Here's a breakdown to help you decide if it's a worthwhile investment for *your* style and needs:
Why the 70-200mm is Highly Regarded for Portraiture:
* Compression: This is the lens's biggest selling point for portraits. At longer focal lengths (135mm and beyond), the lens creates a flattering compression effect. This minimizes perspective distortion, making features like noses and foreheads appear less prominent and more harmonious. It also brings the background closer, creating a more intimate feel.
* Bokeh: The 70-200mm (especially with a wide aperture like f/2.8) excels at creating creamy, blurred backgrounds (bokeh). This helps isolate your subject and draw the viewer's eye to them. It removes distractions and enhances the visual appeal.
* Working Distance: You can maintain a comfortable distance from your subject. This is especially useful for photographing shy individuals or when you want to capture candid moments without being intrusive. It also allows you to shoot in tighter spaces where you can't physically move closer.
* Versatility: While primarily used for portraits, a 70-200mm can also be used for events, sports, wildlife, and even some landscape photography, making it a flexible addition to your kit.
* Full-Frame Equivalent: On a crop sensor camera, the effective focal length is even longer (e.g., 105-300mm on a 1.5x crop), providing even greater reach and compression.
Arguments Against Needing a 70-200mm:
* Cost: 70-200mm lenses, particularly those with a wide aperture (f/2.8), are expensive. It's a significant investment, especially for beginners.
* Size and Weight: These lenses are large and heavy. This can be tiring for long shoots, especially if you're shooting handheld. It's also less discreet than a smaller prime lens.
* Not Ideal for All Portrait Styles: If you prefer environmental portraits or tight headshots, a wider lens (like a 35mm or 50mm) might be more suitable.
* Alternative Options Exist:
* 85mm Prime: A popular choice for portraits, offering excellent image quality, a fast aperture, and a good balance of compression and working distance at a lower price point and smaller size.
* 135mm Prime: Similar to the 85mm but with even more compression and background blur, often preferred for headshots or when maximum bokeh is desired.
* Other Zoom Lenses: Some other zoom lenses cover useful portrait focal lengths, such as 24-70mm.
Factors to Consider When Deciding:
* Your Portrait Style: What kind of portraits do you shoot most often? Headshots, full-body shots, environmental portraits, candid shots?
* Your Budget: Can you afford a high-quality 70-200mm lens without breaking the bank?
* Your Gear Bag: Are you willing to carry a large and heavy lens?
* Your Shooting Environment: Do you often shoot in locations where you need the reach of a 70-200mm? Do you need to be able to create background separation in busy environments?
* Your Personal Preference: Do you like the look and feel of images taken with a 70-200mm lens?
In Conclusion:
A 70-200mm lens is *not* a necessity for all portrait photographers, but it's a highly valuable tool that offers unique benefits, particularly compression, bokeh, and working distance. If you can afford it and its size isn't a deterrent, it can elevate your portrait photography significantly. However, there are viable alternatives, such as 85mm or 135mm prime lenses, that can also produce excellent results.
My Recommendation:
* If you're just starting out: Consider an 85mm f/1.8 or f/1.4 lens as a more affordable and manageable entry point into portrait lenses.
* If you frequently shoot full-body or environmental portraits: You might not need the extreme reach of a 70-200mm. A 50mm or 35mm prime lens could be a better fit.
* If you want the best possible compression, bokeh, and working distance for headshots and full-body portraits: The 70-200mm is an excellent choice.
* Rent a 70-200mm lens before buying: This is the best way to experience the lens firsthand and see if it fits your shooting style and needs.
Ultimately, the best lens for you is the one that helps you achieve your creative vision and allows you to capture the types of portraits you want to create. Consider your style, budget, and shooting environment before making a decision.