Soligor 105mm f/4 on EBay

[StephanN]

I found the transmission of the Soligor 105mm f/4.5 to be almost exactly like the one of the EL-Nikkor 105mm f/5.6 (when tested at f/8), perhaps even a teeny-weeny-winy bit better, but you might get it at a better price, like this one:

 

https://www.ebay.com/itm/254309717873

 

Caution: no filter thread, so you'd need to glue on a filter-ring or use a clamp-on version or some other way of mounting the filter.