DxOMark has tested two recently-announced announced long telezooms, the Sony 70-400mm F4-5.6 G SSM II and the Nikon AF-S Nikkor 80-400mm f/4.5-5.6G ED VR, as well as the older AF Nikkor 80-400mm f/4.5-5.6D ED VR. As part of our ongoing collaboration we've added the test data to our lens comparison widget, and to add a little more context we've also included a couple of super-tele primes from Canon. Click through to see how these lenses compare, with links to view the results in our lens widget, and for the full data on DxOMark.

Connect, our sister site has just published a roundup of this week's photography-related app news. From major updates to Google+'s mobile app to new apps for iOS users including AnalogCamera, Oggl and Viewmatic, there's plenty going on. Click through to connect.dpreview.com for more details. 

Canon has posted a firmware update for its EOS-1D Mark IV and EOS-1Ds Mark III full-frame DSLRs to allow them to work correctly with the new EF 200-400mm F4 L IS 1.4x lens. Firmware versions 1.1.3 (1D Mark IV) and 1.2.2 (1Ds Mark III) allow the cameras' central AF points to achieve focus with the lens when it is used with an extender, where the combined aperture is F8. Both updates are available for immediate download. 

Canon has announced that it has now produced 90 million EF lenses since the launch of the EOS system in 1987. The proliferation of digital SLRs has seen a rapid increase in lens production in recent years, and the company's 90 millionth lens - an EF 24-70mm f/2.8L II USM - was manufactured on May 23 2013, just over 9 months after its 80 millionth. The company's lens lineup currently consists of no fewer than 84 models, ranging from the inexpensive EF 50mm f/1.8 II to high-end exotica such as the recently-announced EF 200-400mm f/4L IS USM Extender 1.4x - the world's first SLR lens with a built-in switchable teleconverter. 

DPReview is hiring! We have two open positions available: we're looking for an Editor to join our team of writers and reviewers, and a Software Manager. If you're interested in joining our growing team and you have experience either writing photography-related content for the web, or managing developer teams to launch successful projects, you should click through for more details.

Camera feature modifier Magic Lantern has piqued interest in the five-year-old Canon EOS 50D by enabling video recording on this previously stills-only camera. The development work is still in early stages, but a user has posted raw video footage at 1592 x 720 resolution at 24p. Click through to see why videographers are excited about this newly added feature. (via EOSHD.com)

Samsung has published the source code for its NX300 and NX2000 mirrorless cameras - the first attempt we've seen at offering public access to a mainstream camera's operating system. The approach, which the company has previously used with its smartphones, stands in stark contrast to other camera manufacturers, which have not engaged with the community of programmers looking to enhance the capabilities of their cameras.

David Akerman, a ballooning hobbyist based in England has been working with the Raspberry Pi Foundation to use their products for high-altitude photography. Using a Raspberry Pi computer hooked up to the company's new camera module, Akerman created a lightweight 'eye in the sky' that he recently sent up to more than 120,000 feet above the United Kingdom. Click through for more details - and images - on connect.dpreview.com.

In the second, concluding article of his 2-part tutorial explaining Photoshop's Gradient tool, Jean Miele explains how to use linear, reflected and radial gradients in layer masks to improve your digital photographs. In this article Jean takes us through four clear, easy steps, and also includes more tips for making the most out of gradients in both Photoshop and Lightroom. Click through for links to the article. 

The Phottix BG-5DIII battery grip is a budget-friendly alternative to Canon's BG-E11 battery grip for the EOS 5D Mark III, allowing you to double the battery life and enhance handling when shooting vertical format images. Can it do the same job for less cash, or should you save up for the Canon-branded accessory? Find out in our review. 

We've been fans of Aaron Johnson's comic strip 'What the Duck' for years. 'WTD' is one of the best satirical comic strips in the world, and it's published here every week, as well as being included in our weekly newsletter. Barbed, topical and always amusing, we hope you enjoy WTD as much as we do. Click through for this week's strip.

Just a reminder - you can get a weekly update of all that's new in the digital photography world by subscribing to the Digital Photography Review Newsletter! As well as updates on what we've published, we'll also be sharing sneak peeks at what we've got in the pipeline, as well as a weekly cartoon strip, and occasionally also readers' polls, (bad) jokes, suggestions for photo projects and more. Click through for more details. 

In a brief note on its Japanese website, Sigma has announced that the Sony and Pentax mount versions of its highly-regarded 35mm F1.4 DG HSM 'Art' lens will go on sale on 31st May. It's also announced that the Nikon-mount version of its 120-300mm F2.8 DG OS HSM 'Sports' telephoto zoom will be available at the same time. We gave the 35mm F1.4 our Gold Award when we reviewed it back in December, for its combination of exceptionally good optics and solid build at a price rather lower than the camera manufacturers' equivalents.

Video sharing service Vine has generated a lot of buzz in recent months. Vine allows you to share videos of up to six seconds in length as either a single continuous take or as a 'collage' of short duration clips. Art Director Jethro Ames saw Vine as a challenge and decided to push his limits to see what he could do with the app. The result is a series of imaginative timelapse videos that are perfectly executed down to the last detail. Click through to see his work, and our interview on connect.dpreview.com.

Canon has patented a color-sensitive multi-layered sensor design, showing the company is still pursuing the technology. Like Sigma's Foveon chips, the multi-layered design allows each of the sensor's pixels to capture color information without the need for colored filters. The patent, discovered by the Japanese Engineering Accomplishment blog, suggests a system to promote resonance within the sensor, in an attempt to make the lower layers of the sensor more sensitive. (from Egami blog)

Leica has placed a teaser on its Facebook page for a new 'Mini M' camera to be launched on June 11th, that apparently will slot into its range between the M rangefinder and the X2 fixed-lens compact. It's given no other details, but we think it could make sense for the company to produce a full-time live view version of the M Typ 240, using the same sensor but with the expensive rangefinder assembly removed. This would result in a 24MP full frame mirrorless camera that would be able to use almost any manual focus SLR or rangefinder lens ever made, without a field-of-view crop. 

If you've never had the chance to stand in the front row and shoot a live concert, Montreal-based photographer Pierre Bourgault has the next best thing. He attached a GoPro camera to the top of his Canon DSLR and recorded a seven-minute video of his shooting experience at a Dead to Me concert. He then overlaid the actual photos taken at the show, which you can view after the break.

Fujifilm has updated the firmware for its X-Pro1 and X-E1 mirrorless cameras, to improve the autofocus speed with the recently-launched XF 55-200mm F3.5-4.8 R LM OIS telephoto zoom lens. Versions 1.05 for the X-E1 and 2.04 for the X-Pro1 are available to download from the Fujifilm website. Click through for the links.

We've just added three studio comparison pages to our previously-published preview of the Pentax MX-1. The MX-1 is Pentax's flagship compact camera, and something of a departure for the manufacturer, offering a fast F1.8-2.5 zoom lens, full manual control and a high-class, metal body, to compete with more established peers like Panasonic's LX7. Click through to go to the new pages in our preview, and see for yourself how the MX-1 compares to its rivals.  

We just published the DxOMark Mobile Report for Samsung's new flagship smartphone, the Galaxy S4 on connect.dpreview.com. DxO's imaging experts have analyzed 14 aspects of mobile imaging including detailed image quality assessment, flash performance, autofocus reliability and more to calculate a final score. This report will be integrated into our full review once it is finished but for now click through to find out how the Samsung Galaxy S4's camera performed in the DxOMark lab tests.

Animated flipbooks have been around for nearly 145 years. With just a little thumb action, these books allowed you to view a few seconds worth of animation. Now, a new concept camera known as the Gifty allows you to record video and print a flipbook instantly. The only problem: you can't buy one yet. 

Much of the fallout surrounding Flickr's massive updates this Monday continues to center around the legacy 'Pro' accounts and a contentious statement from Yahoo CEO Marissa Mayer: 'There’s no such thing as Flickr Pro today because [...] there’s really no such thing as professional photographers anymore.' She apologized today for her 'misstatement', and it appears that existing Flickr Pro account holders will still be able to take advantage of unlimited storage. Read all about it at connect.dpreview.com.

If you've ever wondered who to thank (or blame) for those 8-bit animated graphics that remain prelevant even on today's high-bandwidth Internet, Steve Wilhite is your man. He was honored for that achievement at this year's Webby Awards and took the opportunity to once again remind us how 'GIF' should be pronounced. (via New York Times)

We've just posted our review of the The Olympus PEN Mini E-PM2. The E-PM2 is an entry-level Micro Four Thirds system camera, with a 16MP CMOS sensor and full 1080 HD video. It's one of the smallest mirrorless cameras on the market and boasts 8 frames per second continuous shooting. This second generation 'Mini' is effectively the image quality 'guts' of the OM-D in a compact, lightweight, novice-friendly form. Click through to find out what we think of it.

When homes are damaged, often the most important items cannot be replaced. For victims of fire, floods and other natural disasters, family photos are among the worst things to lose. Operation Photo Rescue brings together victims with professional photo editors to turn damaged images back into clear memories. Learn more on connect.dpreview.com.

Just posted: Our review of the Tamron SP 24-70mm F/2.8 Di VC USD. In our latest lens review produced in collaboration with DxOMark, we look at Tamron's fast standard zoom for full frame cameras - the first in its class to include optical stabilisation. With its Ultrasonic Drive focus motor and drip-proof construction, it looks like a very tempting option for full frame shooters, especially as it costs rather less than its counterparts from Canon, Nikon or Sony. But is this all too good to be true? Click through to read our review and find out.

Our friends and collaborators over at DxOMark have recently been looking into how lenses score on specific cameras, and the latest model they've examined is the Nikon D600. In a three-part article published at the end of last week, they investigate how 70 lenses from Carl Zeiss, Nikon, Samyang, Sigma, Tamron and Tokina measure up on the D600's 24MP sensor.  The article also compares how given lenses score on the D600 compared to the 36MP D800 and 24MP D3X. Click through for links to the three parts of the article.    

Flickr fans may find the lure of a free terabyte attractive, but they might be put off by the accompanying advertisements that support Flickr's new free account model. A major update to the photo sharing service has completely revamped the look of accounts and restructured the way users may pay for Flickr in the future. We take a look at the changes on connect.dpreview.com.

A cover image in the latest issue of the New York Times' monthly style magazine, T, has led to an interesting discussion about the newspaper's policy on photo retouching. While editors forbid any image manipulation beyond, 'minor color-toning and brightness' in news stories, retouches and removal of blemishes are allowed in the style magazine's fashion photography. Does a newspaper risk credibility by allowing retouching on editorially-branded content? Click to read more and share your thoughts.

Lindsay Adler and Erik Valind, both working professionals and educators, have written a beginner’s guide to photographic lighting with an unusual conceit at its core. By structuring a book around a list of common challenges - what they call the 'top ten worst situations' - they've created a digestible, useful 'lighting 101' guide. In this short review, Adam Koplan takes a look at their book 'Shooting in Sh**ty Light: The Top Ten Worst Photography Lighting Situations and How to Conquer Them'.

At last week's I/O developer conference Google announced a number of upgrades to the photo section of its Google+ social network, including features such as 'Auto-Highlight', 'Auto-Enhance' and 'Auto'-Awesome'. To make the same experience available on its mobile platform the search giant has released an upgraded Google+ app for Android. Click through to Connect to find out more.

Adobe Photoshop has become ubiquitous since its introduction more than 20 years ago, but it isn't the only game in town. In this article, we've selected 10 photo editing programs that aren't all as well-known as Photoshop, but which are well worth investigating if you're looking for other options. Click through for a link to the full article. 

We've been fans of Aaron Johnson's comic strip 'What the Duck' for years. 'WTD' is one of the best satirical comic strips in the world, and we're pleased to announce that we'll be publishing it weekly on dpreview.com, starting today. Click through for the first in what we hope will be a long series!

At its I/O developers conference a couple of days ago Google introduced various updates to its Google+ social networking platform, many of which will be of interest to photographers. As well as changes to layout, images can be 'auto-enhanced', made into panoramas and animations, and the system can also select the best facial expressions in group shots. Click through for more details on connect.dpreview.com.

We've just posted our 20-page review of the Nikon D5200. Nikon's 'advanced beginner' APS-C DSLR offers several features that should also appeal to enthusiasts, such as a 24MP CMOS sensor, a 39-point AF system inherited from the D7000 and an Auto ISO system linked to the focal length of the lens. Add an articulated rear LCD and the ability to output uncompressed video and you've got the makings of a very promising camera. Does the D5200 live up to its potential in real-world use? Click through to read our in-depth review.

Adobe has issued a 'release candidates' of Adobe Camera Raw 8.1 and DNG Converter 8.1 on its Adobe Labs site. The release is the first version of ACR designed to work with Photoshop CC but, as promised, is also compatible with Photoshop CS6. CS6 users will only gain camera compatibility, not any of the functions added in ACR 8 (and Lightroom 5), such as the perspective-correcting 'Upright' tool or the advanced healing brush. The latest version brings support for 7 additional cameras along with 16 lens profiles.

The XiStera smartphone tool is one of the more interesting Kickstarter projects we've seen lately. It is an all-in-one device that promises to do just about everything the mobile photographer on the go might require. XiStera serves as a lens adapter, phone stand, tripod mount, headphone wrap and stylus for your iPhone 5. It also works as a bottle opener and key chain, and can attach an optional LED light to your phone. Click through to Connect for more details.

According to a report in the Wall Street Journal, Olympus is to cease production of its cheapest V-series point-and-shoot compact digital cameras. This follows a financial report this week which showed a group net profit of 8.02 billion Yen in 2012, driven by the company's medical instrument business, but a loss of 23.07 billion yen for its imaging business. In response, the company has slashed its sales targets for compact cameras from 5.1 million units in 2012 to 2.7 million for the current business year. Click through for more details.

A patent filed by Apple in 2011 and discovered this week by appleinsider.com seems to hint at a 'social camera flash' system, allowing multiple iOS devices to be connected and used as secondary strobes for impromptu flash setups. The patent is filed as an 'illumination system' and describes 'initiating a master-slave relationship between the image capture device and at least one secondary device'. Click through for more details.

The BBC's Technology Correspondant, Rory Cellan-Jones, has been getting to grips with the new camera module for Raspberry Pi - the low-cost DIY computer. The camera board was announced earlier this year, and opens up enormous potential for applications including robotics and high risk aerial/underwater use. Cellan-Jones got hold of one of the new camera boards and has written a short article in which he details the 'nightmarish complexity' of making it work. Click through for a link to the full article.

Adobe Product Manager Tom Hogarty stressed that Adobe has, 'no plans to make Lightroom subscription-only at any point in the future.' The statement, made in light of the overwhelming response to Adobe's Creative Cloud announcement last week, was made during a Google+ Hangout today in which both Hogarty and Lightroom PM Sharad Mangalick responded to audience questions. Click through for their further statements on Lightroom features and availability.

Following Nokia's launch of the the Lumia 925 in London yesterday, we had a chance to get our hands on the new device, which features a camera with a 6-element lens, try it out and take some pictures. We also spoke to Juha Alarkuu, the head of Nokia's imaging department in Finland, and Samuli Hanninen, vice president of Software Program Management for Nokia, about the 925's new imaging technology and what it means for mobile photographers. Click through for the full story on connect.dpreview.com.

Sony's RX1 fixed 35mm full frame compact has received the prestigious Camera Grand Prix 2013 title, while Sigma's 35mm F1.4 DG HSM was named lens of the year. The awards, organized by the Japanese Camera Journal Press Club have a history of recognizing what prove to be historically significant cameras. Meanwhile, the Editors Awards were given to the Canon EOS 6D and Sigma's DP Merrill series of compacts.

DxO Labs has released version 8.1.6 of its DxO Optics Pro software. Both the Elite and Standard versions gain support for the Canon EOS 700D / Rebel T5i, Nikon Coolpix A and Coolpix P330, Pentax MX-1, and Sony NEX-3N. The Elite version also gains support for the Leica M. The update also adds 267 lens and cameras combinations to its library, with a list of over 12,000 combinations now available. Click through for the download link.

Panasonic has issued a firmware update for its Lumix G X Vario 12-35mm F2.8 ASPH Power OIS fast standard zoom for Micro Four Thirds cameras (H-HS12035). Version 1.2 improves the stability of the optical image stabilisation during movie recording. It's available to download now from the LUMIX customer support site - click through for the link.

Nikon has introduced the 1 Nikkor 32mm f/1.2 portrait lens for its 1 System of mirrorless cameras. It will provide the angle of view and depth of field control of an 86mm F3.2 lens for a full-frame system, making it the most enthusiast-friendly optic yet released for the 1 System. The lens, whose development was announced in October 2012, is also the first to use a silent wave motor for focus and to incorporate the company's 'nano crystal coat.' Consistent with these loftier ambitions, Nikon will ask around $900 for the 32mm f/1.2 when it becomes available in June.

Canon has introduced the EF 200-400mm f/4L IS USM Extender 1.4x - a top-end telephoto zoom with a built-in switchable teleconverter, whose development was first announced back in February 2011. Simply flicking a lever at the rear of the barrel converts it to a 280-560mm f/5.6 lens. Designed for professional sports and wildlife photographers, it includes an array of top-end features such as Power Focus for movie shooting, and IS 'mode 3' that only applies stabilisation at the point of exposure, aiding panning. It also offers weathersealed construction, 4-stop image stabilisation, and a minimum focus distance of 2m. It will go on sale on 29th May, at an RRP of £11999.99 / €11800.

Canon has created a 'Video Camera X-series look' Picture Style for its EOS cameras, specifically designed for movie work. As its name suggests, it's designed to match the colour look of the company's X-series professional camcorders. It produces low contrast, low saturation footage that's better suited to post-production grading processes than the cameras' existing options. It's downloadable now from Canon's website and can be installed on almost any Canon EOS model, from the movie-optimized EOS-1D C to the mirrorless EOS M.   

BlackBerry is offering up the first major update to its new operating system. The update brings a more restrictive work-only setting, better visualization of device information and an HDR camera mode for users of the Z10 handset. The smartphone maker also debuted a new phone today: the Q5 includes a Qwerty keyboard as well as two BlackBerry capture features, TimeShift and StoryMaker. Read more at connect.dpreview.com.

While the Lumia 925 Nokia announced today may not offer the stunning specs of the 808's PureView technology, the device does hold promise for mobile photography fans. Its six-element lens design promises improved detail in good light and better quality in low light, and the sensitivity includes a new ISO 3200 setting. An aluminum-edge body with polycarbonate back, integrated antenna and wireless charging are also new, along with the Nokia Smart Camera app which offers some interesting shooting modes, including the unique Motion Focus. See sample images on connect.dpreview.com.