Here's a breakdown to help understand why:
Arguments for needing a 70-200mm lens for portrait photography:
* Compression: The biggest reason. Longer focal lengths compress perspective, making backgrounds appear closer and more blurred. This can be hugely flattering to the subject, minimizing distracting background elements and creating a shallow depth of field (bokeh) that isolates the subject.
* Distance: Allows you to maintain a comfortable distance from your subject, especially useful for:
* Candid shots: Capturing natural expressions without intruding on their personal space.
* Shy subjects: Making them feel less self-conscious.
* Outdoor portraits: Separating the subject from a complex or busy background.
* Controlling shadows in bright sun: Positioning yourself and the subject to get more even lighting.
* Versatility: The zoom range is incredibly useful. You can quickly switch between headshots (200mm) and environmental portraits (70mm) without changing lenses.
* Bokeh: Typically, 70-200mm lenses have wide maximum apertures (f/2.8 or f/4), which, combined with the longer focal length, create beautiful, creamy bokeh.
* Sharpness: Many 70-200mm lenses are known for their sharpness, which is crucial for capturing fine details in portraits.
Arguments against needing a 70-200mm lens for portrait photography:
* Cost: Good 70-200mm lenses are expensive. This can be a significant barrier for beginners or photographers on a budget.
* Size and Weight: These lenses are often large and heavy, making them less convenient to carry around and potentially tiring to use for long shoots.
* Space Requirements: You need room to move back from your subject, which can be challenging in smaller studios or indoor locations. This is especially true at 200mm.
* Alternatives: Other lenses can be used for portraiture, and some photographers prefer them for specific styles:
* 50mm: A "nifty fifty" is affordable, lightweight, and can produce beautiful results, especially in well-lit environments.
* 85mm: Often considered a classic portrait lens, offering a good balance of compression and working distance.
* 35mm: Useful for environmental portraits, showing the subject in their context. Can be used for tighter shots, but requires getting closer.
* Personal Style: Some photographers prefer a wider field of view, getting closer to their subjects and creating a more intimate or documentary-style feel. The 70-200 might not align with that aesthetic.
Here's a breakdown of situations where a 70-200mm lens shines:
* Outdoor portrait sessions: Excellent for isolating subjects from distracting backgrounds, creating shallow depth of field, and working in varying light conditions.
* Event photography: Capturing candid portraits of people at weddings, parties, or other events.
* Studio portraits: Provides flexibility for different compositions and can create flattering results. (But studio space is a constraint)
* Working with shy subjects: Allows you to keep your distance and make them feel more comfortable.
When other lenses might be better:
* Indoor portraits in tight spaces: A shorter focal length lens like a 35mm, 50mm, or 85mm might be more suitable.
* Budget constraints: A good 50mm or 85mm lens is a more affordable option.
* Travel photography: A smaller, lighter lens is more practical for travel.
* Specific artistic vision: A wider lens might be preferred for certain styles.
Conclusion:
A 70-200mm lens is a *fantastic* portrait lens, offering versatility, compression, beautiful bokeh, and the ability to work from a distance. However, it's not a *requirement*. Consider your budget, shooting style, typical shooting environments, and the type of portraits you want to create. Experiment with different focal lengths and see what works best for *you*. If you are serious about portrait photography and have the budget, a 70-200mm should be high on your list. If you are starting out, other lenses may be better for your budget and needs.