Macro - 2 sets of manual extension tubes + soviet Jupiter 135mm HD

Macro - 2 sets of the manual extension tubes + soviet MC Jupiter - 37AM 3,5/135mm + Nikon D3100 body. Just arrived the second set of the manual extension tubes. Last time I tried the shooting with the "nikon" chinese manual tubes - now I have the second set of M42 manual tubes. So I tried to use both sets with the very old but very nice soviet manual lens Jupiter. The magnification you can count from the photo of the meter - 1,1 : 1 so a little higher magnification than by the normal macro lenses like NIkon or Sigma 105mm, Tamron 90mm etc... but the focusing distance is about 30cm from the front part of the lens... so about 55cm from the chip. No flash, the photos of the insect all handhold 1/250.