Metku.net

MetkuMods
It is currently 25.10.2014 13:12

All times are UTC + 2 hours [ DST ]




Post new topic Reply to topic  [ 43 posts ]  Go to page 1, 2, 3  Next
Author Message
 Post subject: Question / Comments?
PostPosted: 15.11.2009 23:19 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Image
Image In English
Image Suomeksi

Questions, comments?

Kysymyksiä, kommentteja?

_________________
Metku | AlltheMods | LedCalc | Teknolelu | AndroidCoding
Main Computer: Intel i5, MSI H55M-ED55, 12 Gigabytes of DDR3, 3 Terabytes of HDD, GTX295 and Benq 27"


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 16.11.2009 00:30 
Offline
Super Modder
Super Modder

Joined: 15.07.2005 20:33
Posts: 1314
Location: Tampere, Finland.
I'm so building my own one! ;)

(no kidding, I already ordered the rings...)


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 16.11.2009 01:57 
Offline
Mini Modder
Mini Modder

Joined: 17.03.2009 00:00
Posts: 33
Hmm, sounds like a pretty good idea and wouldn't do any harm in my Sony either. I wonder how one of those rings would look in a case fan...


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 16.11.2009 02:06 
Offline
Veteran Modder
Veteran Modder
User avatar

Joined: 15.04.2002 18:52
Posts: 671
Location: Tampere, Finland
I thought of making a ring light too after I saw those pop up in the latest additions at DealExtreme. My main usage will be with my macro lens so they seem to give enough light for that purpose. I'm hoping to get my rings next week as they should have left HK already.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 00:26 
Offline
Junior Modder
Junior Modder

Joined: 17.11.2009 00:20
Posts: 1
Great ring light! Anyone know where I could get rings like this in red, green and blue LEDs? I am using a retroreflective screen for "greenscreen" shooting. The LED rings hotlights they sell for this are 1000s of dollars. Would love to do it with a $6 part! Also have any suggestions about building a dial to adjust the brightness?


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 02:20 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Easiest way to control the brightness would be to use a rheostat / potentiometer. Better solution would be using a LM317 adjustable regulator.

And sorry, at the moment they do not carry other colors. :(


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 06:53 
Offline
Junior Modder
Junior Modder

Joined: 17.11.2009 06:46
Posts: 1
coloured LED's might not be available but coloured perspex™/lexan™/plexiglas™ certainly is available...i'm using a low-tech solution at present, but i am eager to make this project. i am a jewelry fabricator and this looks like it will fill the light around the small metal objects i make.
i currently use a white glass [milk glass] lamp shade. it is truncated and fits around most of the small objects i photograph. i can get my nikon 950 right in there to shoot. in ambient light, it works quite well, scattering light all around.
with the light ring, i'll be able to use a larger digital slur.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 08:47 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Lamp shade is a good choice for this kind of small objects. I've also seen cones made out of paper to scatter the light coming in from the sides. This method has a dual purpose as it controls the reflections too.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 10:44 
Offline
Junior Modder
Junior Modder

Joined: 17.11.2009 10:06
Posts: 1
How much actual power do these ring lights have? I'd like to build a 10W to 20W light, but I'm going to guess that the decorative ring around a headlight is more like 2 watts.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 14:13 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
The smaller ring alone:
P=U*I = 12 volts * 120 milliamps = 1.44 watts.

With the larger one:
12 volts * 330 milliamps = ~4 watts.

If you want more but can't increase the size of the light, perhaps cold cathodes are the way to go. Sure, there are more powerful leds out there but they product quite a lot of heat and one should need several of them to make the light appear more uniform.

The ones that I used offer a steady light but they are not that bright so that you could shoot hand held with very small apertures etc. This just offers a cost effective way to make a usable ring light. I would suggest a tripod but for example the photo from my wife's eye was shot 1/200, f6.3, ISO160 and 50 mm. So it all depends on one's needs.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 14:29 
Offline
Junior Modder
Junior Modder

Joined: 17.11.2009 14:27
Posts: 2
I’d really like to know how much light this produces. By this I mean at a distance of 3 ft what is your shutter speed if an fstop of 5.6 and an iso of 200 is used? Even an estimate from the author would be fine. I just don’t want to build this to find it’s so underpowered that it’s not useful for my uses.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 15:18 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Maurice, read the post above your question.


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 16:38 
Offline
Junior Modder
Junior Modder

Joined: 17.11.2009 14:27
Posts: 2
Thank japala. I missed that comment. Just to be clear there was no cropping done on that photo, correct? My guess would be that you were about 20 cm away from the eye, right? Since light dissipates by the reciprocal of the square of distance you probably need a tripod for all picture taken from 50 cm or more. Do my guestimations seem reasonable?


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 18:26 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
No cropping. I believe you are right about the distance. For example that photo of my daughter's eyes is already 1/25 with ISO125 and f7. For some reason I managed to keep it steady even without a tripod but with that slow shutter speed that was a near miracle. :)


Top
 Profile  
 
 Post subject: Re: Question / Comments?
PostPosted: 17.11.2009 21:04 
Offline
Junior Modder
Junior Modder

Joined: 17.11.2009 20:58
Posts: 2
Japala, I saw your mod via a tech blog, and I am very impressed. I would like to make something similar, or I'd be willing to pay you have you make me one, since I'm not really adept with soldering and such.

Also, you say that you used a motorcycle battery to power these...Is there any other way to get these powered? Possibly via the hotshoe?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 43 posts ]  Go to page 1, 2, 3  Next

All times are UTC + 2 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group