For digital Slr Camera enter-level users, face the camera lenses is often confused. Not to mention the brand and type of the Lens is more than the digital Slr body, the Lens is a range of sizes and models, I often heard person told me to complain: I don't understand. So, how to understand a basic data of a Lens? genuinely we just need to know two data. First It is the focal length, the Second, it is aperture.
the first factor resolve whether it can be taken. For example, a digital Slr Camera bundled lens is a wide-angle lens. Use this lens, you want to narrow the gap between the distant scene is not possible, because its focal length is not enough. As an additional one example, you use a telephoto lens shoot habitancy at home, It also is not possible, unless your home is a large villa, a living room a few hundred square meters, in a small space, only the wide-angle lens can be inclusive under the wider perspective.
The cleft is different. It resolve whether the photo is good. Large cleft lens's cleft ordinarily is has a higher capability than smaller cleft lens, and the large cleft lens, shutting speed in low light or moved conditions (like shooting the car, game, etc.) will get best results. For example, if you have a large cleft lens, you can shoot a very natural and soft bokeh portrait photos. If your lens cleft is more smaller, You also can shoot photos, but the Photo is not so soft and natural.
Note, the fixed focus lens only have a label of focal and maximum aperture. For example, 50mm/F1.8, It means the focal is 50mm, maximum cleft is F1.8. But The zoom lens has a label with two focal length and maximum aperture. For example, Tamron 18-270mm F3.5-6.3, It means than the wide end of focal length is 18mm, maximum cleft is F3.5 and the telephoto focal length is 55mm, maximum cleft is F5.6.
