TAMRON
Model 27A
Compact
CF Macro
Zoom
SP Symbol28~80mmF/3.5-4.2
Compact CF Macro Zoom
Tamron SP Adaptall-2 28-80mm F/3.5-4.2 Model 27A Lens

Tamron SP 28-80mm F/3.5-4.2 Model 27A: This lens definitely is an above average performer within its class even when compared to OEM lenses of the same era. Optimal optical performance is F/8 to F/11 at all zoom settings, and at these apertures this lens is very sharp. Macro performance is good between F/8 and F/22, but with a moderate drop of contrast in fine details towards the edges of the film plane. This is a very versatile lens which nicely covers the wide angle to slight telephoto zoom range, and which features decent built-in macro performance at the 80mm zoom position when using smaller apertures.

Lens Specifications:

Lens Model 27A
Focal Length 28 — 80mm
Aperture Range f/3.5~4.2 — 32, AE
Angle of View 75°~30°
Optical Construction
(Groups / Elements)
8 / 9
Min. Focus from Film Plane 14.2" (0.36m) at f=80mm
Macro Mag. Ratio [w/2X Converter] 1:3.4 [1:1.7] at f=80mm
Filter Size 67mm
Diameter 2.8" (70mm)
Length at
[w/Nikon mount]
3.2" (82mm)
[3.4" (86.5mm)]
Weight 16.9 oz. (480g)
Lens Hood Bayonet type #47FH (optional extra).
Accessory Accepts SP 2X tele-converter #01F.
Tamron SP 28-80 F/3.5-4.2
PERFORMANCE
Modern Photo's
Standard
as Tested
Focal length: ±5%
(26.60-29.40mm)
(76.00-84.00mm)
29.28mm
76.86mm
Aperture: ±5%
at 28mm: (f/3.33-3.68)
at 80mm: (f/3.99-4.41)
f/3.59
f/4.32
Distortion:
28mm: (±2.5%)
80mm: (±2.0%)
less than 1% (barrel)
less than 1% (barrel)
Light falloff: at f/5.6
+1 stop from theoretical limit
28mm: (0-2.0 stops)
80mm: (0-1.2 stops)
1.8 stops
1.0 stops
Tamron SP 28-80 F/3.5-4.2
F/no. RESOLUTION
at 28mm
at 1:48 magnification
CONTRAST
at 28mm
(30 lines/mm)
Center
Lines/mm
Corner
Lines/mm
Center % Corner %
3.5 66 42 48 28
4 66 42 56 34
5.6 66 42 57 48
8 66 47 70 54
11 66 47 64 49
16 66 42 55 46
22 53 42 44 40
32 42 33 34 34
Tamron SP 28-80 F/3.5-4.2
F/no. RESOLUTION
at 50mm
at 1:48 magnification
CONTRAST
at 50mm
(30 lines/mm)
Center
Lines/mm
Corner
Lines/mm
Center % Corner %
         
4 45 32 38 40
5.6 56 40 64 48
8 63 40 65 51
11 70 40 61 54
16 63 45 60 48
22 56 40 42 36
32 40 35 36 37
Tamron SP 28-80 F/3.5-4.2
F/no. RESOLUTION
at 80mm
at 1:48 magnification
CONTRAST
at 80mm
(30 lines/mm)
Center
Lines/mm
Corner
Lines/mm
Center % Corner %
4.2 42 33 28 26
5.6 59 37 38 36
8 66 42 50 39
11 59 47 48 38
16 59 47 49 37
22 47 42 38 36
32 37 37 34 35
Tamron SP 28-80 F/3.5-4.2
F/no. MACRO RESOLUTION
at 80mm
at 1:4.31 magnification
Center
Lines/mm
Corner
Lines/mm
4.2 39 34
5.6 44 34
8 49 31
11 55 39
16 55 39
22 44 39
32 34 31
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