The User's Review: Quantaray 2X (4 elements) vs. Kenko 2X MC7 (7 elements) Extenders, both with Minolta/Sony A Mount and 8 pins

1. The Quantaray 2X with 4 elements is more compact/smaller.
2. The Kenko 2X with 7 elements provides higher resolution (see the last image)
3. However, the longer tub and more glass in the Kenko 2X may need more light compensation.

The test devices used were a Minolta Maxxum 50mm F2.8 Macro Lens and a Sony A230 camera.

Image through Q 2X

Image through K 2X

Q 2X vs. K 2X (cropped from the two images above)