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                   Tuesday, September 24, 2013 - 2:58AM CDT

10mm wide angle field of view equivalents

By DAN ROBINSON
Editor/Photographer
25 Years of Storm Observing
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I love the extra-wide field of view of the Canon 10-22mm lens, which has been indispensable for weather expeditioning. I was curious, though, what some of the images I took at 10mm would look like if I had used my other lenses, namely the 18-55mm and the 50mm. To accomplish this, I made a blank layered PSD (Photoshop) file with outlines drawn to represent the frame equivalents. I posted this file for download here so you can make the same comparisons to your images, if you happen to have the same lenses I do. To use this, resize your main image to 2000 pixels and paste it on the bottom layer. Then, you can move the middle layers to move the 18mm and 50mm frame boxes around.

PSD FILE: 10mm, 18mm and 50mm field of view comparison

Here are some examples from using this PSD file. This is the Bennington tornado at roughly one-half mile away at 10mm, with an 18mm and 50mm frame outline. The only drawback with 10mm is it makes very close tornadoes look a little farther away than they actually were, removing a little of the 'feel' of being that close. The 22mm end of the lens or the 18mm frame would have probably captured the 'closeness' of this moment a little better, but when you're in a situation like this there isn't much time to think about it. The 50mm lens would have only been able to see a small part of the tornado. Nonetheless, I'm happy with the image because you can see more of the collar cloud/wall cloud structure.

Here is a crop showing what a final 18mm image would look like:

- and with the 50mm lens:

A couple more examples: The St. Louis skyline and Mississippi River:

Oklahoma supercell:

Gateway Arch aerial:

Busch Stadium fireworks:

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The following comments were posted before this site switched to a new comment system on August 27, 2016:

Excellent post! How did we ever manage without them?
- Posted by p from d

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