Ring macro leds

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fdecomite says:

A ring of led to put around the lens in order to have more light in macro shots. See example shot in the associated set www.flickr.com/photos/fdecomite/sets/72157603 702460275/
Posted 23 months ago. ( permalink )

oskay says:

Nice!
Posted 23 months ago. ( permalink )

cyenobite says:

Good job! Have you considered a diffuser for it? Something simple like a coffee can lid might work?
Posted 23 months ago. ( permalink )

kd1s says:

Nice job on this. I want to build an IR ring for my little Xacti since I know it can see infrared.
Posted 23 months ago. ( permalink )

mkgphotoatgmail says:

very clever.

i appreciate the creativity born from necessity.
Posted 23 months ago. ( permalink )

Quinean says:

very cool!
Posted 23 months ago. ( permalink )

The Winter Bear says:

Ok, frankly I'm facinated, and highly interested. Photographing some types of jewelry with a macro causes all sorts of shadowing problems, which I'm certain this little gadget would help alleviate.

I'm thinking some pure white LEDs, possibly with a frosted surface to help avoid reflections and "hot spots" on metal surfaces, maybe a few on adjustable "stalks" to highlight faceted stones... This is going to take a lot of thought! Thanks for the great idea.
Posted 22 months ago. ( permalink )

Hitoriki says:

do you think 8 ultra-bright white leds could do the job just fine?

and how did you cut the PCB in the form of a ring?
Posted 22 months ago. ( permalink )

fdecomite says:

this guy used the same tool as I did for making the hole :
images.google.com/imgres?imgurl=http://www.na turepixel.co...
It's called 'scie-cloche' in french, don't know the english term.
My first idea was to use 16 white led, but the seller only had 10 in stock, so I guess 8 might suffice.
On the other hand, I think the resistors are much too big, and i could have chosen lesser values to botain a more brilliant ring.
Posted 22 months ago. ( permalink )

Hitoriki says:

ah! that was what i thought to use as a tool to drill the ring...

i have a kit of these circular saws, but i don't know if i have the size i need (55mm)

what have you done for electronics? i designed a transistor-based current source (emitter follower) to supply me with around 104mA, thats enough to power 8 ultra bright LEDs in a parallel conection, each one drawing 13mA of current. i think it's reliable, and more power efficient
Posted 22 months ago. ( permalink )

Hitoriki says:

as i measured here in my protoboard, 1 ultra bright white LED gets it's highest luminance when supplied with 13mA to 15mA

linking 8 of these toghether in parallel, they become a current divider, so the net will draw 8 x 13mA = 104mA

more than 15mA would problably toast the LEDs (maybe not immediatly, but in a very short period of work), as i've seen a few times - he gets redder and redder, than goes out forever
Posted 22 months ago. ( permalink )

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Taken with a Canon PowerShot S3 IS.
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Taken on January 12, 2008
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Ring macro leds

Comments

fdecomite says:

oskay says:

cyenobite says:

kd1s says:

mkgphotoatgmail says:

Quinean says:

The Winter Bear says:

Hitoriki says:

fdecomite says:

Hitoriki says:

Hitoriki says:

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