> The electronic rangefinder should not work as max. aperture is 8
It does, although it's not terribly accurate. None of the focusing methods are all that accurate, EXCEPT LiveView, which is by definition very accurate.
All of these were shot without the benefit of LiveView (I think they're all from the D2h, which doesn't have LiveView at all).
I have a lot of shots with slightly missed focus, but the ones that come out are surprisingly good. These days I use the lens mostly for when I might need 500mm but don't want to (or cannot) lug around a big lens.
These are literally from the Tamron 500/f8 SP Reflex, but I've owned two Nikkor Reflexes, a Reflex-N (the latest model with the orange stripe and an older Reflex-C). The Tamron is essentially indistinguishable from the Reflex-N except at distances under about 10 feet, and is clearly superior to the Reflex-C. If you're going to use it as a pseudo-macro lens with an extension tube, the Reflex-N is better.