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As Graeme just said, that's the unusual thing about the x2.5 powermate. You can see the graph at Bintel when you click on the further info link on the powermate page.
The best use for the x5 powermate is with CCD imaging. There you can use a CCD camera's ability to take long exposures to get the light onto the chip. But, as I said earlier, the bigger your aperture, the more light you'll gather, the brighter the image (to a certain extent...you can bump up the FL too far even for a big aperture).
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