better fit.
* Budget: Factor in your budget. There are excellent affordable lens options available, particularly prime lenses.
Conclusion:
A 70-200mm lens is a fantastic tool for portrait photographers, offering excellent compression, bokeh, and working distance. However, it's not strictly necessary. Consider your budget, shooting style, and the types of portraits you want to create. You can achieve stunning portraits with a variety of lenses, including 50mm, 85mm, and 35mm options. The best lens is the one that best suits your individual needs and creative vision. Renting a 70-200mm to test it out before committing to a purchase is a good idea.