Thanks. To be honest because the TC14 was already attached to the 105mm lens. But...., yes it does let you get closer ( the downside is it reduces the depth of field so you need more shots at different focus points).
Photoshop did a pretty good job of focus stacking but I had to manually adjust some of the layer masks to get the best clarity. I find less layers at high aperture work better than more at low aperture.