I tested the Sigma 12mm f/1.4 – it's a perfectly portable prime for APS-C cameras, with a fast aperture for city and night shots

The world's widest autofocus lens for APS-C camera with f/1.4 aperture is a dream for astrophotography and city shots ...
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Photography Tips: What is aperture?

Aperture is perhaps the most important — and also the most confusing — photographic concept to grasp. Mastering the use of aperture opens up a range of artistic possibilities and brings your ...
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How to know what shutter speed, aperture, and ISO your photo needs

Nikon D800 | Tokina AT-X 16-28mm F2.8 Pro FX | ISO 400 | 1/640 sec | F2.8 Photo: Abby Ferguson Understanding shutter speed, aperture and ISO can be overwhelming for beginner photographers. Even once ...
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What is Aperture?

This can have a direct affect on your exposure if the aperture is too large or too small. That is if all else is equal, and you’re not adjusting your ISO and/or Shutter Speed. Let’s keep it simple and ...