Would be nice to have something like this!

[Vivek]

Officially announced: Canon EF-M 28mm f/3.5 Macro IS STM Lens! – mirrorlessrumors

A macro lens with a built in LED. Canon have come up with one, the first mainstream company to do this.

YASUHARA/NANOHA

Nanoha has a macro lens (for NEX) but the Canon LED implementation is so much more elegant!

 

[bipbip]

... the first mainstream company to do this.

Not quite. First there was:
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/special/120medical.htm

Then:
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/special/250medical.htm

 

[Vivek]

bipbip, I believe a continuous light is disticntly different from a ring flash.

 

[bipbip]

bipbip, I believe a continuous light is disticntly different from a ring flash.

Depends if the end result is for still image or video.

 

[JoelM]

I think that the Medical Nikkors had pilot (modelling) lamps for focusing and they were incandescent but obviously not as bright as the new LEDs are.

Joel

 

[Stefan Steib]

There also was a Yashica medical lens - but also a ring FLASH.

http://macrospheres.com/2013/12/29/i-too-can-do-macro-yashica-medical-100mm-dx/

http://macrospheres.com/wp-content/gallery/equipment/oly510-w-yashica-100mm-dx-02.jpg