By using this adapter to attach any K-mount lens onto a PENTAX Q series camera, the focal length of the lens is extended by approximately 5.5 times in the 35mm format.

ENGADGET: Pentax launches Q10 interchangeable lens camera, K-5 II and K-5 IIs flagship DSLRs

The new FUJINON XF14mm (21mm) F2.8 single focal length lens offers a stunning, ultra wide angle that delivers exceptional resolution from edge to edge.

ENGADGET: Fujifilm grows X-series mirrorless lineup with 16.3-megapixel X-E1

Using a lens with too long a focal length, for instance, makes the image appear flat.

ECONOMIST: Animation takes on a whole new reality

With three glass lens elements in three groups, it can be used as a wide-angle lens equivalent with a single focal length of 30mm (35mm camera equivalent).

ENGADGET: Olympus E-PL5 and E-PM2: Micro Four Thirds cameras with OM-D-like focusing, performance boosts (hands-on)

TL34HD boasts an impressive resolution of 14.7 megapixels and renowned Schneider lens yielding a 28mm wide-angle focal length with 3.6x optical zoom.

ENGADGET: Samsung gets official with 14.7MP TL34HD point-and-shoot

Mastcam-34 has a 34mm lens, or a 35mm-equivalent focal length of 115mm.

ENGADGET: Life on Mars: One week of Curiosity Alt

The high-end Schneider lens offers a 24mm, ultra-wide focal length and 3x optical zoom.

ENGADGET: Samsung's PMA gifts: HD pocket camcorders, point-and-shoots with AMOLED screens

Featuring a powerful high-magnification optical 26X super-telephoto zoom lens, the new PENTAX X-5 provides photographers with a focal length of 4mm-104mm (22.3mm ultra-wide angle to 580mm super telephoto 35mm equivalent).

ENGADGET: Pentax intros X-5 superzoom camera with 26x lens, tiltable LCD

Offering a fixed 50mm focal length and extra-bright F1.4 aperture, the premium lens is an ideal choice for quality-critical portraiture and low-light shooting.

ENGADGET: Sony NEX-3N and Alpha A58 unveiled, heading to Europe this spring