Made between: 1979 to 1999

Specs:

Focal length: 2X the focal length of original lens	Weight: 310g (with the PK mount)
Optical design: 6 elements in 5 groups	Mount: Tamron Adaptall-2
Covers: Standard 35mm film size (24×36 mm negative)

Image quality

Tested this with a Tamron Adaptall-2 135mm f/2.5 (03B)

Build quality

Very well made and are solid as a rock.


Conclusion

A very nice teleconverter with good image quality.
Sharpness holds up well and bokeh still looks great.
But some contrast loss are there.

This is appartantly designed for lenses with a focal length of 90mm and longer.
And some adaptall lenses can't be used fully.
Tried this with the Tamron Adaptall-2 28mm f/2.5 (02B) and the back lens elements hit the inside of the teleconver when it was closer to infinity.
So it could not focus to infinity but could work for closer focusing.


Thumbs up:
Image and build quality
Bokeh


Thumbs down:
Can't be used fully with all adaptall lenses.

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Technical Info

Digital
Canon 500D with lens mount adapter
Auto White Balance and ISO 100