Macro Ring Flash

How does is this ring flash triggered exactly?

http://www.overstock.com/Electronics/Bower-ITTL-Auto-Nikon-Digital-Camera-Macro-Ring-Flash/4302503/product.html

I understand what a ring flash is supposed to do, but the other question crossed by mind.
@ Fos: Before you try to make jokes and make remarks about Americans, maybe you should make sure you “esl” is correct first. You have plenty of run-on sentences and misspellings to worry about. I don’t care if its your third or fifth language, you just better have your stuff together before you try to insult others…..just sayin…..

See how part of it is sitting on the camera, and then a wire runs to the ring part on the lens? Well, the flash is attached to the hot shoe connector on top of the camera, and the hot shoe sends a signal to trigger the flash when you take a picture – there are electrical contacts on both the camera and the flash.

EDIT: The part on top of the camera and the ring part are one piece, with a wire connecting them.

DIY DSLR Ring-Flash part 1 of 2

Vivitar Digital Macro Ring Flash DR5000 for Canon T3I T2I T1I 600D 550D 100mm 60 $59.99

TTL Macro Ring Flash DRF14 for Nikon for D400 D300S D800 D700 D90 D4 D3X D7000 $95.00

Konica Minolta Macro Ring 1200 Ring Light/Macro Flash Maxxum 1200AF FS-1100 A++ $183.00

48LED Flash Macro Ring All/Outside/Inside Light +49mm Adapter+Charger For Camera $36.79

Macro Close-Up O Ring LED Flash Gun E2J Light For Canon $33.67

Macro ring LED light flash for Nikon D3100 D5100 D7000 $39.87

Macro Close-Up O Ring LED Flash Gun Light Lighting $35.95

LED Macro Ring Flash light f Nikon D300 D3100 D90 D80 D7000 D5100 /7 ring mounts $29.99

JY-670 Macro Ring Close-UP O Flash Gun for Canon Nikon Olympus Pentax Samsung $116.89

Macro O Flash Ring For CANON Nikon Sigma Metz F170 $28.90

Macro O Flash Ring For CANON 550EX 430EX 580EX II F160 $28.90

Macro O Flash Ring For CANON Nikon Metz Sigma F175 $28.90

Bower Macro Ring Light for Close-Up Flash Photography $74.95

BOWER MACRO RING FLASH For Nikon D3000 D300S D5000 D3S 52mm Digital SLR Cameras $91.89

Yongnuo LED Macro Ring MR-58 Flash Light for Nikon Canon Pentax DSLR Camera $46.55

Macro Ring Flash for Canon XTi XSi XS T1i 40D 50D 5D 7D $49.98

Macro Close-Up O Ring flash for Canon Nikon Pentax Olympus as Canon MR-14EX $123.69

Nikon SX-1 Attachment Ring for R1C1 and R1 Macro flash $74.99

58pcs LED O-Ring Ring LED Light & Macro Flash for Canon Nikon DSLR Camera EOS 7D $49.99

MACRO RING FLASH LIGHT For Olympus Digital E-510 E-410 E-400 58mm SLR Camera New $91.89

Brand New Canon MR-14EX Macro Ring Lite E-TTL Flash for Closeup MADE IN JAPAN $566.55

Digital Flash Light Macro Ring For Pentax K-100D K-110D Digital SLR 52mm Cameras $91.89

YONGNUO MR-58 Macro LED Macro Ring Flash light for Nikon DSLR cameras $43.55

Meike LED Macro Ring Flash/Light FC100 For Canon Rebel XTi XS T3i 1100D 600D 60D $41.99

Ring Flash for Canon FD 50mm f/3.5 100mm f/4.0 Macro $99.99

Professional FLASH Light Macro Ring For Olympus 58mm SLR E-3 E-1 E-5 E-600 E-300 $91.89

Digital Macro Ring FLASH Light For Canon EOS Digital SLR 58 mm Cameras By BOWER $91.89

48 LED Macro Ring Video Camera Light Flash Lamp $26.99

Dedicated ADI/PTTL Macro Ring FLASH Sony A450/A550/A500 $129.10

Bower SFD14N Macro Close-up Ring Light Flash for Nikon SLR D800 D300A D40 D40X $109.00

Professional Macro RING FLASH For Canon EOS 1000D 600D 7D 1100D Digital SLR 58mm $91.89

Nikon Speedlight SB-29 Ring Light/Macro Flash tested nice working $199.00

Dedicated ADI/PTLL Macro Ring Flash FOR Sony Alpha SLR $129.10

Professional Macro Ring Flash Light FOR Sony Alpha A-290 A-390 A-580 55mm Camera $91.89

Super RING FLASH Macro For Nikon D7000 D3100 D5100 52mm SLR Digital Camera BOWER $91.89

Nikon Speedlight SB-29 Ring Light/Macro Flash-Complete W/accessories $175.00

eTTL Macro Ring Flash for Canon EF 50mm 60mm 65mm 100mm $140.39

Nikon Speedlight SB-29 Ring Light/Macro Flash $200.00

OLYMPUS OM MACRO FLASH SHOE RING $129.00

OLYMPUS OM T10 T 10 TTL MACRO RING FLASH 1 NEW BOX $149.00

OLYMPUS OM T8 T 8 TTL MACRO RING FLASH 2 $299.00

OLYMPUS OM T8 T 8 TTL MACRO RING FLASH 2 NEW BOX $349.00

Canon MR-14EX TTL Macro Ring Lite Flash with E-TTL Guide Number 14m/46′ NEW $528.00

GODOX ML-150 Macro Ring Flash Light For Canon EOS 550D 60D 600D 1100D 50D $77.99

Zeikos Digital Macro Ring Light Flash for Nikon Camera $99.95

Zeikos Digital Macro Ring Light Flash Nikon Camera Kit $105.95

Zeikos Digital Macro Ring Light Flash Canon EOS Camera $99.95

Zeikos Digital Macro Ring Light Flash Canon EOS Camera $105.95

F155 macro o flash ring adapter for Nikon SB600 D80 D70S D90 $36.79

Macro 48pcs LED Ring Flash RF550D for Nikon &Canon brand DSLR RF-550D $52.15

JY-670 Flash Strobe Macro Close-Up Ring Canon 60D 5D MARK II 50D 7D for MR-14EX $96.99

JY-670 Flash Strobe Macro Close-Up Ring Nikon D800 D7000 D700 D3 D90 D200 D300 $96.99

MINOLTA Macro 1200 AF Ring Flash Ring light $85.00

Vivitar Digital Macro Ring Flash DR5000 for Sony A77 A65 A55 A33 A580 A550 A390 $59.99

Meike MK FC 100 Macro LED Ring Flash Light For Sony Alpha A500 A200 A850 $48.00

Nikon Speedlight SB-29 Ring Light/Macro Flash. NEW, only tested once. $288.00

Sigma 77mm Adapter Ring for EM-140 DG Macro Ringlight Flash F30S13 NEW $18.97

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