Not as good as Vanta black, but given that no one can purchase Vanta black (a novel nano carbon black material) it comes in as a respectable second. I used this when I refurbished my 150/Lunt 35 mod. Nothing beats having correctly positioned light baffles to prevent stray light, but augmenting this with a good flat black can only help.

I primed and painted using my usual grey primer and matte black top coat and then finished off with a couple of brushed coats of this product.

Thanks for the suggestions, Bob. I do have access to a reflectometer at work, so maybe this is I project to be undertaken at some point. I did find Black 2 to be pretty good with normally incident light and less good at oblique angles, so my thoughts here were more about reducing those stray reflections that bounce around that we can sometimes see. Light baffles will always be the most effective way of eliminating oblique angle reflections, of course......no light, no reflections.