Tamron SP 2X Tele-Converter Model 200F: Tamron also
produced the very rare SP 2X Tele-Converter Model 200F. The 200F converter can
be used with Tamron's 135mm F/2.5 model 03B, all manual focus SP 300mm F/2.8
lenses, SP 300mm F/5.6, SP 400mm F/4, Adaptall and Adaptall-2 70-350mm lenses,
SP 200-500mm F/5.6, Adaptall 200-500 F/6.9, plus 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**. Tamron specifically
designed this converter for professional photographers who use any of the
aforementioned lenses which this converter is compatible with. The optical
design is basically a "stretched out" version of the 01F design and uses high
diffraction glass. The result is superb off-axis performance even when the
master lens is used at its widest aperture. Off-axis image quality, depending
on the lens, is approximately 35% to 50% better than with the model 01F
converter. In other words, the corners of the image are noticeably sharper when
using this converter versus the 01F model.
||2X the focal length of original lens
f/5 64, AE
(Original lens F number x 2)
|Angle of View
(Groups / Elements)
|4 / 6
|Min. Focus from Film
||Retains the min. focus of original lens.
||2X the mag. ratio of original lens.
|Length at Infinity in.
||9.9 oz. (282g)
** We eventually will test which other Adaptall and Adaptall-2
lenses are compatible with this converter and list these compatible lenses. The
test is simply to see whether or not the converter's front element will come in
contact with the rear element or baffle within any given lens.