8 out of 10 points and recommended
Here's a post I came across in another forum:reviewed November 22nd, 2009
"I got this lens for my E-510, and for the price it's a great outdoor lens. But in the course of doing some experiments to try to work out various IS and focusing issues with legacy lenses, I had occassion to test it against a couple of Zuiko OM primes (135mm/f4.5 macro and 50mm/f1.4) and discovered, to my surprise, that at the "135mm" setting, the 40-150mm kit lens was considerably wider than the OM 135mm. It gets the same magnification only at its maximum "150mm" setting; and at that "150mm" setting, wide open (nominal f5.6), it seemed about a half-stop slower than the OM 135mm stopped down to f5.6."
TTesting against the 50mm OM, the 40-150mm kit lens had to be set at "53mm" to get the same FoV (I didn't test exposure)."
"So the "40-150mm f4-5.6" kit lens would be more accurately labeled a "43-135mm f4-6.3" lens. Still a bargain for the price, but some truth in labelling would be nice. And the recorded EXIF data on focal length and exposure with this lens will be somewhat off."
How come SLR Gear didn't bother to measure the actual (as distinct from advertised) focal lengths and zoom ratio? (No one else seems to have, either.)