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08-05-2012, 09:43 PM   #1
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WOuld you consider Sigma 16mm F2.8 good for landscape

I'm looking for a good landscape wide angle lens and one that has a reasonable price. I came across a Sigma 16mm F2.8...Would you consider it if you wanted a good landscape photography lens? Does 16mm offer a good wide angle? This is my question right now!

08-05-2012, 09:56 PM   #2
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Its a fisheye lens, fisheyes are not usually used for landscapes.
08-12-2012, 04:23 AM   #3
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Good Morning,

Reasonable priced wide angle or ultra wide angle lenses are somewhat of an oxymoron. The wider angle in terms of field of view a lens has the more expensive it is. The optical design and construction of the lenses is just complex.

There is an approach around this, and that is to stitch - take adjoining photographs, with about ~ 20 to 25% overlap, and then use software to stitch them together. There is free software available that does this and its quick and very easy. Microsoft ICE is one.Here is a little bit of background - Wide angle lenses and beyond (ultra wide angle lenses), essentially are engineered to bring in light from around the edges, line them up and then focus it on to the sensors, while trying to maintain some reasonable amount of control over the distortion. Distortion control is the primary problem with the wider lenses. There are also others. For instance, as you bring more "view" in across the edges, you need to put it somewhere on the sensor. In order to maintain a consistent look within the view of the lens, the center of the image "pushed back". This makes perfect sense, however it does give the image somewhat of a distant feeling - with everything looking somewhat smaller.

Your sensor - lets say its 4000 by 3000 pixels, does not grow in size to accommodate the larger field of view provided by the lens, so each pixel essentially represents a larger area within the view.

By using stitching to approach the problem, you are essentially taking multiple images (each say at 40000 by 3000 pixels) and digitally "scotch taping" them together, so through the "stitching" process, you are actually making the sensor "larger", thus each pixel maintains its small area of representation.

Another aspect of this is that most landscapes commercially done, use a focal length of 24 to about 30-35mm. This is because distortion in these focal lengths is pretty much non-existent. By putting the camera in to a portrait orientation, you can take as many images as you want and stitch them all together. You can even do this with telephoto lenses.

Give it a try - just walk outside and take a series of say 5 images overlapped and then stitch them together using the free software.


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