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  1. #151
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,557

    Cool Bokeh ... a small definition to better looking images

    "Bokeh" is kind of a vague reference in this image. It is revealed by out-of-focus (OOF) or "fuzzy" background, usually, and its quality is usually determined by how direct OOF light sources or reflections are passed through the lens, with it in a wider aperture (usually seen in f/4 or wider), the aperture elements (blades) of the lens tend to interact with it in different ways. Call these "aesthetic qualities."

    If there are no blades and it is a "reflex" or mirror lens, the "bokeh" of these OOF direct lights tend to look like hoops or donuts.

    Name:  Mirror-lens-bokeh-example.jpg
Views: 514
Size:  100.3 KB

    Other lenses will have octagonal-looking spots.

    Name:  Octagonal-bokeh-example.jpg
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Size:  87.0 KB

    Some will have dark shadows in the center of each these OOF lights (considered not very good "bokeh" qualities) and, like above, other lenses will have complete, full circles of color or white, with no change in brilliance (usually considered excellent "bokeh" qualities).

    Is it clear, yet?

    I may be mistaken, but I think what was being referred to, above, was strictly the OOF-background, which is usually a requirement for most portraiture type shots. It tends to make the "subject" pop in the image and makes the "viewer's eye" basically ignore the background. This is correctly referred to as "Depth of Field" (DOF) and is controlled primarily with aperture, focal length and distance to subject (all three do affect it, but it is primarily controlled by the width of the lens aperture). Wider apertures result in "shallower" DOF ... which means the focal plane the subject is in (when the center of focus (COF) is on the subject), is narrower as you ramp open the aperture. Again, this plane also is different for different focal lengths , so when you zoom or change lens lengths (say from a 35mm to an 85mm lens length), the DOF will change accordingly.

    This effect can be effectively calculated (<- click on this link) and really should be understood for each of your "wider" aperture lenses, to use them properly.

    Hope this helps ... there is a little bit to it all.

    A simple yet effective test, is to sit in front of a decorated Christmas tree, then:
    1. open up the aperture to full (f/4 or less, if you have it)
    2. place the center of focus (COF) on the wall, behind the tree
    3. half press and lock the focus.
    4. holding the focus, turn the lens toward the tree and take the image.
    5. tighten the aperture by one stop and repeat the steps.


    Then review the images and you should see the Depth of Field DOF change ... and the bokeh with it. This should make for some cool backgrounds with other things.

    Sorry, I guess this is not what POTD was set up for. Oops!
    Last edited by DonSchap; 12-20-2008 at 09:31 AM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

  2. #152
    Join Date
    Dec 2007
    Posts
    2,562
    I can try to run it through Focus magic if you like. I think I am posting in RGB
    Frank

    I ran it through Focus Magic what do you think??

    Last edited by sparkie1263; 12-20-2008 at 07:13 PM.
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  3. #153
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    I think it looks a bit sharper.
    You need to post in sRGB otherwise the Internet Browser will render the colours differently.
    Last edited by Peekayoh; 12-21-2008 at 05:58 AM. Reason: typo

  4. #154
    Join Date
    Nov 2008
    Posts
    176
    Looks good i see what you are saying what is focus magic and where do you do it at. i finally discovered the whole curves thing you guys have been talking about man is that a crazy thing to get a handle on. i use a MACBOO PRO can i get some suggestions on must have programs that will help me do this.
    Sony A350
    Sony 18-250mm Lens
    Sony 50mm f1.4
    F42AM flash

  5. #155
    Join Date
    Dec 2007
    Posts
    2,562
    Focus Magic i s a program to help correct OOF images and motion blur. It don't work on all images. Here is the link http://www.focusmagic.com/

    Frank
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  6. #156
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    Quote Originally Posted by millz View Post
    Looks good i see what you are saying what is focus magic and where do you do it at. i finally discovered the whole curves thing you guys have been talking about man is that a crazy thing to get a handle on. i use a MACBOO PRO can i get some suggestions on must have programs that will help me do this.
    Adobe Photoshop is top dog and Adobe Elements is a cut down version that will do most things you need. I'm not familiar with other progs but I'm sure there must be something cheaper out there that will fit the bill.

  7. #157
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    We've got three rivers close by, the Severn, the Usk and the Wye.
    This was taken in the late evening sun and I underexposed to boost the colour.

    RIVER USK a half mile North of Usk

    Camera: Sony DSLR-A700
    Lens: Konica Minolta 28-135mm f4/4.5
    Exposure: 1/100th sec
    Aperture: f/8 -1EV
    Focal Length: 60 mm
    ISO Speed: 200
    Date: 03 December 2008
    Attached Images Attached Images  

  8. #158
    Join Date
    Oct 2008
    Location
    Raleigh, NC, USA
    Posts
    788
    I love pictures of the countryside from the UK. There is a different feel, and a lot of it comes from the very different type of grass. Cool trick for the colors. Are you saying you underexposed the picture and then bumped up the exposure to boost the colors?
    Jason Hamilton
    Selective Frame

    EOS 5D - Canon EF 24-85mm f/3.5-4.5 USM, EF 35 f/2, EF 50mm f/1.8 Mk II, EF 70-210 f/3.5-4.5 USM, EF 85mm f/1.8 USM, EF 100mm f/2.8 Macro, Helios 44-2 58mm f/2 (with EOS adapter), 430EX, Canon S90
    Nikon FE - Nikkor 35mm f/2 AI'd, Nikkor 50mm f/1.8 AI, Nikkor 105mm f/2.5 AI, F to EF adapter, 2xVivitar 285, other lighting stuff
    Mamiya C220 - 80mm f/2.8

    Gear List flickr

  9. #159
    Join Date
    Oct 2008
    Location
    Raleigh, NC, USA
    Posts
    788
    Submitted more for fun than art.

    There is a fairly famous hot dog shop in downtown Raleigh called the Roast Grill, popular with government officials and NC State students.

    It's the type of place where you can get a hot dog, and Coke in a glass bottle, but don't even think about asking for ketchup.



    Camera: Sony DSLR-A300
    Lens: DT 18-70mm
    Exposure: 1/25th sec
    Aperture: f36
    Focal Length: 35 mm
    ISO Speed: 800 - I forgot to drop it back down after walking outside
    Date: 01 November 2008
    Last edited by laydros; 12-21-2008 at 02:00 PM. Reason: I always forget EXIF data
    Jason Hamilton
    Selective Frame

    EOS 5D - Canon EF 24-85mm f/3.5-4.5 USM, EF 35 f/2, EF 50mm f/1.8 Mk II, EF 70-210 f/3.5-4.5 USM, EF 85mm f/1.8 USM, EF 100mm f/2.8 Macro, Helios 44-2 58mm f/2 (with EOS adapter), 430EX, Canon S90
    Nikon FE - Nikkor 35mm f/2 AI'd, Nikkor 50mm f/1.8 AI, Nikkor 105mm f/2.5 AI, F to EF adapter, 2xVivitar 285, other lighting stuff
    Mamiya C220 - 80mm f/2.8

    Gear List flickr

  10. #160
    Join Date
    Jun 2008
    Posts
    2,204
    I don't know that I can live without ketchup! Interesting sign
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

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