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DPChallenge Forums >> Current Challenge >> Bokeh how-to??
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05/12/2010 08:46:05 PM · #1
just curious if anyone has some (easy) techniques for creating the background light spots for bokeh photography? i know to use shallow DOF to get the blur, but how to get a "sea of small lights" in the background in the first place??

strings of christmas lights?

paper with holes in it and a light behind it?

what have YOU used or can you think of to get that effect?

many thanks!
-mefnj
05/12/2010 08:53:27 PM · #2
Background light spots are not a crucial, nor essential part of good bokeh. It can be a contributing factor to a pleasant bokeh, but it is not the only factor which comprises a good "bokeh". Furthermore, absence of "light spot circles" does not preclude a quality bokeh.
05/12/2010 09:05:15 PM · #3
Originally posted by hahn23:

Background light spots are not a crucial, nor essential part of good bokeh.

Yes, yes...of course. But how do you make them anyway?

:-)
05/12/2010 09:12:41 PM · #4
Highlight off leaves while shooting into the light, sparkles off water, house lights in the evening. will all make those CoC (circles of confusion).

Look for a background with high contrast in a mottled field, and you will get the circles. One bit of warning, if you are going to fake it with a string of lights and it looks out of place, expect some bad reactions. If it works, well, good on you. If it's easy to spot, beware the wrath of the anonymous voter.
05/12/2010 09:27:06 PM · #5
Bokeh, including circles of light, is all to do with depth of field, right?
05/12/2010 09:42:13 PM · #6
I usually don't have a problem getting the circles if I use a long lens.
05/12/2010 09:51:45 PM · #7


what do you think of this bokeh?
05/12/2010 10:06:18 PM · #8
Originally posted by pixelpig:



what do you think of this bokeh?


Donuts of delight! LOL! It works!
05/12/2010 10:08:22 PM · #9
hahaha. you're right, a long lens makes bokeh easier! [eta] good or pleasing bokeh is a cat of another color, though.

Message edited by author 2010-05-12 22:09:10.
05/12/2010 11:29:56 PM · #10
Originally posted by pixelpig:



what do you think of this bokeh?


First thing I thought of when I saw this challenge was, "damn, I wish I had that cat lens..."..
05/16/2010 03:49:54 PM · #11
I found a very nice article by Ken Rockwell on boken. What it is, what some examples of good, neutral and bad boken. How to get it, and how to see it.Link
05/16/2010 04:03:31 PM · #12
Originally posted by pixelpig:



what do you think of this bokeh?


To be honest, I think it is completely horrible! I guess I belong in the smooth and creamy school!
05/16/2010 06:12:47 PM · #13
Originally posted by SaraR:

Originally posted by pixelpig:



what do you think of this bokeh?


To be honest, I think it is completely horrible! I guess I belong in the smooth and creamy school!


haha. to get the little cheerios, you'd need to get the cat-of-another-color lens. I think I saw one on overstock.com. (joke) "D

I like any kind of bokeh, if it works in the comp.
05/16/2010 06:20:55 PM · #14
Originally posted by mefnj:

just curious if anyone has some (easy) techniques for creating the background light spots for bokeh photography? i know to use shallow DOF to get the blur, but how to get a "sea of small lights" in the background in the first place??

strings of christmas lights?

paper with holes in it and a light behind it?

what have YOU used or can you think of to get that effect?

many thanks!
-mefnj


1. First of all bokeh does not mean blurred circle in background. Bokeh simply means out of focus part.

2. There are two rules of thumb you can say:
a: Choose widest aperture. Example F1.4 at 50mm will give more blur than f8 at 50mm
b: longer lense length. (f1.4 at 100mm give more blur than f1.4 at 50mm)

Note in both the above statements it is assumed that camera to subject distance is same. (so framming will change with length of lense).

Example:
(These pictures are only 500 pixel wide, hope that it is not breaking TOS)

F1.2 at 50mm



Notice that there is sharp fouced area , then there is transition to out of focus parts.

Example 2:

F1.8 at 55mm (length changed this time)



Example 3:
Smaller aperture but longer length
F3.5 at 135mm



I hope this explains.

05/16/2010 06:42:11 PM · #15
Bokehlicious

05/16/2010 07:23:07 PM · #16
Originally posted by zxaar:

Originally posted by mefnj:

just curious if anyone has some (easy) techniques for creating the background light spots for bokeh photography? i know to use shallow DOF to get the blur, but how to get a "sea of small lights" in the background in the first place??

strings of christmas lights?

paper with holes in it and a light behind it?

what have YOU used or can you think of to get that effect?

many thanks!
-mefnj


1. First of all bokeh does not mean blurred circle in background. Bokeh simply means out of focus part.

2. There are two rules of thumb you can say:
a: Choose widest aperture. Example F1.4 at 50mm will give more blur than f8 at 50mm
b: longer lense length. (f1.4 at 100mm give more blur than f1.4 at 50mm)

Note in both the above statements it is assumed that camera to subject distance is same. (so framming will change with length of lense).

Example:
(These pictures are only 500 pixel wide, hope that it is not breaking TOS)

F1.2 at 50mm



Notice that there is sharp fouced area , then there is transition to out of focus parts.

Example 2:

F1.8 at 55mm (length changed this time)



Example 3:
Smaller aperture but longer length
F3.5 at 135mm



I hope this explains.


What also helps is to make sure that there's some distances between your subject and your background.
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