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Barlow magnification cam be adjusted.
Just try to move your camera sensor closer to barlow, if possible.
BTW, I am using tele-converter (2x) instead of barlow, and I can get 3~4x with additional extender rings.
There are 1.4 converter versions, 2x also work if adjusted like I mentioned above (not always possible with DSLR's, as the flange-sensor distance is fixed to 44.5 or 45.5 mm)..
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