Maven B.2 9X45 Review

[@user-ry4rn7hp8p]

Hi Dave. I've seen something similar to what you describe about the sharpness of this Maven B2 before, several times with Russian, Japanese and Chinese binoculars. I single this out as a separate type of defect... The last time I observed such a defect effect was with my new BOSMA APO 10x42, this is binoculars from Kunming United Optics (KUO), the same as the one that made a lot of noise on English-language forums - Sky Rover Banner Cloud APO 10x42. Even when the first reviews about Sky Rover appeared, BOSMA was already announced, it is the same model under two brands. By the fact that both of these brands apparently sell KUO products. So about the Maven B2 defect that you describe, or rather about its "ghostly sharpness", which I met earlier. As it was with my BOSMA APO, when looking at small details through binoculars, they become visible (unambiguously distinguishable) somehow gradually, at first I observe some blurring of the smallest details (for example, small letters in the inscription) - not clarity, then small details gradually appear and the inscription differs entirely, each letter. But if you take the binoculars away from your eyes for a while, and then look at the same objects again, then everything will repeat from the beginning, small details do not differ unambiguously (only some of them are the largest), it seems that small details float slightly and it remains so for a while, then it becomes clearer and more distinguishable. But the feeling that something is wrong remains all the time observing these details. Having watched so many times, I realized that my vision compensates for the lack of information from one eye with information from the other, and the brain puts it into a general image in which there is enough information, but gives a signal "something is wrong". At the same time, there is no pain in the eyes and head, this feeling is different. I checked my guess, looked with my left eye alternately through each half of the binoculars. All right. I asked my wife to look at it, she confirmed my observations. I mean, this is an optical flaw in one half of the binoculars, which causes the eye looking through it to see less detail, and the eye looking through the other half of the binoculars to see more. The brain gradually compensates for this disadvantage, gradually pulling up vision to normal, small details of objects are being drawn. I also noticed that in addition to the lack of sharpness in the right half, there is also less brightness, there is no explanation. The binoculars were sent back, and I am now in correspondence with the manufacturer. As I understand it, they have a different opinion, but I'm thinking of fighting. Regarding the model of the binoculars itself, I liked the very wide field (7.8°), excellent brightness and color reproduction. Excellent immersion in the image and the unexpected presence of a 3d effect, better than other Roof binoculars that I had. The sharpness that this model is capable of could not be estimated, for obvious reasons. Of the disadvantages, binoculars are heavy for 10*42 - 930 grams and Eye relief is not as big as we would like to see the whole field in sunglasses, the whole field is visible in corrective glasses. In general, provided that these defects are eliminated, I liked the binoculars, and so did my wife.

[@davidlytle3974]

Thank you Alex for coming through with this evaluation. I now have a working theory to explain the ghostly resolution found in my two Mavens. Also, people have been asking for a review of the new Kunming offering and you have given us one. I found it most interesting and helpful. At least, your Bosma didn't cost you $1500.00. Would you be able to live with the anomaly in the Bosma/Sky Rover, considering how inexpensive it is? Anyway, thanks again for coming through with your review. I really do appreciate it.

[@user-ry4rn7hp8p]

@@davidlytle3974 Such a defect as "ghost sharpness" will remind me of itself every time I look through binoculars, and annoy me, I have already suffered enough of this, so I am no longer ready to tolerate it. The presence of such a defect in binoculars means to me that I do not need it (binoculars). In addition, unlike a violation of collimation, this defect cannot be corrected.

[@deanherde805]

Well I tell you one thing. I ain’t cravin a Maven.

[@davidlytle3974]

That's a cute slogan that unfortunately now applies to me.

[@winnon992]

The Maven’s Sweet Spot must be small.

[@deanherde805]

@@davidlytle3974 I’m sure I’m not the only one who greatly appreciates your unbiased and concise reviews.

[@davidlytle3974]

I thank you Dean for the kind words.

[@davidlytle3974]

Winnon992, The sweet spot isn't small, just not super generous. The degree of focus fall off isn't horrible but it's noticeable after 60 percent out from center.