1. The focal length (for example, if you love to take a bird, you should consider whether the lens is telephoto to shoot the bird. If you take a picture, consider whether it is wide angle)
2. Aperture (for example, the shooting area is dim, or you need a shallow depth of field to highlight the subject)
3. Format support (including whether the frame is applicable, whether there will be black corners; whether the ring is corresponding; whether it can be automatically focused)
4. Special functions (such as shift mirror, macro lens or fish glasses)
5. Weight (Some lenses can't even be hand-held and must be supported by a tripod)
6. Price
After considering the above main factors, you may also consider the quality, appearance, brand and even other special features.
Finally, share with you a sentence: every photo is a specimen of time.
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