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Maven B3 8x30 ... (3 Viewers)

Frank D., It's Been At Least A Week Since Buster Brown Dropped Off The Mavens.

Your Fans Are Anxiously Awaiting Your Review.

Inquiring Minds Need To Know.
 
Frank D., It's Been At Least A Week Since Buster Brown Dropped Off The Mavens.

Your Fans Are Anxiously Awaiting Your Review.

Inquiring Minds Need To Know.

Patience Brock... good things take time. But I'll confess, I was hoping to find a good read here after laboring all weekend on a spring clean of the garage.

CG
 
Frank D., It's Been At Least A Week Since Buster Brown Dropped Off The Mavens.

Your Fans Are Anxiously Awaiting Your Review.

Inquiring Minds Need To Know.

Can't speak for Frank or give a formal review as the binocular I purchased went to my
older brother.

I will say they are a damn fine binocular, do they compare to my 10x50 and 8x32 sv's, no.

But, they weren't purchased for this reason.

And in saying this with the short time I spent with them they are closer to the 8x32 sv then any other 30- 32mm binocular I have tried as of late!

Take it for what it's worth and try not to blow it out of context.

This isn't a $2000 binocular!

Still, a really fine example what's available now in the midrange.

Bryce...
 
Can't speak for Frank or give a formal review as the binocular I purchased went to my
older brother.

I will say they are a damn fine binocular, do they compare to my 10x50 and 8x32 sv's, no.

But, they weren't purchased for this reason.

And in saying this with the short time I spent with them they are closer to the 8x32 sv then any other 30- 32mm binocular I have tried as of late!

Take it for what it's worth and try not to blow it out of context.

This isn't a $2000 binocular!

Still, a really fine example what's available now in the midrange.

Bryce...

Thanks. Those brief comments certainly whet my appetite for Frank's much awaited comprehensive review. I'm interested in how the Maven compares to the 8x30 M7, which Frank has tried (although he got a defective sample with the bare metal parts and veiling glare).

What did your brother say about the Mavens, and what did you think of the eyecups?
 
Thanks. Those brief comments certainly whet my appetite for Frank's much awaited comprehensive review. I'm interested in how the Maven compares to the 8x30 M7, which Frank has tried (although he got a defective sample with the bare metal parts and veiling glare).

What did your brother say about the Mavens, and what did you think of the eyecups?
I think the Maven's B.3 8x30's are a Nikon M7 8x30 without the glare. That summarizes it.
 
Dennis, post 126,
It is kind of a puzzle how the Maven B3 s relate to the Nikon Monarch 7 30 mm's and to the Kite Lynx 30 mm's.
The weight of the Mavens is practically identical to the Lynxes:
Maven B3 8x30= 461 g while the Lynx 8x30 is 462 g
Maven B3 10x30 = 468 g, while the Lynx 10x30 also stops at 468 g
The Monarch 7's are lighter (433 g and 435 g) , but that could come because Nikon has used more plastic parts in the body of the Monarch's as compared with the Lynxes.
FOV of the Nikon Monarchs is almost the same as from the Maven B3's 145m and 144m/1000m for the 8x and 117m and 114m/1000m for the 10x.
Close focus values are also comparabe for the Monarchs and the Mavens ( 2,4 and 2 m for the Monarchs and 2,5 m for the Mavens).
With respect to FOV the Lynxes score higher with FOV's of 151m/1000 m for the 8x and 136m/1000 m for the 10x.
Close focus of the Lynxes is shorter with 1,3 m for both the 8x and the 10x.
So my hypothesis is (for what it is worth) that Maven has used the Kite Lynx bodies, with more metal parts and the optics of the Monarchs.
A puzzle remains the very high transmission values listed for the Mavens on the Maven WEB-site, which are hard to believe even in 30 mm binoculars with SP prisms in a much higher price range, but further research may enlighten us.
Gijs
 
Dennis, post 126,
It is kind of a puzzle how the Maven B3 s relate to the Nikon Monarch 7 30 mm's and to the Kite Lynx 30 mm's.
The weight of the Mavens is practically identical to the Lynxes:
Maven B3 8x30= 461 g while the Lynx 8x30 is 462 g
Maven B3 10x30 = 468 g, while the Lynx 10x30 also stops at 468 g
The Monarch 7's are lighter (433 g and 435 g) , but that could come because Nikon has used more plastic parts in the body of the Monarch's as compared with the Lynxes.
FOV of the Nikon Monarchs is almost the same as from the Maven B3's 145m and 144m/1000m for the 8x and 117m and 114m/1000m for the 10x.
Close focus values are also comparabe for the Monarchs and the Mavens ( 2,4 and 2 m for the Monarchs and 2,5 m for the Mavens).
With respect to FOV the Lynxes score higher with FOV's of 151m/1000 m for the 8x and 136m/1000 m for the 10x.
Close focus of the Lynxes is shorter with 1,3 m for both the 8x and the 10x.
So my hypothesis is (for what it is worth) that Maven has used the Kite Lynx bodies, with more metal parts and the optics of the Monarchs.
A puzzle remains the very high transmission values listed for the Mavens on the Maven WEB-site, which are hard to believe even in 30 mm binoculars with SP prisms in a much higher price range, but further research may enlighten us.
Gijs
They all have to be similar. Perhaps they are closer to the Kite's.
 
The Vixen New Foresta HR 8x32 WP's have a peak transmission of around 92% in the allbinos.com test results, and they don't cost anywhere near $500. Is 95% peak transmission not believable?
 
My apologies for the time frame involved in writing this. As I get older I want more time with a product before posting my thoughts. It gives me a better feel for the product overall. I don’t have a problem sharing initial impressions but it is the follow-up posts/threads that really help to define my overall impression of the product. (Plus this past weekend was a big birding weekend in terms of migration in my area and I really didn’t want to sit down and write the review when I had a chance to actually be out there using the binocular ;) ).

I like to add variety to my reviews so let me start off this one by saying that I really like this binocular. The Maven B3 8x30 checks off all the boxes for what I find appealing in a binocular. The optics, ergonomics and mechanics are all very good and I would have a difficult time believing that folks would find fault with them when it is considered as a “stand alone” product. Why do I say that? Well, when you ask most demanding optics users they will probably run through a checklist of items that they want in a binocular. If I had to take a stab at that list then it would probably look something like this….

- Optically bright, sharp, wide field of view, good neutral color, low levels of color fringing.

- Ergonomically easy to use and comfortable not only in the hand but also up against your face.

- Mechanically sound – focus wheel is smooth with no slop and very precise. Not too fast or too slow in rotation. Not too stiff or too loose in tension. Eyecups have to stay in place and so does the central hinge.

- Good accessories that are useful and actually fit the product.

- Reliable and thorough warranty and service from the company



Well, the Mavens check off all of those boxes. Lets break it down by section and get into more detail with each of these areas

Optical Performance


Lets cut right to the chase. I mean really who cares if the binocular fits like a glove in your hand if the optical performance doesn’t wow you? Who cares if the company will replace your binocular free of charge if you damage it unless you like putting it up to your eyes? Thankfully you don’t have to compromise when it comes to the B3 8x30.

Optically the Maven has a great deal going for it. Please keep in mind that my comments are general in nature and not specifically geared towards the fact that it is an 8x30 configuration unless otherwise noted. For one it is bright…even for an 8x30. I am referencing apparent brightness here which is often a combination of a variety of factors. It can be influenced by things such as color representation, color saturation, field of view, sweet spot size, eye relief, etc… We are talking about the apparent brightness here not just the light transmission level. If you could you contrive of some way that a person could look through the binocular without handling it then I have a hard time believing they would be able to differentiate this from several very good larger diameter binoculars in almost any light condition. Sure the smaller exit pupil would be notice in terms of eye placement but other than that one issue I think it would be a difficult call.

Second the apparent sharpness is excellent. In either viewing objects at close focus or several miles away I have never felt as if the binocular was lacking in terms of resolving ability. Everything seems very sharply defined. As with the case of apparent brightness it can be difficult to separate sharpness into its own category since it relies on other optical characteristics, such as contrast, to generate a specific impression. I have yet run into a situation with this binocular where I felt like I wanted better apparent sharpness.

Third, the color representation of this binocular seems entirely neutral to my eyes. I have compared with several other binoculars in my collection that either display warm or cold color biases. In comparison to them the B3 seems entirely neutral. If pressed, and under certain circumstances, I might say that the image comes off ever so slightly warm but that isn’t the impression I receive during regular usage.

Fourth, contrast and color saturation are very good but not what I would call excellent. It is definitely above average in this area but colors don’t necessarily pop as much as binocular that utilizes coatings to accentuate certain ranges of the color spectrum. Don’t misunderstand me, there hasn’t been a time where I didn’t see the beautiful blue associated with an Eastern Bluebird or the scarlet red associated with a Northern Cardinal. The colors look very good through this binocular but not necessarily heavily saturated.

Fifth, chromatic aberration control and sweet spot size are interrelated in my opinion. My estimation as to the apparent sweet spot size of this unit is approximately 75%. Keep in mind a couple of things as you read that. For one the field of view is very large, even for an 8x30-something binocular. At 8.2 degrees or 430 feet it is well above average. It wasn’t that long ago that all but the most expensive 8x30-somethings had average fields of view in the 7.5 degree (393 feet) range. Then the average shifted a little higher to where many of them approach the 8 degree (420 feet) mark. The Maven and only one or two other roof prism models now exceed that number. When you consider the price point that the Mavens sell at I think it is a difficult characteristic to ignore. So, 75% of an 8.2 degree field of view is very large in my opinion.

In addition, the transition from the sweet spot to the edge of the field is very gradual and appears to be entirely field curvature. I say the latter simply because with a very slight bump of the focus knob the edge of the field of view resolves itself into a sharp focus. The transition area between the sweet spot and that outside edge also gradually resolves into focus as you slowly turn the knob. The benefit to this, especially if your eyes have a good level of accommodation, is that the sweet spot can appear to be even larger than it is depending on the circumstances.

I mentioned color fringing in reference to this simply because the two are often interrelated. Such is the case with this model. Inside the sweet spot chromatic aberration is lacking. The image appears very “washed” and “cleaned” as a result. In this area it reminds me very much of the Zeiss FL and the Zen Ray ED series. Outside of the sweet spot in the transition zone all the way out to the very edge the level of lateral chromatic aberration increases. At no point do I find it objectionable though and only notice it when looking for it under extreme conditions.

Ergonomics

I enjoy the feel of this binocular in my hands. It has the newer “open bridge” style of central hinge where there is only a single hinge but it is extremely short in nature and situated close to the ocular section of the binocular. My index finger comfortably rests on the focusing knob while my middle finger sits on the central hinge and both my ring finger and pinky wrap very comfortably around the objective barrel.

I find the texture of the rubber armor to be very enjoyable as well. It has the “grippy” tactile sensation to it. When you couple this with a focusing knob that has a metal, checkered surface to it I have a difficult time believing the binocular could slip from your hands in any way. It just feels pleasant to hold. Keep in mind the physical weight of this binocular is listed only at 16.25 ounces. That certainly can add to the comfort level not only in your hand but also when hanging from your neck.

The ocular width of this binocular is large in comparison to the diameter of the eyecup. Translated that means that the eyecup width is fairly narrow in relation to entire diameter of the eyepiece. As a result the binocular passes nicely past my high-ridged nose and comfortably inside my eye sockets. With this position I experience no blackouts with the eyecup extended out to the first notched setting. With the eyecups fully collapsed I have to be more critical of eye positioning as the eye relief appears fairly good with this model.

Mechanics

After using this binocular daily for almost two weeks now I haven’t really found any mechanical concerns. As mentioned above the focus knob is smooth and exceptionally precise in feel. The 8x30 goes from a close focus a little over 5.5 feet out to a mountain a mile away in exactly one clockwise rotation of the focusing knob. That may seem “fast” to many individuals but the tension on the focusing knob controls the rotation to an extent that the focus doesn’t seem fast to my eyes. There is an extra quarter rotation beyond infinity focus with this unit.

The eyecups do twist out from fully collapsed to fully extended. There are several intermediate positions that the eyecups fall into as you rotate them outwards.

Accessories

I don’t have the accessories here with me at the moment so I will have to add onto this section at a later time.

Nitpicks

I have a few but nothing drastic. For one, the central hinge tension needs to be tighter for my personal preferences. I rarely share binoculars while out birding. If I do take someone with me then they either have their own or I give them one of my “loaner pairs” to use. As a result of this I want the central hinge tension to be tighter rather than looser. The B3 that I have in my position has central hinge tension that is a bit too loose. I haven’t accidentally knocked off the IPD in regular use but in removing the binocular from around my neck the neckstrap can get caught in my hood to the point that the IPD moves and I have to reposition it before the next use. This has only been a minor annoyance and one that is easily remedied on the manufacturer’s end.

Second, though I haven’t run into an issue with the eyecups moving from there set position there is some play when they fall into any of the intermediate positions between fully collapsed and fully extended. Again, I would assume this is fairly easily remedied in future production runs of this model.

Lastly, though I have no personal objections about having the binocular case as an optional item since I rarely put any of my binoculars in a case I think this is certainly an objection for some. A case, to my knowledge, has always been a regular part of any binoculars’ accessory package and shouldn’t be something that can be purchased separately.

All for now. Let me know if you have any questions.
 
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Frank,

An excellent review as always.

I realise you don't have an M7 to hand, but do you have an opinion if there are differences in field curvature or pincushion from what you recall?

Thanks,

David
 
David,

I made an effort in writing the review to leave out any comparison comments initially. After seeing what happened to the other B3 thread I thought it better to represent the product "on its own" without direct comparison to any other product.

Now, having said that I do intend to add further comments (and pictures) comparing the performance of the Maven to several other binoculars I have on hand including my beloved Sightron (which it does better in several areas) and several other models.

As for the Monarch 7 specifically, I do feel it is a little unjustified for me to make the comparison simply by memory. If pressed to make general comments then I would say they are more alike than not. The field of the Maven seems a bit flatter than the Nikon from what I remember and am given the impression that CA control/color representation is a bit better in the Maven. Again though it is tough without having them side by side.

I do feel the need to mention that there wasn't any glare/untreated components with the Maven. Black entirely internally and I specifically looked for stray light issues with it and did not find anything objectionable.
 
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That's fine Frank, thanks. I understand it would be unusual for Kamakura to allow two identical binoculars to compete in the same geographic area and wondered if that might be a more obvious difference. Of course there may be other more subtle differences, or maybe the country of origin counts. Just curious.

David
 
There is no proof that the Maven B3 and the Nikon Monarch 7 are "identical" binoculars. Even if manufactured by the same company and even if manufactured in the same plant, they could be made to different specifications. That is a relatively easy thing for a major manufacturer to offer.

For example, it would be easy for them to use different coatings on the objectives, eyepiece, or prisms. They could use different glass. There are many electronics products manufactured in the same Asian plant which are not "identical." One of the major strengths of some of these manufacturers is the ability to build to different specifications.

One couldn't be sure if they are identical unless lab measurements confirmed it and/or the manufacturer would confirm that they are made to the same specs.
 
Tom Bombadil, post 134,
You are absolutely right and we can only guess from the specifications given for the different binoculars ( in identical bodies as it looks) what choices were made by the manufacturer/dealer.
Gijs
 
A couple of further thoughts.....

1. I feel as if I didn't say enough about the fit and finish of the binocular. I find it first rate in that there aren't any concerns with the rubber armoring or the edges of any connecting components. I could also not find any type of internal debris inside either or the barrels. In other words the quality control on this particular unit seems to be excellent. There is a great deal of attention to detail evident in the design...even down to the word "Maven" inscribed on the front of beveled edge of the focusing wheel.

2. With regard to Gijs and Tom's comments...I would agree. We have often seen similar binoculars "rebadged" under different company labels. However those binoculars can often have notably different optical performance parameters and quality control levels. The first binocular that immediately comes to mind as I type this is the Vixen Foresta/Kenko (I forget the model name)/Theron Optics Wapiti LT. They all have the same chasis and practically the same specs on paper. Having owned all three I can say that there certainly was a difference in optical performance and quality control. I thought the Vixen was the most impressive optically of the group with the Theron not too far behind. Expectedly the Vixen was the most expensive also. If they all used the same components then I would expect that the coatings utilized on each model had a great deal to do with the final level of optical performance.
 
Nice review Frank.(I have BSii because off you)and what about ER?M7 and Kite are a bit short.I m a glass wearer.
 
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tom,

I haven't measured it at this point but I can take a shot at it later. I say that first because I don't wear glasses or even contacts so it is difficult for me to specifically say "it should be good for eyeglass wearers".

Having said that I do feel the need to mention my specific eye relief requirements. Somewhat surprisingly I use all of my binoculars with the eyecups fully collapsed. I need to. I have a high bridged nose and relatively close set eyes. As a result I need a binocular with good eye relief especially if it has large diameter eyecups/oculars. The opposite though is also true. If a binocular has fairly narrower diameter eyecup/oculars then I can get away with a shorter level of eye relief as I can get oculars past the bridge of my nose and closer to my eyes.

For what it is worth I can actually use the Maven B3s with the eyecups extended to the first notch out from fully collapsed. If I use it fully collapsed then I have to be more careful of eye placement since I can easily induce blackouts. To me that speaks to a respectable level of eye relief.
 
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