I just picked up a "For Super-Multi-Coated (S-M-C) Takumar-Zoom 85-210mm F4.5" diopter off this list. Doesn't seem to be an achromat and I don't think it's a +0.25. Looks to be more in the +0.3 or +0.4 range, but it was pretty soft compared to the +0.33 Minolta.