FULL FRAME TO APS C LENS CONVERSION FULL
The first DSLRs used APS-C sized sensors because making viable full frame digital sensors at the time was cost prohibitive and very difficult. This term was coined to help visualize that when you use lenses designed for full frame cameras on a crop sensor camera, the field of view is narrower…like cropping the photo in camera. One term that has been around since DSLRs made their entrance is ‘crop factor,’ which details the difference in focal length required for the same field of view between a smaller sensor camera and a full frame camera. A diagram showing angle of view and the effect a crop sensor has on a lens’ angle of view Crop Factor It simply takes the center area of the image circle projected by the lens, resulting in a narrower angle of view. If the same lens is used, the red rectangle represents the image captured by a crop sensor camera. In this diagram, the green rectangle represents the image captured by a full frame camera. You’ll see arcs showing the diagonal, horizontal and vertical angles of view. This is the angle between the upper left of what’s captured by the lens and sensor and the bottom right (or vice versa).
For instance, a 24mm lens on Full Frame has a diagonal angle of view of 84°. Field of View or Angle of View: The angle of view that the sensor will record for a specific camera and lens combination.The standard sensor size is in a 4:3 aspect ratio and is 17.3mm x 13mm Four-Thirds or 4/3: The sensor size used in Olympus and Panasonic DSLRs and mirrorless cameras (those of the 4/3 or Micro 4/3 system).APS-C: APS-C stands for “Advanced Photo System – Classic” (a reference to APS film), and means a sensor (or camera with that sensor) with a physical size between 22.2mm x 14.8mm and 23.6mm x 15.7mm.Crop Sensor: A crop sensor camera, like on many DSLRs (which use the APS-C size) or the Four Thirds sensor (used in Four Thirds DSLRs and Micro 4/3 mirrorless cameras), is simply a sensor that is smaller in physical size than a full frame sensor.Full Frame: A full frame camera has a sensor that is the same physical size as that of a frame of 35mm film.I have made some minor edits to the text in order to clarify some of the above.įirst off, what does it mean when someone talks about a sensor or lens in terms of 35mm or ‘full frame’ equivalence? Well, quite simply, it is a way to compare angle of view, and more recently, the look you’ll get with respect to depth of field, between a full frame sensor and a ‘crop’ sensor.This is about the use of full frame equivalence for people who have no reason to reference a format they don’t use, and against the far too often seen use of ‘aperture equivalence’ and how it relates to minimum depth of field as an absolute in determining the quality of a lens.This is not an argument about using ‘equivalence’ as a point of reference. I fully believe that using ‘equivalence’ calculations makes perfect sense if you ‘think’ in 35mm terms, and thus it is useful in your mind to do the math to compare focal lengths, or even for depth of field calculations.I am not debating or arguing in any way that full frame cameras don’t have a better image quality baseline that crop cameras…they do as a general rule (same generation, etc). This is not intended to show or imply superiority of any format over another.I’m going to try and give a clear view of what is truly meant when someone is talking about full frame equivalence, as well as dispel several myths about it, and ultimately tell you why, if you shoot with a smaller format, it mostly doesn’t matter.Īuthor’s Notes: This article has been up for a while now, and from several comments I’m seeing with some regularity, I feel the need to make a few points. This can often be a source of great confusion among new shooters, and it can also be a point of disturbingly odd derision for other people, especially with regards to ‘aperture equivalence’. With smaller than 35mm sized sensors, you will often hear talk of a camera’s or lens’ “full frame equivalent” focal length or aperture. 3Why Full Frame Equivalency Doesn't Matter.2Now, let me tell you why none of this matters: Next Page.1What does "Full Frame Equivalent" mean?.
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