Top critical review
7 people found this helpful
Poor collimation results in a doubled image; other than that, excellent.
on 15 February 2015
Two different pairs, both sold by Amazon, had very poor collimation. The second pair was supposed to replace the defective unit, but turned out to be even worse. On both pairs the collimation is bad enough for the image to double significantly. My £5 binoculars (which are horrible in every other way) have better collimation than these two pairs! I can twist and pull the tubes into alignment by force, getting an amazing picture, but as soon as I let them go, the image doubles up again. By adjusting the hinges, opening one of them more and the other one less, I can get one of the two pairs to align enough to remove the doubling, but not the other one. I don't think I'm supposed to do it like this anyway; it just shows that the hinges are not precise enough.
Other than that, this looks like a very nice model. The image is very clear and the build feels very solid. It's nice and rubberised all over. Two caps are included, but they fit on either end. There's some chromatic aberration, but not excessive. The eyes have to be positioned fairly precisely in the sweet spot, else the image dims slightly on one of the edges.
The viewing angle is very good; I've measured it to be ~6.5-6.6° edge to edge, which matches the claimed apparent viewing angle of 65° at 10x. The image is slightly soft outside of the central 40° or so, but this is only noticeable if I specifically look for it; in normal use this is not noticeable. The eyes have to be pretty close to the eyepieces to get the full angle, else the field of view shrinks. Close enough for the eyelashes to touch the glass.
Like others have mentioned, the focus ring does not have a perfect consistency as I turn it; it sometimes becomes a bit stiffer than normal until rotated past the stiff point. It doesn't have any play though: the tiniest tweak back or forth has an effect on focus. The right eyepiece focus is very stiff - annoying to adjust, but feels like it will stay put once set. I don't have any issue with either of these; very minor points for me. The depth of field is OK - not super impressive, but doesn't seem bad either.