Minolta STF 135mm f/2.8 T4.5* lens

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The correct title of this article is Minolta STF 135mm f/2.8 [T4.5]* lens. The substitution or omission of any < > [ ] { } is due to technical restrictions.

Key features
Minolta STF 135mm f/2.8 [T4.5]*
Maker:	Minolta, Sony
Ultrasonic motor:	No
Macro capable:	No
Unique features:	Smooth Transition Focus
Application:	Smooth Bokeh
Technical data
Type:	Special Prime
Focal length:	135mm
Aperture (max/min):	f/2.8-[T]4.5 - f/32
Construction:	6 groups / 8 elements
# Diaphragm blades:	9/10 circular
Close focus distance:	87 cm
Max. magnification:	1/4
Physical
Weight:	730 g
Filter diameter:	72 mm
Accessories
Lens hood:	Bayonet
Angle of view
Horizontal:	18.2°
History
Introduced:	1999
Replaced by:	Minolta version succeeded by Sony version in 2006
Retail info
MSRP US$	$1200 USD (Sony version)

Originally produced by Minolta, and currently produced by Sony, the STF 135mm f/2.8 [T4.5]*, is a photographic lens compatible with cameras using the Minolta AF and Sony α lens mounts.

The STF is a manual focus only lens, due to use of an apodization filter that provides the high quality bokeh effect and is incompatible with the autofocus system used in Minolta and Sony SLRs.

The F-number in this lens refers only to the depth-of-field produced by its use. The T-number refers to the brightness of light which passes through the lens and is collected on the film or sensor.