larger lens was helpful

#declare concav_glass_ = // f = -3.99984
difference { cylinder { <-.5,0,0>,<.5,0,0> 3 }
  sphere { <-4.0005,0,0>, 4 } sphere { <4.0005,0,0>, 4 }
  material { m_glass } photons { target reflection on refraction on }
}
object { concav_glass_ translate <-8 + 4.35,-10> } //4.137943

#declare maglass_ = // f =  8.275885
intersection {
sphere {  <7.2,0,0>, 8 }
sphere {  <-7.2,0,0>, 8 }
  material { m_glass } photons { target reflection on refraction on }
}
object { maglass_ translate <-8,2,-10> }

just a guess here from what looks best,
Distance to lens2 = radius reduction times focal-length(lens1) + lens2_impact


haven't found any real explanation of this yet.

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