The PENTAX smc P-DA J 16-45mm F4.0 ED/AL is recommended for use with digital cameras. It features a 3X zoom ratio with focal lengths covering ultra-wide angle to normal ranges, incorporates a high-refraction extra low dispersion (ED) glass element to produce a high-resolution, high-contrast image with true-to-life color rendition, and aspherical lens elements to help transmit the light more efficiently through the lens to the film.

It’s a beautiful piece of glass–and for intimate or low-light portraits, fashion shots, and quick candid photographs with superior visual accuracy, this professional lens will satisfy the most uncompromising demands. Its performance at fully open aperture is astonishingly precise–and its 35mm-equivalent 125.7mm focal length gives you sharp midrange close-ups and natural, distortion-free portraits at relaxed distances.

The lens features 8 aperture blades. The filter size is 67mm. The Canon EF 70-200mm F4L USM is pretty compact for a moderate aperture tele zoom with a size of 76x172mm and a weight of 705g so unlike its f/2.8 brothers and sisters it doesn’t feel like a brick in your camera bag. Adding the barrel-shaped hood increases the length substantially.

Canon EF 17-40mm f 4L is considered as one of the best selling Canon lenses because aside from the fact that this ultra wide angle zoom lens is not so expensive as the other models, it also offers extremely high quality images. Canon EF 17-40mm f 4L is considered as the lightest and smallest L lens currently manufactured.