There is no change to the image created by the lens – it’s simply that the smaller sensor only captures the central area of the image. You could get an identical result by enlarging and cropping the full-frame image. It is a magnification effect, not a change of focal length. In fact, the APS-C image has been enlarged more than the full-frame image to match the display size. The result from the APS-C sensor is shown above and appears to show an increased telephoto effect. When you come to display an image to fill a computer screen or a print, the result from the full-frame sensor is shown above. The field-of-view is narrower, but nothing else changes. The end result is a smaller area captured, but exactly the same as the central area of the full frame image. An APS-C camera only records a part of the full image (as shown by the white box on the central image). A full-frame camera captures the full image. The original shot was taken with an EF 400mm lens. The focal length might not change, but what does change is the field-of-view. Use the same lens on a full frame camera and an APS-C camera, and you end up with results like those below. It doesn’t.įACT: Focal length is a characteristic of the lens and is not affected by the camera or sensor size. There is a lot of confusion about crop factors, extended reach and telephoto effects when using lenses on APS-C cameras.įirst, let’s dispel the myth that the focal length of a lens changes when switched between a full-frame camera and an APS-C camera. So what does this all mean for your photography? Crop refers to the fact that the image you get with the smaller sensor is a cropped part of the image obtained with the full frame sensor. The main reason for the introduction of the smaller sensor was cost – full frame sensors are expensive. Then, in 2000, along came a camera with an APS-C 'crop' sensor – the EOS D30. EF lenses, like the FD lens system that went before, gave full coverage to 35mm EOS film cameras, then subsequently full-frame – 36 x 24mm sensor – digital cameras. The EF lens mount was introduced in the same year that the EOS was announced – 1987. Terms like ‘crop factor’, 'extra reach’ and ‘equivalent focal length’ just aren’t helpful. This is exactly what happened – as far as we’re concerned – when Canon introduced the EF-S lens mount. Right now, almost all of the best Canon RF lenses are designed for its full frame cameras.Sometimes when an attempt is made to simplify or explain a term or reference point, it can end up complicating the situation. That doesn't mean it's going to do it again with its EOS RF-S cameras. In the old days, Canon EF-S lenses formed a complete and parallel APS-C DSLR lens system alongside its full frame EF lens range. So it could be that Canon's messaging is based on the current lens line-up – but it could also be that the company is using angle of view to its full frame upgrade pitch. Any given focal length gives a 1.6x wider angle of view." "See how a 15mm lens looks on the full-frame EOS R8, compared with an EOS camera with a smaller APS-C sensor. "Transform the way you see the landscape, and get up close for immersive documentary images." So what if its APS-C EOS R cameras are intended to get users into the Canon system, not as systems in themselves?Ĭanon makes four perfectly good APS-C RF-S format mirrorless cameras, but if you want a wide range of lenses, you've got to go full frame. There's no clear indication from Canon, though, that it has any such plans. These include a neat little Canon EF-M 11-22mm f/4-5.6 IS STM which would be a great addition to the RF-S lens line-up, offering a handy 17.5-35mm equivalent zoom range – and there are plenty of other EOS M lenses which would be great to have in RF-S mount. There seems no technical reason why it couldn't. It's possible that Canon will steadily convert its best EF-M lenses over to the RF-S format. Worse, there's no definite indication these are coming. Right now, there are only three dedicated RF-S lenses for these smaller format cameras, and they don't include any ultra-wide optics. Canon is comparing the EOS R8 and other full-frame models with its smaller APS-C EOS R7, R10, R50 and R100 cameras. Now this makes sense with the current lens line-up. The thing that caught my eye is ".wider angles of view." Better bokeh, wider angles of view and image quality that will blow you away – even in low light." was the strapline. "Give your creativity a full-frame upgrade. "MAKE THE LEAP TO FULL FRAME" was the heading. And then something in the EOS R8 blurb on the website caught my eye. It's also backed up by a good range of lenses, many of which are very affordable. Straight off the bat, I think this is one of the best Canon cameras to buy right now. I bought a Canon EOS R8 and I'm very impressed.
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