Tamron SP 90mm f/2.8 Macro 1:1 (172E) Adaptall-2

Most macro lenses of the 1990s were optimized for flat copy work and looked it on a face: crisp, sterile, and dead behind the subject. The Tamron SP 90mm was the one a portrait shooter would reach for on purpose. The Adaptall-2 system is why it could pull that double duty across a whole shelf of cameras. One optical barrel, a swappable mount adapter, so the same 90mm could ride a Nikon body this week and a Canon FD or Pentax K body next. This is the 172E, the 1:1 manual-focus version that arrived in 1996 after the earlier 52B and 52BB topped out at half life-size. Tamron was already shifting to dedicated autofocus mounts by then (the AF 72E shipped alongside it), so the Adaptall barrel was the close of that chapter, not the opening of the next.

Wide open at f/2.8 it is sharp in the center and holds up well toward the edges, but the draw here is what sits behind the plane of focus. The 90mm Tamrons earned a real reputation for it. Japanese shooters nicknamed the family Tamukyu, and Tamron leaned into the "portrait macro" tag for years, because the out-of-focus wash is genuinely smooth and the bright points in the background go soft instead of ringed. The handoff from sharp to blurred is gradual, which flatters skin. Stop down to f/5.6 or f/8 for close work and the rendering tightens up, pulling fine detail off a subject the way a dedicated macro should.

Color runs neutral, a touch warm. Contrast is moderate rather than aggressive, and flare stays in check for a lens this old as long as the dedicated hood is on. The honest catch is the focus throw. Running from infinity to 1:1 is a long, deliberate turn of the barrel, perfect for nailing a macro frame and slow for catching a candid. You learn to set the magnification, then rock the camera in and out to land focus. The 55mm filter thread is small and cheap to feed, handy if you keep a polarizer on hand for wet leaves.

These days the 172E sits in the affordable end of the respected range. People weigh it against the autofocus Tamron 90s that followed and against macro Planars from Zeiss, and they still buy it, partly because the Adaptall mount adapts cleanly onto mirrorless bodies with a dumb adapter, manual focus and all. Macro and unhurried portraiture do not miss autofocus much.

One metering note. At 1:1 you rack the lens out far enough to lose serious light to extension, two full stops by the time you hit life-size, since the bellows factor at 1:1 works out to 4x. A camera meter reading through the lens catches that automatically. A handheld reading or a flash calculation will not. Zone Light Meter works the bellows factor from your reproduction ratio, so the indicated exposure already folds in the extension loss. That correction is the whole game the moment this lens goes on a body that does not meter through the glass.