Tamron SP 2X Tele-Converter Model 01F: This 2X converter,
compatible with most Adaptall-2 mount lenses, provides very good optical
performance. The 6 element, 5 group optical design is housed in a moderately
long barrel which is about twice the length of conventional 4 element 2X
converters. The flat field optical design minimizes off-axis aberrations;
spherical and chromatic aberrations are also extraordinarily well controlled.
Tamron's literature states that this converter is designed for lenses with a
focal length of 90mm and longer. Nevertheless this converter performs well with
all Tamron zoom lenses which have a stationary master group (the rearmost group
of lens elements). This converter can also be used with many Tamron wide to
tele zoom lenses for doubling macro magnification, and usually results in
better off-axis macro performance.
Note that Tamron also produced the very rare SP 2X Tele-Converter
Model 200F. The 200F converter was designed to be used with Tamron's SP 300mm
F/2.8, SP 400mm F/4, SP 200-500 F/5.6, and the SP 350mm F/5.6 and SP 500mm F/8
mirror lenses. The 200F converter can not be used most other Tamron lenses
since the converter's front element will come in contact with the lens's
rearmost element when you try to attach the converter.
||2X the focal length of original lens
f/5 64, AE
(Original lens F number x 2)
|Angle of View
(Groups / Elements)
|5 / 6
|Min. Focus from Film
||Retains the min. focus of original lens.
||2X the mag. ratio of original lens.
|Length at Infinity in.
||8.8 oz. (250g)