objectif 50 mm:
pros:
* polyvalence: A 50mm lens is a "standard" focal length, meaning it closely mimics human vision. This makes it versatile for various types of photography, not just portraits. You can use it for landscapes, street photography, and even some event photography.
* plus petit et plus léger: Generally smaller and lighter than an 85mm, making it more convenient to carry around.
* abordable: 50mm lenses, especially the f/1.8 versions, are often very affordable, making them a great entry point for portrait photography.
* champ de vision plus large: Allows you to capture more of the surrounding environment in your portraits. You can tell a story and show the subject in context.
* plus facile dans les espaces restreints: Better suited for smaller studios or shooting indoors where you don't have much space to move back.
* Moins de compression: Objects in the background appear closer to the subject, giving a more natural sense of depth.
contre:
* May Require Getting Closer: To get a tight portrait, you need to get closer to your subject, which might make some people feel uncomfortable.
* plus de distorsion: While not extreme, a 50mm can introduce some distortion, especially at the edges of the frame. This can be noticeable in portraits, potentially flattening facial features slightly.
* Moins de fond de fond (bokeh): While you can still achieve good background blur, it won't be as creamy or pronounced as with an 85mm, especially at similar apertures.
* Less Separation: Might not separate the subject from the background as effectively as an 85mm, especially in busy environments.
objectif 85 mm:
pros:
* Portrait idéal Longueur focale: Considéré par beaucoup comme l'objectif de portrait "classique".
* Excellente compression: Compresses the background, making it appear closer and creating a pleasingly blurred background (bokeh).
* Perspective flatteuse: Generally more flattering for facial features, minimizing distortion and making the subject look more attractive.
* Isolement de sujet fort: Separates the subject from the background effectively, drawing the viewer's eye to the person being photographed.
* Distance confortable: Allows you to maintain a comfortable distance from your subject while still getting a tight portrait.
contre:
* moins polyvalent: Primarily designed for portraits and not as well-suited for other types of photography.
* plus grand et plus lourd: Typically larger and heavier than a 50mm, making it less convenient to carry around.
* plus cher: Usually more expensive than a 50mm lens, especially fast aperture versions.
* nécessite plus d'espace: Not ideal for small studios or shooting in tight spaces, as you need more room to move back to get the full shot.
* Courbe d'apprentissage plus raide: Learning to frame effectively with the compressed perspective can take some practice.
Voici un tableau résumant les principales différences:
| Caractéristique | 50 mm | 85 mm |
|-----------------|------------------------------------|---------------------------------------|
| Polyvalence | Haut | Bas |
| Taille / poids | Smaller/Lighter | Plus grand / plus lourd |
| Prix | More Affordable | More Expensive |
| Distorsion | More (slight) | Moins |
| Blur en arrière-plan | Less (at same aperture) | Plus |
| Compression | Moins | Plus |
| Espace requis | Moins | Plus |
| Subject Distance| Plus proche | Further |
lequel devez-vous choisir?
* Choisissez 50 mm si:
* Vous voulez un objectif polyvalent pour divers types de photographie.
* Vous êtes sur un budget.
* You shoot in tight spaces frequently.
* You prefer showing the subject in their environment.
* You're new to portrait photography and want a lens that's easier to learn.
* Choisissez 85 mm si:
* You primarily focus on portraits.
* You prioritize subject isolation and background blur.
* You want a lens that is known to be flattering to facial features.
* You have the space to move around.
* You don't mind the larger size and weight.
Ultimately, the best way to decide is to try both focal lengths and see which one suits your style and preferences better. Renting a lens before buying can be a great way to test them out.
Autres considérations:
* Your camera sensor size: The effective focal length changes based on whether you're using a full-frame or crop sensor camera. Sur un capteur de récolte (APS-C), une lentille de 50 mm aura un champ de vue équivalent à environ 75 à 80 mm, le rapprochant du 85 mm sur un cadre complet. An 85mm on a crop sensor will be closer to 127.5mm, making it very tight.
* ouverture: The aperture (f-stop) of the lens is crucial for portraits. A wider aperture (e.g., f/1.4, f/1.8, f/2.8) allows for more background blur and better low-light performance.
In conclusion, both 50mm and 85mm lenses are capable of producing beautiful portraits. Consider your shooting style, budget, and environment to determine which focal length is the best fit for you. You might even find that you prefer both for different situations. Bonne chance!