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I happen to really like the particular mid-70s look and feel of Adaptall lenses (more than the very tight and geometric design of most of their later Adaptall-2 counterparts) so I enjoy operating this lens more than the later Adaptall-2 version, but there's no denying that the optics clearly represent an earlier stage in design and engineering skills. Sharpness falls off noticeably towards the edges and chromatic aberration is also more evident.
My specimen has a large crescentic external slider for switching between manual and automatic aperture control, which I prefer for its more distinct operation over the more embedded implementations in later Tamron and Canon FD counterparts, as the latter designs usually require me to take my eye from the viewfinder and/or allow me to get locked in A when I didn't intend to.