Still adding to my lighting collection
Bought an Aputure Amaran Halo LED Ring Flash
This one was a bargain at about $80 (CDN$)  
Bought from "The Camera Store"  
Aputure Amaran Halo LED Ring Flash - Nikon Mount  
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Here are a couple of sample shots - taken with a 60mm Nikkor Macro 2.8 lens using this new ring light. 
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I like the way that you control the amount of light and by choosing only to turn on half the ring and rotating the ring you can control the direction of the light.  The ring sits around the lens and it came with a set of rings for most common sized lenses.  
If shooting with a ultra wide there is a 'bit of vignetting" 
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Turning off one side of the ring give some creative options. 
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Of course my 77mm is not a macro and the ring light is designed for macro work. 
Mind you there is a new macro I have my eye on that is 77mm.  It is a wide angle tilting macro
The Venus Optics 15mm f/4 Macro Lens by Laowa 
https://www.bhphotovideo.com/c/product/1165600-REG/venus_optics_laowa_15mm_f_4_macro.html  I had a chance to put this lens on my D610 at a camera show last year before it was available for sale in Canada - very interesting.  I would suspect this ring lens would vignette on it the same way it is vignetting on the lens above at 17mm.  
Anyway, back to to the ring light. 
It can either be constant lighting or it will flash.  Not sure if there is any advantage to just having it flash.  I wonder if the intensity is greater or if the LED's are just flicked on for a second?  I also found that it would not flash in "A" priority, but did in "M".  Didn't try other modes.  Would have to experiment to see if there is any advantage to the 'flash" mode.  LED's run forever on a set of batteries so saving power isn't likely the reason.  Perhaps if you were shooting a light sensitive subject maybe?  Any suggestions? 
Only complaint so far is that the battery door is hard to open or close, one would have to be very careful not to break it. 
But I have only played with it a little, not a true test of the light.  
Now to go find me something worth macroing ....