Flowers and More on Aperture on Cropped Sensor Cameras (Four Photographs)
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My last two posts have focused on aperture, why aperture priority is a great place to start and why there are compromises with some lenses and cameras. This time I want to deal with a few other elements. As I mentioned in my last post, if you do not have a full frame camera (I do not) then you should multiply the aperture by the sensor format factor (e.g. for Nikon and Fuji it would be 1.5). This means an F2.8 lens is actually an F4 plus lens. This allows us a more realistic expectation of the lenses’ performance and why in advertising you hear the smaller the sensor the more depth of field. The myth is that there will be no bokeh in out of focus backgrounds. Bokeh, the lovely circles of light in the background, are as much a function of the F stop as the number and shape of the aperture blades in your lens. So assuming your lens does not have a lot of nicely rounded aperture blades, to get an out of focus background with bokeh all you need to do is have the distance between you and your subject be considerably less than the distance between your subject and the background. Using a large aperture like F3.5, the farther away the background is from the subject the more it will be out of focus and the more likelihood of bokeh. At any aperture, one-third of the depth of field is in front of your subject and two-thirds is behind your subject. Turning to the photos, the first was taken with a 200-500mm lens at F8, the second with a 300mm lens at F5.6 , and last two with 90mm lens at F5 and F2. Hope this helps.