Wow Kali -I have no idea of what you mean by a double set of extension tubes - but boy do they work well! This is fantastic. Thank you for entering it in the backlit challenge.
@robz@helenhall extension tubes fit between the camera body and the lens to increase magnification, they just basically hold the lens further from the focal plane , i have really cheap ones but have to go manual because they dont communicate with the camera., much cheaper than a macro lens!
