Tamron SP Adaptall-2 28-80mm F/3.5-4.2 Model 27A

Model 27A

Compact

CF Macro

Zoom

28~80mmF/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)
F/no.	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)
F/no.	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)
F/no.	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
F/no.	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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