Where can I browse photos taken with a specific lens before buying?

Yes—several sites can help you browse images shot with a specific lens. A dedicated option is PixelPeeper, which was built for exactly this purpose. You can also use major photo-sharing sites such as Flickr and 500px, where lens model searches often work because the lens information is stored in the image EXIF metadata. For example, searching a lens name on Flickr and filtering to photos can surface many examples taken with that lens. Another useful source is DPReview’s sample galleries, which include lens sample galleries.

A few cautions: results depend on the photographer’s skill, editing, subject, and lighting, so lens samples are best used to get a general feel for rendering, sharpness, and bokeh—not as a guarantee of what you’ll get. Also, some uploaded images may have missing or incorrect EXIF data, so searches won’t catch every relevant photo.