EOS Digital Cameras
The Future of Photography Arrives
The Image Sensor
In the late 19th and early 20th centuries many many film formats were designed and employed in those early cameras. The 35mm format was originally specified as 1.375 inches and was introduced in 1892 by William Dickson and Thomas Edison. They were working with film stock supplied by George Eastman. By 1909 the international standard for movie film became a strip 35mm wide with four sprocket holes per frame. Of course, remember that movies placed their images across the film and not lengthwise.
Eastman filed a patent for this format but in 1902 a court invalidated that patent and thereafter anyone could make use of this film design. It was probably the collapse of that patent that allowed 35mm to become entrenched as the world standard. Although 35mm film was used in still cameras as early as 1908 the first commercial use was in 1913 and it did not become widely used until Oskar Barnack of the Ernst Leitz company brought out his Leica camera in 1924.
Barnack felt that the image area occupied by a horizontal image across the film strip was too small for quality still images and he turned the image to run lengthwise on the strip making the image larger. It was in fact 24mm by 36mm. Each image was bounded by eight sprocket holes as the length of the image was now double that of the transverse image used in motion pictures.
In 1934 Kodak packaged strips of 35mm film in cassettes and he called this format “135 film”. The name stuck. The popularity of 35mm film grew as the cameras became more sophisticated and by the early 1960’s it was the most popular format in the world with amateur photographers.
Skip forward now to the introduction of the electronic image sensor. (It serves our purpose to simply point out that these devices depend on magic and other dark arts to work.) Developers of digital cameras have not felt a need to stay with the 35mm, or “full frame”, image size. As a result, various devices have different sized sensor depending on the target market, the size of the device, or the desired image quality.
However, because the full frame image has been a standard for so long, photographers have learned to judge everything based on that image size. With the new digital sensors they developed the “35mm equivalent focal length” which was used to indicate the field of view of a lens in a manner consistent with the earlier practice. This was necessary because there are so many sensor sizes and a standard way of referring to field of view was needed. The 35mm equivalent focal length of a particular lens-sensor combination is the focal length that one would see with a 35mm film camera to obtain the same angle of view.
The 35mm equivalent is obtained by multiplying the actual focal length of the lens by the crop factor of the sensor. The higher end Canon cameras have three sensor sizes; the full frame sensor with a crop factor of 1, the APS-C sensor with a crop factor of 1.6 and the APS-H sensor with a crop factor of 1.3. So if we are using a camera with an APS-C sensor, such as the 60D, and we attach an EF 50mm prime to it, the field of view we get will be the same as for a 50mm x 1.6 = 80mm lens on a full frame camera.
It would appear that Canon is in the process of phasing out the APC-H size which will leave the full frame sensor for the professional and nearly professional photographer and the APS-C for the amateur photographer.
With the EOS system Canon brought out their EF line of lenses which were able to cover a full frame image with acceptable sharpness and vignette characteristics. These lenses will work with the smaller sensors but they will have a narrower field of view.
With the APS-C sensor it was not necessary to cover such a wide area with good image and so lens could be made smaller and lighter and maintain acceptable image quality over the area of the smaller sensor. Recognizing this, Canon came out with their EF-S lenses. They will only fit on a camera with an APS-C sensor, unlike an EF lens which will fit on both full frame cameras and APS-C cameras.
It goes without saying that the Canon rangefinder cameras, the F series, A series, T series, EE series, were all full format cameras and so their lenses are effectively suitable for EF lens cameras, except for flange distance which makes that difficult to impossible.
However, on a full frame camera with a short flange distance, such as the Sony a7 or a7R, the Canon lenses such as the FD series can function perfectly well, in some degree of manual mode of course. No doubt Canon will be coming out with a similar body on which to mount the old lenses. (Otherwise I will be buying a Sony as my next major camera!)
Various Models of EOS Digital Cameras
|D30||D30||D30||2000 4Q||3.1||APS-C CMOS|
|1D||1D||1D||2001 4Q||4||APS-H CCD|
|D60||D60||D60||2002 1Q||3.3||APS-C CMOS|
|1Ds||1Ds||1Ds||2002 4Q||11.4||Full Frame CMOS|
|10D||10D||10D||2003 1Q||6.3||APS-C CMOS|
|300D||Digital Rebel||Kiss Digital||2003 3Q||6.3||APS-C CMOS|
|1D Mk II||1D Mk II||1D Mk II||2004 2Q||8.2||APS-H CMOS|
|20D||20D||20D||2004 2Q||8.2||APS-C CMOS|
|1Ds Mk III||1Ds Mk III||1Ds Mk III||2004 4Q||16.7||Full Frame CMOS|
|20Da||20Da||20Da||2005 1Q||8.2||APS-C CMOS|
|350D||Digital Rebel XT||Kiss Digital N||2005 1Q||8||APS-C CMOS|
|1D Mk II N||1D Mk II N||1D Mk II N||2005 3Q||8.2||APS-H CMOS|
|5D||5D||5D||2005 4Q||12.8||Full Frame CMOS|
|30D||30D||30D||2006 1Q||8.2||APS-C CMOS|
|400D||Digital Rebel XTi||Kiss Digital X||2006 3Q||10.2||APS-C CMOS|
|1D Mk III||1D Mk III||1D Mk III||2007 2Q||10.1||APS-H CMOS|
|40D||40D||40D||2007 3Q||10.1||APS-C CMOS|
|1Ds Mk III||1Ds Mk III||1Ds Mk III||2007 4Q||21.1||Full Frame CMOS|
|450D||Rebel XSi||Kiss X2||2008 1Q||12.2||APS-C CMOS|
|1000D||Rebel XS||Kiss F||2008 2Q||10.1||APS-C CMOS|
|50D||50D||50D||2008 3Q||15.1||APS-C CMOS|
|5D Mk II||5D Mk II||5D Mk II||2008 4Q||21.1||Full Frame CMOS|
|500D||Rebel T1i||Kiss X3||2009 2Q||15.1||APS-C CMOS|
|1D Mk IV||1D Mk IV||1D Mk IV||2009 4Q||16.1||APS-H CMOS|
|7D||7D||7D||2009 4Q||18||APS-C CMOS|
|550D||Rebel T2i||Kiss X4||2010 1Q||18||APS-C CMOS|
|60D||60D||60D||2010 3Q||18||APS-C CMOS|
|600D||Rebel T3i||Kiss X5||2011 1Q||18||APS-C CMOS|
|1100D||Rebel T3||Kiss X50||2011 1Q||12.1||APS-C CMOS|
|1D X / 1D C||1D X / 1D C||1D X / 1D C||2012 1Q||18.1||Full Frame CMOS|
|5D Mk III||5D Mk III||5D Mk III||2012 1Q||22.3||Full Frame CMOS|
|60Da||60Da||60Da||2012 2Q||18||APS-C CMOS|
|650D||Rebel T4i||Kiss X6i||2012 2Q||18||APS-C CMOS|
|6D||6D||6D||2012 4Q||20.2||Full Frame CMOS|
|100D||Rebel SL1||2013 1Q||18||APS-C CMOS|
|700D||Rebel T5i||Kiss X7i||2013 2Q||18||APS-C CMOS|
|70D||70D||70D||2013 3Q||20.2||APS-C CMOS|
|1200D||Rebel T5||Kiss X70||2014 1Q||18||APS-C CMOS|
|7D Mk II||7D Mk II||7D Mk II||2014 3Q||20.2||APS-C CMOS|
|5DS/5DS R||5DS/5DS R||5DS/5DS R||2015 1Q||50.6||Full Frame CMOS|
|7D Mk II||7D Mk II||7D Mk II||2015 1Q||20.2||APS-C CMOS|
|760D||Rebel T6s||8000D||2015 1Q||24.2||APS-C CMOS|
|750D||Rebel T6i||Kiss X8i||2015 1Q||24.2||APS-C CMOS|
The EOS Digital Cameras in the Collection
Digital EOS cameras are still in use and so their prices are generally higher. The older cameras are bound to come down in price and it is never a good investment to buy something that will go down in value, unless of course, you have a use for it. For this reason I am slower to acquire the digital cameras.
I am not in any way connected to or supported by Canon. I chose their camera line and have stayed with it. I cannot recall why. But a Nikon camera is fine technology and takes a wonderful picture. So too with Sony and the others. But I have been happy with Canon and so I have begun my collection here. One day I may add other brands to my range interest. But that is for another day.