British newspaper The Guardian is known for its editorial photography, but like all working pros, the staff photographers sometimes only get a few minutes to capture their subjects. In an article posted on the Guardian's Photo Blog, several of the paper's photographers share their tips for getting portraits in a hurry. Click through for some pictures, and a link to the article at guardian.co.uk.

The National Geographic Society continues to celebrate its 125th anniversary, and has launched a Tumblr blog called 'Found', which hosts a curated collection of photos from the National Geographic archives. The curation is done by Nat Geo's William Bonner who has been scanning through the company's extensive photography archive in the basement of its Washington, D.C. headquarters. Click through for more information and some fascinating photos.

We have added DxOMark's Mobile Report to our camera review of the Nokia Lumia 920. The report includes DxO Lab's usual industrial-quality scientific measurements and analyzes 14 aspects of mobile imaging including detailed image quality assessment, flash performance, autofocus reliability and more to calculate a final score. Click through to read our Nokia Lumia 920 review and turn over to page 2 for the DxO Mark mobile report.

Nissin's UK distributor Kenro has announced the Di700 flashgun and the PS 8 external battery pack for Canon, Nikon and Sony digital SLRs. With a guide number of 50 (at 200mm), the Di700 is equipped with an external power socket making it compatible with the PS 8. The battery pack offers a heat-resistant plastic body, a USB socket for charging and an LED indication lamp. The PS 8 is available for £165 (including VAT), while the Di700 will be available from April 2013 at a price to be confirmed. There is currently no information about US price and availability.

Sigma US has announced the price and availability for its three latest 'Art' series prime lenses - the 19mm f/2.8 DN and 30mm f/2.8 DN for mirrorless cameras, and the 30mm f/1.4 for APS-C DSLRs. The DN lenses will be available for street price of $199 and the redesigned 30mm f/1.4 will be available in Canon, Nikon and Sigma mounts for $499. All three will start shipping from the end of this month. No details were given about the 60mm f/2.8 lens also announced during the CP+ tradeshow.

ACD Systems has extended the Raw support offered by its ACDSee Pro 6 and ACDSee 15 software packages. Version 6.2 of the Pro version and and ACDSee v15.2 gain support for an additional 19 cameras including the Canon EOS M, Nikon D5200, Sony SLT-A99V and the Olympus E-PL5. This update also includes performance improvements. Click through for more information.

Photo District News (PDN) recently released its annual list of 30, 'new and emerging photographers to watch'. The portfolios of these commercial, fashion and editorial photographers from around the world were selected from more than 300 submissions made by industry professionals. Their work will be published in the magazine's April issue, providing valuable exposure in the US for these photographers as they seek to establish careers in print and online media.

Facebook has announced an upcoming update to the way photos are presented in user News Feeds. More space will be devoted to images, displaying them more prominently on the page. This is the second redesign that focuses on bigger pictures since July last year. The result of the redesign is not too dissimilar to Google+. In addition, the News Feed can be filtered to view only photo-based updates. The company says it is rolling the changes out in the coming weeks to both desktop and mobile version.

Users looking for their Picasa Web Albums are now redirected to Google+ Photos. This change comes on the heels of Google's announcement in December 2012 saying the company's social media channel 'Google+ is the new home for your photos.' Two updates to Picasa's desktop app also promoted Google+ integration, encouraging users to tag photos with Google+ contacts and Circles. Click through for more information and to find out how to still access your pictures on Picasa.

Sekonic's Lightmaster Pro L-478D and L-478DR touch-enabled lightmeters are now available as part a $512 special edition bundle that also includes X-Rite's ColorChecker Passport and White Balance Target. This offer is currently only available for US customers, who will save $50 compared to buying everything individually. The bundle also includes software to calibrate the meters and create exposure profiles for cameras. Current L-478D/DR owners can purchase the ColorChecker Passport and gray card for $49.

Just posted: Our review of Canon's top-end standard zoom, the EF 24-70mm f/2.8L II USM. Launched a year ago to replace its 10-year old predecessor, it's designed as a workhorse for professional photographers, and features a completely new optical design and improved, weathersealed build. In the latest of our lens reviews produced in collaboration with DxOMark, we take a look both lab and real-world performance. As usual, you can also compare it to a wide range of similar lenses using our unique lens data widget. Click through to see what we thought.

A dispute between Canadian pro photographer, Barbara Ann and Ottawa radio station HOT 89.9 illustrates the problematic climate in which companies often turn to the Internet for free photographic images. Someone at the radio station found, via a Google search, a wedding photo that was then used as part of a Keynote slide presentation made to potential advertisers. When contacted by the photographer, the station removed the image but the two parties remain far apart on an agreement over compensation. (via PetaPixel)

Panasonic has announced firmware updates for its Lumix DMC-GH3 high-end movie-focused mirrorless camera, the 14-42mm and 45-175mm power zooms and the 45-150mm. The GH3 update will allow users to connect to a computer via Wi-Fi by entering the computer name (NetBIOS names for Mac). It also adds an MP4 1080p60, 28Mbps mode to video recording. Meanwhile the lens updates promise improved autofocus performance in AF Continuous mode when mounted on the GH3. The updates will be available at the end of this month.

US photographic trade body PMA and dpreview.com are conducting a survey looking for the views of dedicated amateur photographers. The survey asks about your photographic habits, the features you'd like to see in cameras and your use and experience of photo sharing sites and printing services. We're aiming to get a clearer understanding of what committed non-professional photographers want from their cameras and related services and your answers may even result in those things getting a bit better - including dpreview.com. Responses will be discussed at this year's 6Sight conference. As an incentive, one lucky respondent will be sent a shiny new Apple iPad with Retina Display.

Fujifilm UK has given more details of the upcoming XF 55-200mm F3.5-4.8 R LM OIS telephoto zoom for its X system cameras. Full specifications include an inner focusing system driven by no fewer than four linear stepper motors, and a promise of class-leading OIS with four to five stops correction, to go alongside the maximum aperture that's half a stop faster than typical SLR lenses covering the same range. The company says the lens will be available in May 2013. Meanwhile the promised XF 23mm F1.4 R and XF 27mm F2.8 R pancake are expected to appear in the middle of the year, and the XF 56mm F1.4 R and XF 10-24mm F4 R OIS at the end of 2013.

Last week Microsoft released the Windows Phone 8 version of its Photosynth 360 degree panorama app, making it compatible with latest generation smartphones such as the Nokia Lumia 920, HTC 8X or Samsung Ativ Odyssey. We installed the app on Samsung's first Windows Phone 8 device, the Ativ Odyssey, and had a closer look at what it can do. Click through for our hands-on article.

We've had a chance to use the Nikon Coolpix A - the company's DX-format, fixed-lens compact. The Coolpix A features a 16MP APS-C sensor with no optical low-pass filter and a 28mm equivalent F2.8 prime lens. Nikon has done a lot of work to make the Coolpix A consistent with its DSLRs, from its interface to its compatibility with accessories. Click through for more.

Nikon has posted a gallery of ten images and a video of the new Coolpix A DX-format compact camera. The camera features a 16MP APS-C sensor with no optical low-pass filter and a 28mm equivalent F2.8 prime lens. The images that Nikon has posted are taken by documentary photographer Doug Menuez in JPEG Fine (8-bit) mode. Click through for some images and a link to the full gallery. 

We've just posted a hands-on preview of Nikon's latest small form-factor compact, the Coolpix P330. Externally almost identical to its predecessor the P310, the P330 features a larger 1/1.7" BSI-CMOS sensor and raw capture mode - two additions that should make it much more popular with enthusiasts, as well as putting it in direct competition with Canon's popular PowerShot S110. We've spent a little time with the P330, and for more details, images and specifications, click through to read our hands-on preview. 

Nikon's AF-S Nikkor 80-400mm F4.5-5.6 G ED VR will be eagerly welcomed by many enthusiast and professional Nikon photographers who've been waiting for a replacement for its 12 year-old predecessor. The original 80-400mm was Nikon's first lens to offer vibration reduction but the intervening years have left it looking rather long in the tooth. The latest version boasts a new optical design, built-in SWM focus motor and much improved vibration reduction. In this short article, Barnaby Britton gives his opinion. 

Nikon has unveiled its first DX-format compact, the Coolpix A, alongside the enthusiast-focused Coolpix P330. The Coolpix A fits a 16MP APS-C CMOS sensor with no optical low-pass filter behind a 28mm equivalent, F2.8 prime lens. The Coolpix P330, meanwhile, gains a 1/1.7" sensor and Raw-shooting capability, over its predecessor. The Coolpix A will cost around $1100/£1000/€1100, while the P330 will retail for around $380/£350/€380.

Nikon has launched the AF-S Nikkor 80-400mm f/4.5-5.6G ED VR, a redesigned version of the 12-year-old 80-400mm VR. The G version features an entirely new optical formulation, ring-type AF-S focus motor and revamped VR system capable of a claimed four stops of stabilization.

Nikon Europe has announced the Coolpix L320 CCD-based superzoom, while Nikon USA has announced the Coolpix S3500. The 16MP L320 features a 22.5–585mm equiv. zoom lens, 3.0" LCD, 720p HD recording and runs on two AA batteries. It will be available from the end of this month at a retail price of around £199.99. Nikon USA has announced the Coolpix S3500, revealed last week in Europe.

Last week North Korea started to allow foreigners to use a 3G mobile network from inside its borders. This means that tourists and visiting professionals alike can now tweet and upload instagrams from Pyongyang. However, access to mobile networks is still limited for locals. Two of the most notable Instagrammers in North Korea are Associated Press journalists Jean Lee and David Guttenfelder. Since the change, the journalists have used their accounts to present life inside North Korea. Click through to see their images.

Canon has developed a 35mm full-frame CMOS image sensor designed for low-light video capture. The 16:9 sensor features a 1920x1080 pixel array, meaning each pixel measures a huge 19 microns along each edge - 7.5 times larger than the ones in the EOS-1D X. The large pixels and low readout-noise circuitry allow the sensor to capture light around 10 times less bright than current CCDs used for astronomy. The sensor will first be shown in public at a security show in Japan.

Phase One has unveiled the Wi-Fi enabled IQ260, IQ260 Achromatic and IQ280 medium format digital camera backs. The 60MP IQ260 and IQ260 Achromatic feature maximum shutter speeds of 1/10,000th of a second. The IQ260 Achromatic is a black-and-white version, with no color and IR filter. The cameras' wireless capabilities allow users to remotely capture and view images from iOS devices. All three backs feature 3.2" multi-touch rear screens with 1.15m dot resolution, and built-in accelerometers. They will be available from June 2013 at suggested retail prices starting from €29,990 /$39,990.

Graphics tablet maker Wacom has announced on Facebook it will launch a mobile multi-touch tablet this summer. While it has not posted any details about this device, Wacom's social media post says it will include a pressure-sensitive pen, multi-touch options, an HD display and 'other valuable features that you haven’t seen in other tablets'.

Just posted: Fujifilm X-E1 review. With a sensor and imaging pipeline that is identical to the X-Pro1's the X-E1 promises much of the X-Pro1's fun in a more compact and affordable package. We've spent the past few weeks using the X-E1 intensely with the full range of lenses now available for the X-system, and have prepared a full in-depth review. Following the release of raw support from Capture 1 and much improved raw support from Adobe, the X-E1 (and X-Pro 1) just got a whole lot more appealing, too. Click through for a link to our full review. 

Freelance photojournalist Sara Naomi Lewkowicz recently recounted the events that led to her presence during an incident of domestic violence. The harrowing images that she captured illustrate, among other things, the extent to which this photographer was able to 'blend' into the lives of her subjects, capturing a scene in which you'd imagine an outsider would be prohibited from documenting. Yet Lewkowicz's account has drawn online detractors who question whether intervention, not documentation was the appropriate response. Read on for more details.

PocketWizard has added a budget model to its camera/flash radio trigger line: the PlusX 'auto-sensing' transceiver, that automatically switches between transmit and receive as needed. The PlusX offers the ability to trigger cameras and flashes over 10 radio channels. It features a side-profile design, backlit display, an internal antenna, and a dual-function LED indicating connection status plus battery life. PocketWizard PlusX will be available towards the end of March at a suggested retail price of $99. There is currently no information about the European price and availability.

The Instagram Socialmatic concept camera, first announced in May 2012, could become a reality by next year following some recent agreements between Socialmatic LLC and C & A Marketing. The two companies would work together to bring the device to market under the Polaroid brand name. Intended as the Instagram app icon come to life, the stand-alone digital Polaroid Socialmatic Camera would both share images on the popular photo-sharing social network and print them using a built-in system. Read more about the proposed specs on connect.dpeview.com.

Think Tank has announced three new accessories for their camera bag line-up. The Low Rider Strap with a split-pad design attaches a second bag to one's main rolling luggage and is available for $29.75. The Pro DSLR Battery Holder, priced at $17.50 accommodates two full-sized DSLR battery packs. A limited edition Pixel Pocket Rocket holds CF and QXD memory cards. Priced at $18.75, this memory card holder was manufactured in just one production run and will be unavailable once the stocks runs out. European prices and availability information to be confirmed.

Nikon has announced the launch of its Nikon School in UK. The company's education and training program that has been popular in the US for a decade will start in London from April 2013. It will offer photography courses, from beginner to advanced, to product specific courses and workshops. The company is currently offering £20 discount for online bookings. Click through for more information and links to the School's website.

Sensor maker Aptina has announced it has signed a patent cross-license agreement with Sony, that provides each company with access to the other’s patent portfolio. This agreement gives two prominent sensor makers access to some of each other's technologies for future development of cameras and other imaging products.

Day four at the Mobile World Congress in Barcelona and the team at connect.dpreview.com is still at the show, visiting manufacturer stands to find the newest in smartphone and tablet camera technology. We've added brief hands-on articles of the weatherproof Sony Xperia Z tablet and multi-screen YotaPhone. Click through for links to the latest content at connect.dpreview.com.

Accessory maker Satechi has announced the BT Smart Trigger, an iOS-controlled Bluetooth 4.0 shutter release for Canon DSLRs. It features multiple shooting modes including timelapse and long exposures, via the free Smart Trigger app. The trigger has a claimed battery life of up to 10 years and range of 50 feet. It is currently available for an introductory price of $44.99. An Android-compatible version will be available from March 2013.

Samsung is expected to unveil the Galaxy S4, its next flagship Android smartphone on March 14 at a press event in New York. The company took to its Twitter account this morning to tell followers to be ready '4' the next Galaxy. Read more at connect.dpreview.com

Video-sharing service Vimeo has partnered with video-editing company Vivoom, to add a filter effects tool called 'Looks'. More than 500 effects ranging from vintage to futuristic and can be applied during video upload. Each effect can be adjusted from 0-100% intensity. Looks will be free to Vimeo’s registered users for the next 90 days. Read more at connect.dpreview.com.

Toshiba Semiconductors has been demonstrating a sensor module for mobile phones that allows Lytro-style refocusable images. The company promises 2MP images from an 8MP sensor and is already working on a version with higher-resolution output. However, there's reason to believe such cameras would be even more prone to the drawbacks we identified in Lytro's camera. Click through to find out more.

While most smartphone manufacturers have opted for a 13MP camera module, HTC is going the opposite way in terms of sensor resolution, equipping the HTC One with a 4MP camera. However, the photodiodes that collect the light on the HTC's sensor module are similar in size to those found in enthusiast compact cameras such as the Canon Powershot G15, and as such, and HTC promises this will result in much better low-light performance than conventional smartphone cameras. We take a closer look at what HTC is calling 'ultrapixel' technology at connect.dpreview.com

US technology company Rambus has unveiled 'Binary Pixel' sensor technology, promising greatly expanded dynamic range for the small sensors used in devices such as smartphones. Current image sensors are unable to record light above a specific saturation point, which results in clipped highlights. Binary Pixel technology gets around this by recording when a pixel has received a certain amount of light, then resetting it and in effect restarting the exposure. The result is significantly expanded dynamic range from a single exposure. 

Adobe has announced a smartphone version of its Photoshop Touch app for both Android and iOS. The app was originally launched for 10-inch tablets and more recently a version for smaller tablets such as the iPad Mini and Google Nexus 7. It includes features familiar to Photoshop users such as layers, advanced selections tools, adjustments and filters, but in a much smaller format. Photoshop Touch for smartphones is available on the Apple App Store and Google Play for U.S. $4.99. Read more at connect.dpreview.com

Popular photo-sharing service Instagram has reached a milestone of 100 million monthly active users. The mobile app, among the most popular ways of sharing images worldwide, was launched in October 2010. The platform has seen exponential growth since then. Read more about its two-and-a-half-year journey, including the Facebook acquisition in 2012, controversial changes to its Terms of Service and more at connect.dpreview.com

The latest release candidates of Adobe Camera Raw (7.4) and Lightroom (4.4) include improved demosaicing logic for Fujifilm's X-Trans sensor cameras, including the flagship X-Pro1. We found previous ACR versions struggled with fine detail and color accuracy, so were anxious to re-process our X-Pro1 files in ACR 7.4 RC. Is this the update X-Pro1 owners have been waiting for? Have a look at our results.

It is day two at the Mobile World Congress in Barcelona and the team at connect.dpreview.com are there, covering the newest in smartphone and tablet camera technology. We've visited the stands of LG, Samsung, ZTE, Asus and Huawei to cover their latest products and as well as news and commentary we've published several brief hands-on articles with the latest new gear. Click through for links to the latest content at connect.dpreview.com.

Adobe has announced 'release candidate' versions of Lightroom 4.4 and Adobe Camera Raw 7.4. As usual, the latest near-complete versions add support for recent cameras. What makes this release especially significant, however, is improved support for Fujifilm's X-Trans sensor models, including the X-Pro1 and X-E1. The Lightroom update also corrects a series of bugs present in the current version of the software. As usual, release candidates are considered well tested but not final.

Just Posted: Sony NEX-3N hands-on preview with real world samples. We've had a chance to use and shoot with a NEX-3N and, now that Sony US has announced the camera, we can publish our look at the latest model. The 3N is the fourth entry-level NEX camera and the smallest so far. Despite this, it includes most of the features of its predecessors. We look at what has been added and what it lacks, compared to last year's NEX-F3.

A controversy over photojournalistic ethics and integrity has sprung up over the accusation that Magnum photographer Paolo Pellegrin misrepresented both the subject and context of an award-winning image. An image purporting to show a gun-wielding former Marine corps sniper in a rough neighborhood is actually of a former photojournalism student in a safe neighborhood. Was this simply poor record-keeping or a deliberate fabrication? Read on for more details.

Pentax Ricoh has moved its K-01 K-mount mirrorless camera to the 'discontinued' section of its website after just 12 months on the market. The unconventional-looking K-01 used a full-depth Pentax K lens mount but relied on contrast-detection AF, rather than the phase-detection systems for which all autofocus K-mount lenses have been primarily designed. Designed by Marc Newson, the K-01 was one of the most unusual-looking cameras we've ever tested. Click through for more details.