robar
Premium
join:2002-12-04
Mesquite, TX
| reply to robar
Re: DIY: led ring light
finished this today. unfortunately i sold my 100mm macro today(ebay) and packed it before realizing that i don't have another macro that will work w/it. these were shot w/the kit lens. the pliers is a full image resize. i may try it w/a reversed 50mm but i'll have to adjust the light spred to do it. the sigma 105 is on the horizon..
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camstone
join:2003-12-11
Alexandria, VA | Neat... 
I have a couple of questions though...
How well does it work wrt white balance?
Much of a color shift?
Also, any issue with uniformity of the light? |
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robar
Premium
join:2002-12-04
Mesquite, TX
| said by camstone  :Neat... I have a couple of questions though... How well does it work wrt white balance? Much of a color shift? Also, any issue with uniformity of the light? look at the last two pix above.
and this one
»/showpic/dimag···er=0&1=1
all shot w/auto wb. i haven't tried a manual wb yet. but as you can see, the colors seem to me to be very accurate with the subject.
these were 20 degree LEDs , that's why i left about 1/2'' of space below the led. you can damage the led if you bend the wire too close to the lens. i'm still taking a chance bending the wire as it is. i've got the LEDs tilted at about 20 degrees and have a pretty good convergence from about 3''-14'' which would be well within the range of the sigma 105 i plan to get. |
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Andrew J
Premium
join:2001-11-09
Lancaster, PA
clubs:
 ·Comcast
 ·Vonage
 ·Verizon Online DSL
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Canon PowerShot A510
5.8mm 1/60th F2.6
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Canon PowerShot A510
5.8mm 1/60th F2.6
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Canon PowerShot A510
5.8mm 1/13th F2.6
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Best Team. |
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robar
Premium
join:2002-12-04
Mesquite, TX
| said by Andrew J :Thanks for the info and pics. I just made one not as good but it works. From 2- $10 Home Depot LED flashlights and a CD/DVD package. Don't put this in your carry on. andrew,
it that your resistors on the side? from what i've been told you really need to use them in case a LED shorts. it could cause the battery to catch fire.
all said and done i think i've about $14 in this. the most expensive piece is the step up ring i used to attach to the camera. i've got enough LEDs to build 2 more of these if anyone's interested in helping me get the sigma. |
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Andrew J
Premium
join:2001-11-09
Lancaster, PA
clubs: | Yeah, the little circuit boards are on the side with the resistors. Just put little extension cords to each LED.
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Best Team. |
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ttiiggy
Premium
join:2001-03-27
edit:
June 22nd, @09:15PM
| reply to robar
said by robar :from what i've been told you really need to use them in case a LED shorts. it could cause the battery to catch fire. Ahh. THAT explains it... I was wondering why you had a resistor to each and every LED. Seemed to me that you could have just attached the LEDs to a couple of wire circles and use less batteries or one resistor for the whole setup. But without a resistor for each, if a LED was to short out, it would be a dead short across the battery and it might make something get pretty hot.
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If it ain't broke, you haven't tried enough stuff yet. |
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robar
Premium
join:2002-12-04
Mesquite, TX | bells and whistles for you tiggy.. i went over and over w/this w/a designer before doing this project. |
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Red_Menace
join:2001-11-03
Littleton, CO
| reply to ttiiggy
said by ttiiggy :Ahh. THAT explains it... Actually, the resistor is to limit the current flow through the device so that you don't burn it out - I suppose an LED could short out, but it would be unlikely. |
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