Standard Crop Factor How the Camera Model Affects Your Lenses Toms Guide

“Canon’s DSLRs come in a huge range of prices, from the $400 EOS Rebel T5 to the $6,000 EOS-1D X Mark II. One of the factors that determines price is the size of the sensor. Canon’s top cameras use a sensor about the size of a 35mm film frame in old cameras. However, most of Canon’s DSLRs use a smaller sensor, with the jargony name Canon APS-C. (It’s 38 percent the size of a full-frame sensor, but still huge compared to what your cellphone has.)
Credit: Junko Kimura/GettyThe camera’s sensor size determines how images look. For any given lens, cameras with larger sensors capture wider-angle images; those with smaller sensors capture more zoom. Here’s how that works and what it means for the lenses you buy.
How sensor size determines zoom
In Canon cameras with a full-frame sensor, the lens projects the full width of what it captures onto the sensor. But it can project only the center portion of what it captures onto a smaller APS-C sensor. It’s as if you took the full-frame image and cropped off the edges, thereby zooming in to the narrower portion in the center of the image.
The zoom you get when using a smaller sensor is called the crop factor, calculated as the diagonal measure of the full-frame sensor divided by the diagonal of the APS-C sensor. For Canon cameras, this comes out to 1.60. So, switching a lens from a full-frame to an APS-C Canon camera is like zooming in 60 percent more.

The red frame indicates the crop factor from Full frame to ASP-C sensor. Credit: Canon”

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musthave adornments for each Canon DSLR proprietor TechRadar

“Whether youu2019ve just got yourself a Canon DSLR like the EOS 1300D / EOS Rebel T6 or 750D / Rebel T6i, or have owned one for a while, the camera and the bundled 18-55mm kit lens it just the start.
The beauty of investing in a DSLR is that while they can be used straight out of the box, thereu2019s a world of accessories out there to help you really harness their power and take even better shots.
These include additional lenses, filters, tripods and a host of other accessories. But with so much choice, where to begin? Weu2019ll point you towards some of the key items of kit youu2019re likely to want to invest in, and offer suggestions for each.
1. Standard prime: Sigma 30mm f/1.4 DC HSM | A
While your 18-55mm kit lens is fine for general photography, its relatively ‘slow’, in that the maximum aperture available is quite limited. Thatu2019s where a prime lens comes in. Often offering a much faster maximum aperture, they let in more light, allowing you to shoot handheld in much poorer lighting conditions. Not only that, but the faster maximum aperture means you can achieve pro-looking shallow depth of field effects to isolate your subject.
They come in a range of focal lengths, but our pick would be the Sigma 30mm f/1.4 DC HSM | A; giving roughly the same field of view as the human eye on a Canon APS-C DSLR, itu2019s whatu2019s termed a u2018standardu2019 prime. A must for any photographer.
Read more: 9 things you should know about prime lenses
2. Telephoto zoom: Tamron SP 70-300mm f/4-5.6 Di VC USD
The next lens youu2019ll probably want to add to your collection is a telephoto zoom. Not only are these perfect for action and wildlife photography, theyu2019re also great for picking out details in landscapes and shooting tightly cropped portraits or candids.
While pros tend to favour the 70-200mm f/2.8 telephoto zoom, theyu2019re heavy and expensive, which is why weu2019ve picked the Tamron SP 70-300mm f/4-5.6 Di VC USD.
Offering more reach than a 70-200mm, while also being more compact and affordable, this is a great choice for those looking to pull in even distant subjects u2013 and it comes with Vibration Control (Tamronu2019s anti-shake system) built in.
Read more: The best telephoto zoom lenses for Canon DSLRs
3. Wide-angle zoom: Sigma 10-20mm f/3.5 EX DC HSM
Youu2019ve probably found that your Canon 18-55mm u2018kitu2019 lens is pretty wide, but not quite wide enough for some subjects.
An ultra wide-angle zoom lens can offer a field of view almost be twice as wide, making it perfect for cramped interiors, big city landmarks, sweeping landscapes and surreal close-ups.
Our pick would be Sigmau2019s 10-20mm f/3.5 EX DC HSM, but itu2019s worth remembering that this lens is only compatible with APS-C cameras, so if youu2019re pla
ing to upgrade to a full-frame camera later youu2019ll have to trade this lens in as well.
Read more: The best wide-angle zoom lenses for Canon DSLRs”

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