Seven reflective surfaces in different size reveals that Rokkor 45mm/f2.8 forms some similar triplet type of lens design like an old Elmar 50mm/f3.5 and Carl Zeiss Tessar 45mm/f2.8 though posterior group is glued, that was built in Minolta Uniomat range finder camera. Focusing is done by rotating or straight helicoid movement of only front element. Deeper consideration about Triplet lens produced by various companies, several similar types were under construction in old days. We know that Gaussian design is far superior to Triplet, the atmospheric resolution are different each other, I prefer latter one to the former. Consequently, not to seek the better but to do some different resolution in the lens tastes.
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