#Portrait Bokeh Aperture 3.5 Professional Lenses Can
#Portrait Bokeh Aperture 3.5 Manual Focus Control

Portrait Bokeh Aperture 3.5 Professional Lenses Can

If you have an dSLR and you really like the whole bokeh thing, spend 100 or so and buy a 50mm f/1.8 lens Having fun with bokehVisit any photography website or forum and youll find plenty of folks. Take your shot and have.The exact f-stop number will depend on your camera and lens, but for most common DSLR lenses, you’ll expect this number to be around f/3.5, or if you’re zooming in, this number may only go as low as f/6. BOKEH Aperture Priority 85mm F/1.2 1/1250 ISO 400 Aperture Priority 85mm F/3.5 1/160 ISO 400 Much like the 50mm before it, the Canon RF 85mm f/1.2L USM produces absolutely stunning bokeh that instantly makes your portraits (and all your images shot at large apertures, for that matter) look absolutely appealing.MTF50 and Bokeh for 25mm Micro Four Thirds LensesSet your camera to Aperture Priority mode and the lowest f-stop (normally f/3.5 or f/2.8, although professional lenses can go lower).

3.7 as described using a SFRplus Chart. MTF50 values were determined to assess sharpness, and two indoor scenes were photographed to evaluate out of focus background blurring characteristics of point light sources and reflected light (bokeh).Lenses tested ( size, weight and cost data):MTF50 performance was determined using Imatest Master v. Performance of several 25mm lenses was compared with that of the 20mm Panasonic f/1.7 pancake lens that I have been using for most normal lens applications. The 25mm focal length is often used for photography with normal perspective and portrait application and has the equivalent field of view or perspective to a 50mm lens on a 35mm camera or full-frame DSLR.

The lenses differed in the size and pattern of the point light sources in the out of focus background, the size and eveness of illumination of specular light in the background and overall blurring effect. Out of focus light blur qualities influencing whether out of focus blur or blur disc are perceived as pleasant or unpleasant are influenced by size of the blur disc, eveness of blur disc illumination and blur shape.To assess bokeh produced by the tested 25mm micro four thirds lenses were taken with out of focus backgrounds containing text as well as other objects with detail as well as point light sources and objects with specular (reflected) light. A number of lens design characteristics influence the quality of out of focus blur (online references: Merklinger , van Walree , Atkins and Carl Zeiss) including aperture (both f/stop setting and maximal lens opening size), aperture iris shape, and degree of spherical aberration correction. It gave excellent MTF50 performance at these other focal lengths.Imatest was also used to evaluate vignetting (light drop off), distortion and chromatic aberration (Results are summarized here).The 25mm 50% MTF data are plotted on a logarithmic aperture scale and broken down into center, midzonal and corner MTF plots on this page.Bokeh (or boke) is a photographic term originating from Japanese photographers that refers to quality of blur or fuzziness of out of focus areas due to lens design. All lenses tested showed low CA values as measured from the SFRplus Chart with Imatest Master.Because the Panasonic G X 12-35mm lens gave lower MTF50 results at 25mm than other lenses tested, the lens was also tested at 12mm, 20mm and 35mm.

The background includes many mini lights that show the iris pattern of one lens (Voigtlander), and the rest of the background is illuminated by a fluorescent light fixture (mixed lighting conditions).Click above photo for results of first bokeh test.Note the overall blurring of the image (e.g., text and carved duck figures) at each lens- aperture combination. The focus point was illuminated by the on camera flash of a GX1 that provided the source for the specular light off the sequins on the reflector (click on photo for more detail). Greater depth of focus of the wider angle lens probably also resulted in lower levels of background blurring.The background is 6 feet behind the focus point which is 40 inches away from the camera. This effect probably had much to do with the larger overall aperture of the 12-35 (58mm filter size) versus the smaller diameter 20mm lens (46mm filter size). The f/2.8 Panasonic G X 12-35mmAt f/4 produced more pleasing bokeh than did the f/1.7 Panasonic 20mm lens at f/4. However, maximum f/stop aperture did not always predict quality of blurring.

Portrait Bokeh Aperture 3.5 Manual Focus Control

Similar text, mono lights and sequin reflectors are in the background in addition to a USAF1951 test pattern. The focus point is the mannequin right eye taken with an Olympus E-PL3 camera and external view finder which allowed better manual focus control with the Voigtlander lens than did the GX1. The camera is 32 inches (81 centimeters) from the mannequin head. The mannequin is 3 feet (91 centimeters ) in front of the background. It has a filter diameter of 46mm and maximum aperture of f/1.4Mannequin Head Target with Bokeh Test BackgroundThe purpose of this setup was to test aperture needed with a 25mm micro four thirds lens to get adequate depth of focus for eyes and nose to be in focus while also blurring the background. The same area was cropped out of jpg images produced by the GX1 camera.Image code - f1.4_46_1.4_PanLeica25 = Panasonic Leica 25mm lens at f/1.4.

There is moderate vignetting at f/1.4 and f/2.This lens gave the smoothest blurring of out of focus background. Iris diaphragm patterns were not visible in out of focus mini light images (effect of circular iris diaphragm opening?) The lens autofocuses quickly and accurately. Out of focus specular reflections were close to being evenly distributed with very minimal peripheral banding. It could be used wide open for portrait applications and provided excellent out of focus blurring. Click on photo to right to see results.Same test conditions with full-frame DSLR and 50mm f/1.4 lensThis lens gave the overall best performance for a 25mm lens when both sharpness at wide aperture and bokeh were considered. It has a 52mm filter diameterAs a reference point to appreciate the relatively greater depth of field and lesser background blurring capacity of micro four thirds lenses, the same set up was photographed with a full frame DSLR camera (Canon EOS-5D) and EF 50mm f/1.4 lens.

It also had the most severe vignetting wide open. The one unusual feature of background blurring was that out of focus images of the mini lights produced strong iris diaphragm patterns in all images at f/1.4 and to a lesser extend at f/2.The Nokton produced very soft images at f/0.95 as shown in the MTF50 plots and in the portrait style image. Blurring of the USAF1951 pattern and the text was most extensive with the Nokton. Out of focus specular light images had the most evenly distributed light pattern with no ridge formation.

It may be the largest of the variable aperture 3X zooms (see photo) for micro four thirds cameras, but it remains my favorite based on performance.Summary of Performance of the Panasonic 20mm f/1.7 Pancake lensThis lens is the smallest and lightest of the lenses tested. The 14-45 is an older 3X zoom that came out with the G1 camera. Background blurring was negligible under the test conditions with this relatively slow (f/5) lens. At 25mm, it was sharp from f/5 through f/8. Similar effects were created when the lens was shot at 35mm (images not shown).This lens gave excellent MTF50 performance over the focal lengths tested.

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Portrait Bokeh Aperture 3.5

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