Optical formulas of the C/D series by Soligor are hard to come by.
The maker (Tokina for sure), the vintage (production period roughly overlapping), the presence of the peculiar 1:1 converter, and a certain resemblance in the size/shape of the barrel made me think it should be substantially the same lens.
Even the Tokina and Vivitar examples have certain differences, which IMHO were just due to commercial purposes, to differentiate the two products, which by the way share the same optical design.
Reporting a slightly different focal or speed between the OEM version and the rebranded one was quite common. Macros made by Komine or Kiron had similar commercially motivated differentiations. IIRC the two Vivitars were formally different from their Kiron or Panagor counterparts, but the lenses were optically the same.
I wouln't be surprised if the Soligor C/D followed the same pattern.
Regarding pictures. Some patience, please
I will post a couple of examples, but it will take almost 4 months to actually have the lenses in my possession.
EDIT:
This image of the Vivitar, referenced in an old thread on this forum, reveals a few similarities. Especially the 1:1 adapter.
I have some more doubts now, the filter diameter is 62mm, and not 58mm as the Tokina and Vivitar.
If somebody has a copy of an old magazine test that shows the optical layout of the Soligor C/D Macro 2.8/100mm, please chime in.
I'd love to know the truth
cheers
Paolo
Last edited by cyberjunkie; 10-29-2017 at 08:15 AM.