![]() A wider aperture will produce bigger, rounder bokeh. The aperture of the lens also affects bokeh. For example, a lens with seven aperture blades produces heptagons, while a lens with nine (or more) produces more rounded bokeh. Those with fewer aperture blades will render more polygonal circles of confusion. The first is the number of aperture blades in the lens. Several lens design elements affect how bokeh appears. So, that’s also what determines the bokeh quality. How they actually appear is determined by the design and construction of the lens. Point light sources are only theoretically rendered as circles. However, like everything to do with optics, there’s a little more nuance to it than that. This phenomenon is called a “ circle of confusion.” It’s most apparent with point light sources, which is why lights and other specular highlights are so visible when they’re out of focus. When something falls outside the depth of field, instead of being reproduced exactly on the camera sensor, it’s reproduced as a blurry circle. What matters for bokeh isn’t so much that images have out-of-focus areas, but rather, how they’re rendered. The depth of field is affected by the focal length of the lens, the aperture to which the lens is set, the distance the subject is from the camera, and the size of the camera sensor. In an image with a large depth of field, like the photo on the right above, everything is in focus. You’ll notice that even the model’s ears are slightly blurred. In an image with a shallow depth of field, like the portrait on the left above, only a small part (in this case, just a few millimeters) of the focal plane is in focus. It’s what determines what is in or out of focus in an image. I saw this effect over and over again, and chose two representative images only because of the similar composition.The depth of field is the amount of the focal plane that’s acceptably sharp to the viewer. They are out-takes from a series done over several days. these two photos are not part of any test, or even good photography for that matter. Whether or not this is important is open to discussion, but hexagons can compete for attention in some situations. If you look at the out of focus highlights, these shapes are apparent. The Nikkor has only 6 blades and forms a simple hexagonal shape aperture, while the Leica Elmarit with more blades forms a more circular shape. except for the rendition of the highlights. The photos have a similar sharpness and there is not one that jumps ahead of the other for the most part. I posted this a long time ago, but here are two photos made with similar focal length lenses (90mm Elmarit M and 105mm f/2.5 Nikkor) both shot at f/4.0. Im pretty sure the photographer takes the pictures, please dont think you need the 35mm Lux to get good bokeh, its just a tool. Best bokeh tool? In Leica lenses i would vote for the 35mm Lux, the background and subject(its not about the bokeh its about the subject!) are sometimes in such perfect harmony that its allmost 3D. Personally i love the disc(neutral) bokeh type, it renders great depth in a picture if used right. This way the angle in which the light is reflected into the lens is also important. To make things even more complex, most lenses are highly corrected in the centre and less corrected in the edges. I didnt come up with these 3 groups myself off course, they were introduced by Ken Rockwell( ) i think they are a great aid to analysing bokeh characteristics so please read his page about bokeh.Īllthough optical designers aim for the neutral disc shape bokeh, in practical terms there are alot of gradations between these types. The blurred edges occur more in complex optical designs like zoom lenses, they are a result of reflected light in the lens. Sphere shape, gaussian blurred edges, looks cloudy and soft, kinda embracing the subject. Disc shape, perfect gradtions, not distracting at all, flat background OOF area. ![]() Very distracting looks like a pile of rubble.Ģ. Arperture blades arent that important to me, i use a lens wide open if the blades dont provide a perfect round shape.Īpart form diffraction and all kinds of abberations which can invluence the quality of the bokeh there are generally 3 kinds of bokeh.ġ. Steve is right, arperture blades invluence the shape of the OOF circles, the characteristics of the bokeh are deriving from the optical formulae. ![]()
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