Are you an experienced writer with a passion for photography? Do you want to use your skills to contribute to the world's #1 photography website? If so, we want to hear from you. To expand on the reviews, previews and news stories that are the core of the site, we're looking for external contributors with a proven track record of producing top-quality content to deliver a diverse range of other articles. These include photographic technique tutorials, equipment buyers' guides, book reviews, and everything in between.

Just Posted: Our hands-on preview of the Olympus 75mm F1.8 for Micro Four Thirds. The 75mm is Olympus' premium grade portrait lens for the joint Olympus/Panasonic mirrorless system. We've had a pre-production example in the office for a couple of days and have prepared a hands-on preview, to which we'll add a samples gallery when the promised production example arrives.

Facebook has announced a free app called Camera that focuses on viewing and sharing photos. Instead of showing what your friends are doing and thinking, it just dives straight to their photo galleries. The app also allows you to share multiple photos at a time, including descriptions and tagging. There are also tools for cropping and applying filters to your images. The app allows Facebook to be used in a much more Instagram-like manner (and it seems too soon for this to be a product of the Facebook buyout). Updated with first impressions.

Olympus has released more details about the M.Zuiko Digital ED 75mm F1.8 lens it announced alongside the E-M5, back in January 2012. The relatively compact large-aperture lens offers a 150mm-equivalent field-of-view and a fast internal-focus design. The 75mm will be available from 'Summer 2012' at an expected selling price of around $899.99.

Fujifilm has officially unveiled its promised adapter to allow the use of Leica M-mount lenses on the X-Pro1. Unlike third-party versions, the adapter has electronic contacts for communication with the camera body, and a Function button that allows quick setting of the lens in use. To make full use of the adapter, a firmware update for the X-Pro1 (version 1.10) will be made available in June 2012. This will allow the user to create up to six lens profiles to correct distortion, vignetting and corner colour shading (in a similar manner to the Ricoh GXR Mount A12). The camera can show framelines in its unique hybrid viewfinder for 21mm, 24mm, 28mm, and 35mm lenses; for other focal lengths the electronic viewfinder or rear screen will show a preview with 100% coverage of the field of view.

We've added a hands-on video describing the features of the Pentax K-30 and explaining how it fits in alongside the K-01 and K-5. As it's a pre-production camera, we've not been able to demostrate the autofocus speed but we have included an example of the shutter sound when continuous shooting. Click here to see our Pentax K-30 preview video.

Apple has issued Digital Camera Raw Compatibility Update 3.13, adding compatibility for six extra cameras, allowing their Raw files to be opened by software on the Mac, including Aperture and iPhoto. The latest update brings support for the Canon EOS-1D X, Nikon D800E, Nikon D3200, Olympus OM-D E-M5, Panasonic Lumix DMC-GF5 and Sony SLT-A57. The update means Apple is the first major software maker to support some of these models.

Accessory maker NEX-Proshop has launched its ISO hotshoe adapter for Sony's NEX series of mirrorless cameras. The adapter screws into the NEX accessory port and adds a standard hotshoe and PC-Sync socket. It is designed for use with radio flash triggers (as the NEX accessory port is not designed to support a full-size flashgun), allowing much more flexible flash use with the NEX cameras. The adapter is available now for a cost of $79.99.

DxO Labs has updated DxO Optics Pro to v7.5, which now runs natively as a 64-bit application for both Mac and Windows. The latest version can handle larger images than previous versions - the 200 megapixel limit means the addition of D800 support prove no challenge. 60 of the extra 200 lens/camera profiles are for the Nikon. The latest version is available for free to existing DxO Optics Pro v7 users, with a 33% discount available for new customers until June 30th.

Just Posted: Our Canon EOS 5D Mark III review. The 22.3MP 5D Mark III appears to offer similar specifications to 2008's 5D Mark II. However, sensor and processing developments, along with a host of user-interface revisions mean the Mark III is a much more capable camera. It also gains a greatly-improved autofocus system. So do these changes justify the considerably higher price tag? Read our full review to find out.