Hi Rob:
'are these controls operational' - yeah you wish
Tom:
Yes I do use an 8 inch, x1.5 maginification lense which is also LED daylight lit. This in addition to an overhead ceiling mounted LED studio light.
Even so, when threading 0.08 mm line through a 0.4 mm tube, I still need to rest my eyes and take a break every now and then.
Mike