Tamron SP Adaptall-2 35-80mm F/2.8-3.8 Model 01A

Model 01A

High Speed

CF Macro

Compact

Zoom

35~80mmF/2.8-3.8
High Speed CF Macro Compact Zoom

Tamron SP Adaptall-2 35-80mm F/2.8-3.8 Model 01A Lens

Tamron SP 35-80mm F/2.8-3.8 Model 01A: Tamron's SP 35-80 F/2.8-3.8 zoom lens is, without question, the best zoom lens ever manufactured within its class and price point. The sharpness and contrast of this lens is extraordinary compared to similar after market lenses and many OEM lenses. Only the similar Nikkor performs better, but not by very much. Macro performance across the central two thirds of the film plane stands up very well against dedicated macro lenses. Amazingly, this lens yields very good macro performance across the entire film plane when used with Tamron's SP 2X tele-converter. There is no push button or macro ring which must be turned to enter the macro mode. The user merely has to continuously turn the focus ring in order to focus from infinity to the minimum focus distance for macro work. Tamron calls this feature "continuous focusing" or CF. While turning the focus ring, the zoom ring will automatically turn as necessary until the zoom ring is at the 80mm zoom setting.

This lens is an above average yet somewhat rare lens because, shortly after its introduction, numerous other manufacturers and Tamron had begun selling lenses with the more appealing 28-80 or 28-85 zoom ranges. Thus sales of this lens were somewhat slow even though Tamron extended the production of this lens by several years. The only notable optical defect within this lens design is a slight excess of barrel distortion (around 2.5%) at the 35mm position. This barrel distortion rapidly disappears to nearly zero when zooming to the 80mm position. In other words, this lens delivers extremely good optical performance, is quite versatile and is fairly compact. Lens flare is very well controlled at all zoom settings.

Lens Specifications:

Lens Model	01A
Focal Length	35 — 80mm
Aperture Range	f/2.8~3.8 — 32, AE
Angle of View	64°~30°
Optical Construction (Groups / Elements)	8 / 9
Min. Focus from Film Plane	10.6" (0.27m) at f=80mm
Macro Mag. Ratio [w/2X Converter]	1:2.5 [1:1.25] at f=80mm
Filter Size	62mm
Diameter	2.5" (64.5mm)
Length at [w/Nikon mount]	2.8" (72mm) [3.0" (76.5mm)]
Weight	13.6 oz. (386g)
Lens Hood	Push-on type #25FH (optional extra).
Accessory	Accepts SP 2X tele-converter #01F.

Tamron SP 35-80 F/2.8-3.8

PERFORMANCE

Modern Photo's
Standard

as Tested

Focal length: ±5%
(33.25-36.75mm) (76.00-84.00mm)	35.87mm 76.52mm

Aperture: ±5%
at 35mm: (f/2.60-3.00) at 80mm: (f/3.53-4.07)	f/2.82 f/3.96

Distortion:
35mm: (±2.5%) 80mm: (±2.0%)	2.5% (barrel) less than 1%

Light falloff: at f/5.6 +1 stop from theoretical limit
35mm: (0-1.87 stops) 80mm: (0-1.19 stops)	0.50 stops 0.25 stops

Tamron SP 35-80 F/2.8-3.8
F/no.	RESOLUTION at 35mm at 1:50 magnification		CONTRAST at 35mm (30 lines/mm)
F/no.	Center Lines/mm	Corner Lines/mm	Center %	Corner %
2.8	56	35	46	21
4	70	40	65	26
5.6	63	40	65	35
8	63	56	65	35
11	63	56	66	50
16	63	50	60	50
22	63	44	50	45
32	56	35	42	42

Tamron SP 35-80 F/2.8-3.8
F/no.	RESOLUTION at 60mm at 1:51 magnification		CONTRAST at 60mm (30 lines/mm)
F/no.	Center Lines/mm	Corner Lines/mm	Center %	Corner %
2.8	46	46	42	36
4	51	51	66	38
5.6	65	57	67	40
8	65	57	72	48
11	57	57	68	50
16	57	51	58	48
22	46	46	48	48
32	46	41	32	38

Tamron SP 35-80 F/2.8-3.8
F/no.	RESOLUTION at 80mm at 1:65 magnification		CONTRAST at 80mm (30 lines/mm)
F/no.	Center Lines/mm	Corner Lines/mm	Center %	Corner %
3.8	65	52	52	24
4	65	52	52	24
5.6	68	52	68	34
8	73	75	72	42
11	73	73	75	53
16	73	65	68	56
22	65	65	58	48
32	52	52	45	36

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