Canon lenses – How they are made

9 09 2009

After watching this video on how Canon lenses, and in particular the EF 500mm F4L (~USD10K) are made… I can appreciate why these things are so damn expensive!

Part 1:

Part 2:

Part 3:

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Flickr Upload: Khai Island, Thailand

26 08 2009

Khai Island, Thailand

Stopped at Khai Island for about an hour and a half on a recent trip to Phi Phi islands near Phuket. It’s a beautiful sand island which is good for relaxing and doing some snorkeling too. I wish I was still there…

PP: Masked curves, vignette, sharpening and border.

Looks better on black





Panoramas on Linux

6 10 2008

Larger version: here

This shot is made up of 7 RAW shots from my Canon EOS 400D (aka Rebel XTi) w/ EF-S 17-85mm IS USM lens, here was the process I followed:

The shoot:

1. Mounted the camera on a tripod in portrait orientation, doing this has two benefits… firstly puts the barrel distortion introduced by your lens on the top and bottom making the shots easier to blend and stitch, also it’ll give your pano more height. The down side of course is that you’ll need to take more shots than you would with landscape to get the same field of view.

2. Put the camera in Manual mode to ensure that the exposure is locked. If you use any of the Auto/Semi-auto modes… your camera will re-meter for exposure for each shot – causing the brightness of each shot to differ.

3. Then I selected a specific white balance, in this case ‘daylight’ – but the important thing is not to have it on Auto White Balance, otherwise each shot is likely to be a different temperature.

4. Next I dialed in the aperture to a tiny (F/22), this is to ensure that I get the deepest Depth of Field (DoF) as possible so the foreground and background are sharp and in focus.

5. Then I used the auto focus to do the focus work for me, then once focus was achieved I switched to Manual Focus to ensure that each shot is taken with the same focus.

6. Finally, using my Canon IR remote I shot off the first shot then carefully panned by tripod head until there was approximately 20% overlap from the previous shot then shot off again… then continued until I had the complete field of view I was after.

The post processing:

I did the post processing on my Linux (Ubuntu) box, as a minimum you’ll need the following:

Here is the process I followed:

1. Converted my RAW images to JPEG using dcraw. I used a custom version of the script available here: http://jcornuz.wordpress.com/2008/07/10/here-is-a-little-something-for-your-blog/

2. Renamed the .JPEG output to .JPG, because Autopano-sift-C fails with .JPEG extensions.

3. Batch rotated JPEGs using mogrify from ImageMagick (mogrify -rotate “-90” *.JPG)

4. Opened images in Hugin, and got it to use Autopano-sift-C to automatically find the control points between the set of images.

5. Hugin then uses ‘nano’ to modify the geometry of the images, then ‘enblend’ to stitch them all together.

FYI – I did run into an issue with the latest CVS version of Enblend (v3.2), and had to downgrade to a previous version to make it work.





Canon 5D Mark II – Sample shots and video

25 09 2008

Vincent Laforet’s video – here
Sample stills taken from the above video – here
Lovegrove’s samples – here





Nikon D700 – High ISO madness!

16 09 2008

 

Check out what this new full frame DSLR can do… even at ISO6400!http://gizmodo.com/5040111/nikon-d700-first-photos-yep-little-d3

So many of us try make the best low light performance from our APS-C sized sensors by snapping on some fast lenses in low light, like the inexpensive Canon EF 50mm 1.8… but the problem with wide open apertures is that you get such shallow DoF which almost causes the tip of someones nose to be in focus and their eyes to be blurred! if we could take usable shots at ISO6400… life would be good.