I can say beyond a doubt that the contrast on an 840 doesn't suck... I have one and have looked down TTs at the range and they are VERY close, maybe a smidge better for the TT. But that photo they show does NOT represent the glass in a ZCO well at all. I don't know what happened but that contrast doesn't look great in that photo, however shooting a couple thousand rounds down one in various conditions (including rain, snow, at Dawn and dusk) to my eye I was able to pick out any target no matter how battered and worn against similar colored backgrounds, something that was far more difficult in my NF 5-25 ATACR. Also I do have a newer ZCO (got it a year ago). Take it for what it is from my opinion, it's just that an opinion.