This Week Canon Watch Readers Photo Selection

Arsi Ikonen‎ – Brown bear with 7D + 70-200 mm F2.8 L. I like that lens!

How it works:

1) Submit your picture with a short description on Canon Watch’s Facebook page
2) Like and comment the pictures from other readers on the Photo Stream
3) A selection of the most liked pictures will be posted every Sunday here on Canon Watch

Show us what you can do with a Canon camera!

NOTE: if you post your photo late in the week it will be evaluated the week after. Nothing gets lost :-)

Aki Zenji‎ – Silent Night, EOS 70D+EF-S10-22mm — at Yongsan Army Base.


Dominick Chiuchiolo‎ – One of my first shots with the 7DMKII and 70-200 f2.8 IS II. Long Island, NY Swans. Tres Amigos


Matthew J. Taylor‎ – Working with Canons 85mm f/1.2 prime, this was shot in my garage, the first time i put the 85mm on my 60D. Makes me wish i could afford a full frame canon… — with Sharlem Nina.


Diego Eidelman‎ – Rose wine on a summer day, 5D Mk III + 100mm macro f/2.8L IS, f/5, 1/100″, ISO 4000


Terrell Woods‎ – The coming of the storm in SoCal


Canon EF 100-400mm f/4.5-5.6L IS II Review (Photozone)

EF 100-400mm posted their review of the brand new Canon EF 100-400mm f/4.5-5.6L IS II lens. And it is a very positive one.

From the conclusion:

The king is dead, long live the king! Seems as if Canon wanted to show the new mirrorless kids who is still the boss around. The Canon EF 100-400mm f/4.5-5.6 USM L IS was already good but the Canon EF 100-400mm f/4.5-5.6 USM L IS II is even better. Canon managed to improve the image sharpness substantially (mostly in the lower range). The image center is now dead sharp and the borders and corners are easily very good at mainstream settings. The very low amount of CAs (at and beyond 200mm) is highly impressive. The vignetting remains rather typical for a lens in this class, so you will be able to spot some light falloff at fully open aperture (300/400mm). Image distortions are well controlled. The quality of the bokeh is good although the best prime lenses continue to have an edge here. Bokeh fringing is not an issue due to the relatively small max. aperture.

Photozone’s review comes with test charts and sample pictures. The EF 100-400mm f/4.5-5.6 USML IS II is shipping since last week, and can be ordered at B&H Photo and Adorama. Price is $2,199.

  • EF Mount L-Series Lens/Full-Frame Format
  • One Fluorite and One Super UD Element
  • Air Sphere and Fluorine Lens Coatings
  • Ring-Type USM AF Motor, Internal Focus
  • Optical Image Stabilizer with 3 Modes
  • Rotating Zoom Ring & Torque Adjustment
  • Weather-Sealed Design
  • Detachable, Rotatable Tripod Collar
  • Rounded 9-Blade Diaphragm

See if the EF 100-400mm f/4.5-5.6 USML IS II is available in your country: Amazon, B&H, Adorama, Canon USA, Digitalrev, eBay

EF 100-400mm f/4.5-5.6L IS II

Sigma 150-600mm f/5-6.3 DG OS HSM Sports (Canon mount) Sample Pics

Sigma 150-600mm

Photography Blog posted a set of 60 full size sample photos shot with the new Sigma 150-600mm f/5-6.3 DG OS HSM Sports lens. An EOS 5D Mark III was used with the Sigma.

The Sigma is not a budget lens, this professional optic for sports and action sells for $1,999. Pre-orders of the Sigma 150-600mm are possible at B&H Photo and Adorama.

  • Canon EF Lens/Full Frame
  • Aperture Range: f/5-6.3 to 22
  • Two FLD and Three SLD Elements
  • Hyper Sonic Motor AF System
  • Optical Stabilizer with Accelerometer
  • Zoom Lock & Manual Override Switches
  • Minimum Focus Distance: 102.4″
  • Splash and Dust Proof Mount
  • Lens Hood & Rotatable Tripod Collar
  • Compatible with Sigma USB Dock

Sigma 150-600mm

See if the Sigma 150-600mm f/5-6.3 DG OS HSM Sports lens is available in your country: Amazon, B&H, Adorama, Canon USA, Digitalrev, eBay

How To Detect an Exoplanet Using Just a Canon Rebel XS

To detect planets orbiting around other stars you do not need an enormous telescope or equipment that will break your bank. You can do it using a Canon Rebel XS, a cheap telephoto lens, and a barn door tracker, i.e. something that helps with the tracking of the stars.

On IEEE Spectrum, David Schneider describes how he did it. The grounding idea is to apply the transit detection technique. In other words: you can use an ordinary DSLR to detect stars that become less bright during the time their planets are passing between the star and the point of observation (that’s you and your camera).

What’s the barn door tracker? To do what David Schneider did, you need a device (where you’ll mount the camera on) that can compensate for the rotation of the earth. Without this device, you would picture star trails instead of a sharp snapshot.

Using a Canon Rebel XS (around $200 on Amazon or eBay, a manual-focus Nikon 300mm telephoto lens (around $100 on eBay), a Nikon to Canon adapter (around $15 on Amazon), and the mentioned self-made tracking device, Schneider framed HD 189733, a star with known exoplanets that orbit the star every 2.2 days. In order to detect the transit of the planet, Schneider shot 50 seconds exposures for 3 hours. The transit of the planet lasted 108 minutes.

Says Schneider:

The hardest part of the whole project proved to be waiting for an opportunity to observe the transit of HD 189733’s exoplanet, which takes place once every 2.2 days. That sounds frequent, but transits that occur during daytime or are too close to the horizon are impossible to observe. […]  And of course, I needed clear skies.

Finally, after weeks of waiting, an opportunity came in mid-October. I recorded images for almost 3 hours, beginning about a half-hour before the start of the 108-minute transit. That, I figured, would capture the transition from normal brightness to ever-so-slightly dimmed and back to normal again.

Obviously you can’t see the transit just by looking at the pictures. You have to do some computing stuff. Using the free astronomical image processing software Iris and then MS Excel, Schneider made

[…] differential-photometry calculations—that is, comparing HD 189733 with one of […] four reference stars to compensate for changes in atmospheric conditions. The scatter in the final results was about the same size as the signal I was attempting to measure, but the general dip in brightness was easy enough to discern nevertheless. The average magnitude of the target star diminished and recovered just as the exoplanet’s transit began and ended.

The video on top is where David Schneider explains the process, and shows how he did it. definitely impressive and cool stuff! You can read more about it here at IEEE Spectrum, where Schneider details all aspects of the process.

[via PetaPixel]

 Canon Rebel XS