Just added to the site: Canon EF 500mm f/4.0 L IS II USM Lens Review
The 500 L IS II review is going to sound similar to the Canon EF 600mm f/4.0 L IS II USM Lens Review
These lenses are more similar than different, with size, weight, price and focal length being the significant differentiators.
Use coupon code S6549875
to get the Canon EOS 5D Mark III DSLR with EF 24-105mm f/4L IS USM Lens
, EF 50mm f/1.4 USL Lens, SanDisk 32GB ExtremePRO SDHC Memory Card, Canon Deluxe Photo Backpack 200EG and Red Giant Adorama Production Bundle for PC/Mac for $4,399.00 (the camera and 24-105 lens kit alone sells for $4,299.00). Deal expires 07/10/2012.
Time to get creative - Adorama
is having a Lensbaby Composer sale:
Lensbaby Composer - $159.95 (Reg $199.95): Canon
Lensbaby Composer Pro with Sweet 35 Optic - $319.95 (Reg $399.95): Canon
Lensbaby Pro Effects Kit - $599.95 (Reg $749.95): Canon
University at Albany press release: Scientists Develop Method for Authenticating Digital Images by Analyzing 'Noise'
ALBANY, N.Y. (June 25, 2012) – University at Albany Computer Scientist Siwei Lyu and colleagues, working in partnership with the New York State Center for Information Forensics and Assurance (CIFA), have identified a new method using “noise” to authenticate digital photography. The research is supported by a grant from the National Science Foundation (NSF).
The team presented its findings for exposing digital image splicing by measuring "noise" levels discerning discrepancies in photos at the IEEE International Conference on Computational Photography.
"Whenever a photo is manipulated digitally, the underlying characteristics of the image pixels are disturbed in a way that they become unnatural,” Lyu explains. “Though human eyes may not be able to detect such subtle changes, they can be readily picked up by computer algorithms. The techniques developed aim to make sure that more significant manipulations can be detected."
Noise, the digital equivalent of film grain, exists in all digital photography, and is generally invisible to the human eye. Numerous factors during and after a photo is taken introduce noise, such as temperature and thermal conditions, sensor saturation, quantization, compression, and transmission. While an unaltered image is expected to have uniform noise strength across all pixels, inconsistencies in noise variances in altered photos become telltale evidence of tampering.
Using statistical and computational analysis, Lyu's team developed techniques that effectively measure noise strength across a photo to determine which parts of the photo originated from different sources.
According to Lyu, the method is advantageous in that it does not explicitly rely on the knowledge of image format, camera model, or tampering procedure, and has a high level of detection accuracy.
The past decade has witnessed significant advances in digital image processing and computational photography, resulting in sophisticated image-editing software systems such as Adobe Photoshop and GNU Image Manipulation Program. Yet the ease of digital image manipulation has also posed new challenges, with digital images becoming more vulnerable than their non-digital counterparts to malicious tampering.
"Collectively," Lyu said, "the digital image forensic community aims to provide a series of tools that can significantly limit the extent of undetectable manipulations, or increase the real cost, in terms of time and technical sophistication, of making a believable forgery."
Learn more about Lyu's work in digital forensics
, or explore UAlbany's College of Computing and Information
. For more UAlbany news, visit the News Center
I received confirmation from Canon that this extremely hot deal expires today: Use coupon code June612
for free shipping and coupon code 20SLR612
to save 20% on refurbished Canon DSLR Cameras
, Lenses and Flashes
at the Canon Store
As I said before, the lens inventory has been ravaged, but additional models show up occasionally - keep checking.
There are many good DSLRs avilable - at amazing prices. Some examples:
Refurbished EOS 7D - $1,087.20
Refurbished EOS 60D - $639.99
Refurbished EOS Rebel T3i with EF-S 18-55mm IS II Lens - $511.99
You can expect Canon refurbished gear to be like new. I often buy refurbished gear.
Celebrate the July 4th holiday with a free 8x10 or $40 off any size canvas at Canvas People
- just pay shipping.
Feedback from Canvas People's prints has been very positive.
Nikon has updated distortion control data for the following Nikon DSLRs:
D90, D3100, D3200, D5000, D5100, D7000, D4, D800, D800E
Download the update here
Apple has made Aperture 3.3.1 available for download
. What's New in Aperture 3.3.1
- Fixes an issue that in rare cases could cause Aperture to hang or quit unexpectedly when upgrading libraries.