TAMRON
Model 52B
Tele-Macro
Super Portrait
SP Symbol90mmF/2.5
Tele-Macro Super Portrait
Tamron SP Adaptall-2 90mm F/2.5 Model 52B Lens

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.

Lens Specifications:

Lens Model 52B
Focal Length 90mm
Aperture Range f/2.5 — 32, AE
Angle of View 27°
Optical Construction
(Groups / Elements)		 6 / 8
Min. Focus fromFilm Plane 15.3" (0.39m)
Macro Mag. Ratio [w/2X Converter] 1:2 [1:1]
Filter Size 49mm
Diameter 2.5" (64.5mm)
Length at Infinity in. (mm)
w/Nikon mount		 2.6" (66mm)
[2.8" (70.5mm)]
Weight 14.8 oz. (420g)
Lens Hood Screw-in type #23FH (optional extra).
Accessory Accepts SP 2X tele-converter #01F.
Tamron SP 90mm F/2.5
PERFORMANCE
Modern Photo's
Standard		 as Tested
Focal length: ±5%
(85.50-94.50mm) 88.49mm
Aperture: ±5%
(f/2.38-2.63) f/2.58
Distortion:
(±2.0%) less than 0.5% (pincush.)
Light falloff: at f/5.6
+1 stop from theoretical limit
(0-1.15 stops) 0.15 stops
Tamron SP 90mm F/2.5
F/no. RESOLUTION
at 1:48 magnification		 CONTRAST
(30 lines/mm)
Center
Lines/mm		 Corner
Lines/mm		 Center % Corner %
2.5 49 55 49 28
4 62 55 72 54
5.6 62 55 76 60
8 69 62 66 55
11 69 62 64 52
16 62 62 53 47
22 55 49 45 40
32 44 44 33 30
Tamron SP 90mm F/2.5
F/no. MACRO RESOLUTION
at 1:4 magnification
Center
Lines/mm		 Center
Lines/mm
2.5 41 46
4 58 52
5.6 65 52
8 58 58
11 58 58
16 58 52
22 52 52
32 52 52
Tamron SP 90mm F/2.5
F/no. MACRO RESOLUTION
at 1:2 magnification
Center
Lines/mm		 Center
Lines/mm
2.5 33 33
4 37 33
5.6 47 33
8 53 47
11 59 59
16 59 59
22 53 53
32 53 47
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