Viper versus Razor...
When I was shopping for an new 8 power, I spent time comparing the Conquest HD, the Viper HD and the Razor HD.
Briefly
- the Conquest has a very nice clear view through the center (all joking aside as in "what part of the glass are you looking through?"), nice and sharp but there was a distinct diminishing in quality (clarity) towards the edge. And eye placement for me was difficult. Adjusting the eyepieces and IPD did not help, for me anyway.
- the Viper HD had very nice, clear sweet spot, comparable to but slightly wider than the Conquest, but also begin to suffer towards the edge. An example would be that the lenses darkened towards the edge of the field of view. Eye placement was not as difficult however.
- the Razor was clear(er) than the Viper HD. The quality of the view was as good as the Conquest HD and maintained a better quality of view towards the edge of the field. By that I mean, the lens did not darken as on the Viper and unlike the Conquest, there was not a marked deterioration away from the sweet spot. Eye placement is also finicky, too difficult for me at least. And the focus wheel is - for the lack of a better way to say it - too fast.
So I purchased the Viper HD. It was the combination of factors that helped me make my decision. 1) a nice sweet spot and less fall off in quality towards the edge than the Conquest HD, 2) the objective lens covers work, unlike the Conquest HD presentation, and 3) I can get functional eye placement for me - with my prescription lens, the deciding factor when trying to choose which one to purchase.
For me, the Razor HD is not worth twice the price of the Viper HD.
I wanted to like the Conquest HD and tried many times to get it adjusted to my eyes...no joy. The Razor HD never fit despite its minutely better quality view.
Finally, I found the 10 power Conquest HD actually better than the 8 power version, the eye placement was more forgiving and I enjoyed using it as a result. The Razor HD in 10 power was not significantly better than the 8 power version...as noted, eye placement and focus wheel killed what is otherwise a nice design.
This is limited by my lack of experience with optics. And as I get older, I begin to question whether my eyes are capable of consistently performing well enough to take advantage of the "benefits" of the improvements in question.
So based on my experience, I would not feel cheated with the Viper HD. And would pocket the difference and go to Old Blighty to see the Red Kites and Hobby Falcons.:t: