Tamron SP 90mm F/2.5 Macro Model 52B and 52BB: A very good
1:2 macro lens with above average resolution and contrast. Performance is
fairly similar to Kiron's 105mm F/2.8 macro lens. Contrast is noticeably
improved by using the accessory lens hood to control stray light since the
front elements are barely recessed in the front of the lens. The model 52BB is
merely a cosmetically redesigned version of the original 52B. Tamron made an
optional accessory 1:1 extension tube for this lens. Alternatively you can
achieve 1:1 macro with good performance by using either a Tamron SP 2x
converter, a Kiron 7 element 2x converter, or a Tokina 7 element 2x converter.
Optimal aperture at all focus distances down to 1:4 is F/8. Optimal aperture
between 1:4 and 1:1 is F/11.
|| f/2.5 32, AE
|Angle of View
(Groups / Elements)
|6 / 8
|Min. Focus fromFilm
|Macro Mag. Ratio [w/2X
|Length at Infinity in.
||14.8 oz. (420g)
||Screw-in type #23FH (optional extra).
||Accepts SP 2X tele-converter #01F.