Is there a lens mount adapter for nikon d80 and seimar/rokunar lens?

HI Folks

I have a NIkon d80 SLR and my husband has a bunch of old lenses he used to
use for his olympus ompc. But these are generic lenses so he had to use a
lens mount adapter. This adapter does not fit on the D80, but is there a
lens mount adapter that I can use for the D80 so I can use these nice
lenses?

THey are Rokunar MC auto zoom 1:5.6 75-300mm - no k8610109

the other is Seimar 1:6.3 , f=400m, 820788


I also have this SAKAR olympus flash, it is 77D-0. IS this compatible with
some kind of adapter?

Thanks sooo much


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