) eine Funktion zur Korrektur optischer Fehler von Objektiven eingebaut. Adobe has built into its third version of the tool photographers in Lightroom and Adobe Photoshop CS5 (Camera RAW) is a function for correcting optical aberrations of lenses. Unfortunately, the selection of supported lenses is limited.

As mentioned in my presentation by Adobe Lightroom 3 above, this "one-click correction" is not only simple but also achieves very good results. Unfortunately, there are a few of my beloved lenses not in the list of supported lenses. Especially for my very frequently used Tamron zoom lens profile is not included. For this reason I have my work done with the help of Adobe Lens Profile Creator to create the necessary self-correction profiles. Nearly 400 different settings were necessary to produce the raw material for the three lens profiles. Above all, creating a useful profile for a super zoom lens requires some patience.

Result

LD bei 28 mm. The example shows a 100% cut of the right lower corner of a shot with the Canon EOS 50D and the Tamron AF 28-300mm f/3.5-6.3 XR Di VC LD at 28 mm.

The results speak for themselves. Clearly visible are the distortion and chromatic aberration (color fringing) in the original. After application of the lens profile, these errors are almost completely compensated.

Unfortunately, the portal is planned from Adobe for the exchange of privately created adjustment profiles (yet) and also the function for online submission of finished profiles to Adobe is not currently functional. und Adobe Photoshop auch der Allgemeinheit zugänglich zu machen, habe ich hier das Paket zum Download eingestellt. In order to still the profiles I created for Adobe Lightroom, Adobe Camera Raw and Adobe Photoshop to make even the general public, I have set the package to download. The profiles include the following objectives:

• LD Tamron AF 28-300mm f/3.5-6.3 XR Di VC LD
• Canon EF 28mm 1:2.8
• Canon EF 50mm 1:1.8 II

Download the correction profiles

• Fotomanisch.de Lens Profile Version 1 Packet

Instructions

After downloading the package with the lens profiles , extract its content to the appropriate destination directory for your operating system:

• Windows XP
  • C: \ Documents and Settings \ (username) \ Application Data \ Adobe \ CameraRaw \ lens profiles \ 1.0
  • C: \ Documents and Settings \ All Users \ Application Data \ Adobe \ CameraRaw \ lens profiles \ 1.0
• Windows Vista or Windows 7
  • C: \ Users \ (username) \ AppData \ Roaming \ Adobe \ CameraRaw \ lens profiles \ 1.0
  • C: \ Program Files \ Adobe \ CameraRaw \ lens profiles \ 1.0
• Mac
  • / Users / (username) / Library / Application Support/Adobe/CameraRaw/LensProfiles/1.0
  • / Library / Application Support/Adobe/CameraRaw/LensProfiles/1.0

Reference
Replace "(user name)" with your user name. When Windows XP is "C: \ Documents and Settings" translated into the operating system language. At a German Windows directory is named according to the "C: \ Documents and Settings".

More links

• 30-day trial version of Lighroom 3 (PC / MAC)
• Adobe Lens Profile Creator

Whether it comes to photography from space, vast landscapes and large buildings will always need to return the largest possible angle of photographers to capture your subject. Then come to use the ultra wide angle lens class. One of them, the Sigma 10-20mm F3, 5 EX DC HSM I was able to undergo a thorough testing.

The smaller to reach the image sensor of the camera, the harder it will be a large angle, or a small focal length (Verlängerungs-/Crop-Faktor). There are currently reaching for cameras with EF / EF-S mount lenses have a lot of not very small picture below 20 mm equivalent focal length and a camera with an APS-C sensor. The choice was between the following lenses:

• Canon EF-S 10-22mm 3.5-4.5 USM
• Tokina 12-24mm / 4 Pro DX II
• Tamron 10-24mm F / 3.5 to 4.5 SP Di II LD Aspherical IF
• Sigma 10-20mm f/4-5.6 EX DC HSM
• Sigma 10-20mm 3.5 EX DC HSM

The Canon EF-S 10-22mm is as good if not outstanding lens. It is the most expensive of these, and like most of the Canon EF-S lenses of very "lightweight construction". The Tamron is interesting due to the large zoom range, but is often criticized for its strong focus on the waste boundary. The Tokina is considered "quasi-reference" among the ultra-wide angle lenses. Unfortunately, it starts with a focal length of 12mm (~ 19mm on an APS-C camera), so it's not for me come into question.

That to me on the Canon EOS 50D tested Sigma 10-20/3, 5 is the successor of the famous Sigma 10-20/4-5, 6 and differs from its predecessor mainly due to the better and constant light intensity over the entire zoom range . It is about 520g with 50g heavier than its predecessor, a little longer and consists of 13 elements in 10 groups. The optical system is calculated on the small image circle, so usable without restrictions only to APS-C cameras.

The lens makes a very quality impression. Both the focus and the zoom ring can be operated comfortably. The ultrasonic autofocus drive (HSM) is accurate, fast and very quiet. It allows a permanent manual intervention in the focus. Comes complete with a flower-shaped lens hood and a very well-padded lens case. Both are part of the competition is not necessarily the norm.

Already the first test of focus and sharpness of the lens leaves you wanting more. The resolution and sharpness in the center is excellent even at full aperture. She is typical wide-angle to edge up, but even at the extreme edge is still very neat. Also keeps the distortion is very limited and is for the usual range (not just when you shoot brick walls ) Properly. In strong contrast to the 10mm position covered at 100% views at the outer edge small to medium chromatic aberrations (CA) on. . But these are within acceptable limits and are smaller than my Canon EF-S 18-55mm 1:3.5-5.6 IS . Vignetting is barely discernible in practice.

Since the weekend the weather presented by the technically more pleasant side, a practice test urged in nature to just be. Even here has convinced me of the lens. The extremely large angle of about 100 ° and the good resistance to lens flares under backlight makes it perfect for this purpose.

Sample images:

Conclusion:

The Sigma 10-20mm F3, 5 EX DC HSM is a lens with good optical valent to a Canon APS-C camera properties. Makes the good price / performance ratio makes it real for me on a recommendation.

Addendum:

And one last comment. Wide angle lenses are happy with polarizing filters to remove, used for landscape photography by interfering with veil and catch the sky clear, beautiful contrasts. The Sigma 10-20mm F3, 5 EX DC HSM is a relatively large 82mm filter thread owns. Since a Circular Polarizer (CPL), as he needed for digital cameras AF is very fast really expensive. After some searching I found a good, multi-coated polarizer for very little money, even for the "opportunity offender" is affordable:

• Circular Polarizer 82mm Quenox (MC) for 20 €
• Marumi 82mm Circular Polarizer about 80 €

Tags: equipment , EOS , hardware , lens , Sigma , engineering , test , zoom

Canon Inc., Japan, presents a world first for use in interchangeable lenses for SLR cameras: Image Stabilizer compensates for the hybrid (Hybrid IS), the camera shake during pivoting movements and shifts of the camera. USM zahlreiche weitere, bildstabilisierende Objektive entwickelt. Already in 1995, Canon was able to score with the idea of the world's first interchangeable lens for SLR cameras with an optical image stabilizer to minimize camera shake and after the EF 75-300mm 1:4-5.6 IS USM developed numerous other image-stabilizing lenses. The launch of the first objective with the new hybrid technology is planned for later this year.

Canon Hybrid Image Stabilization

According to Canon, the new Canon compensated hybrid IS technology effectively blurring that can arise from unintentional pivoting motions (rotation) and displacements (linear) of the camera. By camera movement (movement parallel to the main motif) occur mainly due to camera shake in Macro photography and close-ups such as tight portraits, which they accept. Even in standard situations cause sudden changes of camera angle often significant blurring.

Two sensors are used in the new technology is used: an angular velocity and an acceleration sensor. The angular velocity sensor detects and recognizes Mitziehbewegungen pan. He was already part of all previous methods for optical image stabilization. The acceleration sensor allows the detection of camera shake caused by moving the camera. It also uses the hybrid image stabilizer, a new algorithm that takes into account the readings of both sensors and lenses in the lens moves in such a way that both types of image blur are reduced considerably. This optimizes the previous image stabilization and is perfect, especially in macro photography, in the conventional image stabilization techniques have proven particularly difficult.

Already in the 80s started to Canon, the research for methods to compensate for camera shake. USM das weltweit erste Wechselobjektiv für Spiegelreflexkameras mit einem optischen Bildstabilisator zur Minimierung von Verwacklungsunschärfen. In 1995, then presented with the Canon EF 75-300mm 1:4-5.6 IS USM, the world's first interchangeable lens for SLR cameras with an optical Image Stabilizer to minimize camera shake. Since then the company has developed many other interchangeable lenses with image stabilization. USM , das Aufnahmen mit einer bis zu vier Stufen längeren Verschlusszeit ermöglicht. In the current range are 21 of these lenses, including the EF 200mm 1:2 L IS USM, the recordings with up to four stops slower shutter speed allows.

Canon provides for integrating the new Hybrid IS technology into a wide variety of products.

Technology Policy:

Image Stabilizer (IS = Image Stabilizer engl.):
Camera shake is a major cause of blurred images, especially when used without a tripod or when shooting with slow shutter speed in low light conditions. Canon's image stabilization technology, identified by the initials IS (Image Stabilizer for) in the product, uses a shift system for the detection and correction of image blur. By pressing the shutter button halfway, the image stabilization is activated. Tiny gyro-sensors register the lens vibration and send a signal to a microcomputer, which in turn controls a stabilizing element to compensate for the movements along the horizontal and vertical axes of the camera. To prevent unintended panning and tilting is interpreted mistakenly as camera shake, some telephoto and telephoto zoom lenses with IS mode to work second For some selected lenses the IS-2 mode is activated automatically. Takes a movement in a certain direction longer than a predetermined time, in such a case, the image stabilizer is turned off for this movement.

EF lenses with IS technology enable precise, brilliant images with up to four stops slower shutter speed than conventional lenses - ideal for shooting situations where flash photography is not permitted or desired.

Tags: image stabilization , Canon , EF , EF-S , EOS , Lens , technology

To match the current camera announcement of the EOS 50D brings a new lens for Canon cameras with crop factor.

Sensor einsetzbar. The new lens with a focal length of 18-200 mm (29-320 mm based on the small image size) is developed for the EF-S mount, and thus can only be used on cameras with APS-C sensor. For the first time Canon brings to a super telephoto lens and poaching in the previous domain of third-party. The lens is equipped with an optical image stabilizer and should thus allow one to four stops slower shutter speed.

The structure of the lens comprises 16 lenses in 12 groups. UD and aspherical lenses, special lenses to minimize aberrations and chromatic aberrations. The minimum focusing distance is given as 45 centimeters which corresponds to a magnification ratio of about 1:4.

The lens should be available in late September 2008 for about 599 EUR in the trade.

Tags: announcement , Canon , EF-S , hardware , lens , technique , zoom

A day of great new announcements. Canon strengthens its range lens to another lens from the professional segment (L lenses).

The new lens with a fixed focal length of 24 mm (about 38 mm on an APS-C camera) consists of 13 elements in ten groups and to meet such high demands on the imaging quality. Two high-precision aspherical lenses with GMO technology (Glass Moulded Optics) to correct various aberrations such as field curvature and distortion, while the focus mechanism provides with moving elements for a consistently sharp detail drawing in the entire distance range. In addition, two UD lenses reduce the chromatic aberrations that can not be especially high in fast wide angle lenses always be avoided. With a maximum aperture of 1.4, the lens also for more difficult light situations. Additionally it is equipped with an ultrasonic motor for fast focusing.

Technical data:

• Aperture 1:1.4
• Aspherical and UD lens elements to correct chromatic aberrations
• Sub-Wavelength Structure Coating (SWC), which significantly reduces flare and ghosting
• Circular aperture for pleasing defocused effects
• Autofocus with ring-type USM, manual focus at any time
• Lead-free glass (RoHS compliance)
• Incl. Lens hood and lens pouch

The lens should be available in late November 2008. A price has not yet been determined at the current time.

bekannt. Addendum of 19.09.2008: Canon today announces a € 1499 price list for the Canon EF 24mm 1:1.4 L II USM known.

Tags: announcement , Canon , EF , fixed focal length , hardware , lens , technique