Maven 2XM Doubler Review: Is It Worth Carrying Instead of a Spotting Scope?
By Chris Bunce, Ignited by Nature
There are times when I want more magnification than my binoculars provide, but I don't necessarily want another full-size optic in my pack. The Maven 2XM Doubler is designed for exactly that situation. It attaches to a compatible Maven eyepiece with a dedicated adapter and doubles the magnification. My 18×56 Maven B.5 binoculars, for example, become a 36× monocular view through one barrel.
That sounds like a compact spotting scope replacement. After trying the doubler on binoculars and spotting scopes, I found that the answer depends heavily on which optic you're using and what you expect from the image. Here is where I think it earns a place in a pack, and where I would leave it behind.
How the Maven 2XM Doubler Works
The doubler is a small eyepiece that slips over a compatible Maven optic using a model-specific adapter. Thread the adapter onto the doubler, then fit the assembly to the eyepiece. It is an easy way to get additional reach without swapping to a separate spotting scope.
In my review, the doubler was $155 on its own, and an adapter added $30, bringing the combination to $185. Those were the prices when I recorded the video, so check current pricing and the exact adapter required for your optic before buying. Maven offers adapters for several binocular and spotting scope lines; the adapters I had on hand included versions for the B.5, S.2, and S.1 family.
Build Quality, Weight, and Packability
The doubler feels like a quality piece of equipment. Its twist-up eyecup moves smoothly and has distinct positions, and I found the eyepiece comfortable. The small size makes it easy to keep in a pack lid, hip-belt pocket, or jacket pocket.
On my scale, the doubler itself weighed 5.6 ounces. The B.5 adapter added about 0.5 ounce, for a total of approximately 6.1 ounces. The S.2 adapter brought the combination to 6.6 ounces, and the larger S.1-family adapter brought it to 6.9 ounces. My doubler, protective case, and digiscoping adapter together weighed 10.7 ounces.
Those numbers matter when the alternative is packing another optic. In the video, I compared the doubler with spotting scopes weighing several pounds. If I'm already carrying binoculars, the doubler gives me more magnification for a relatively small increase in weight and pack space.
Optical Performance: The Trade-Off for More Magnification
The added reach is real, but so are the compromises. With the doubler attached, the image looks darker, and the field of view gets much narrower. It can take more effort to locate an animal or other subject, especially at higher magnification. The resulting view also isn't as good as what I get from a dedicated spotting scope. Any optical flaws already visible through the host optic can become more apparent when magnified.
I had the best experience using it on my B.5 18×56 binoculars. At 36× through one eyepiece, I could still manage the field of view well enough to find what I wanted to inspect. The image was useful for spotting animals and taking a closer look, even though it wasn't as bright or as refined as a dedicated scope's view. I can see the same appeal for someone carrying 12× or 15× Maven binoculars who occasionally wants 24× or 30× without packing a spotter.
The experience was less compelling on spotting scopes. On the Maven S.2, I could use the doubler more comfortably when I started at the scope's lower magnification and found my subject first. Trying to find a target after adding the doubler and dialing up magnification was harder. On the Maven S1.2, the field of view became so tight that I would generally skip the doubler. That scope already gives me plenty of magnification for most of my use.
What I Like
Very little added weight: My B.5 setup weighed about 6.1 ounces with its adapter.
Less gear in the pack: It fits in a small pocket and can provide occasional extra reach when I already have binoculars along.
Useful with binoculars: The B.5 pairing was the strongest reason for me to carry it.
Flexible adapter system: One doubler can be paired with different compatible Maven optics when you have the right adapters.
What I Don't Like
A darker, narrower image: More magnification comes with a meaningful loss of brightness and field of view.
Harder target acquisition: This was especially noticeable when I used it on spotting scopes at higher magnification.
Lower image quality than a dedicated spotter: It helps me inspect a subject, but it doesn't give me the same overall viewing experience.
The cost adds up: At the price I quoted in the video, the doubler and one adapter cost $185. That is worth weighing against an entry-level spotting scope, depending on your priorities.
Would I Carry It in the Field?
If I were taking my 18×56 binoculars, wanted to save weight, and planned to leave the spotting scope at home, I would consider bringing the 2XM Doubler. It is a practical way to get a closer look without committing several more pounds of pack weight.
For my usual setup, I generally bring a spotting scope anyway. In that case, I prefer the spotter's easier viewing and better overall image, so the doubler probably stays home. I also wouldn't buy it primarily to extend an already powerful scope such as the S1.2. Its strongest use, in my experience, is giving Maven binocular owners occasional extra magnification.
Final Verdict
The Maven 2XM Doubler is a clever, well-made accessory with a clear purpose. On my B.5 binoculars, it gave me useful 36× reach in a setup weighing just over six ounces. The smaller field of view, dimmer image, and reduced image quality keep it from fully replacing a good spotting scope, but they may be reasonable trade-offs when weight and space matter most.
If you already own compatible Maven binoculars and only need high magnification occasionally, it is worth considering. If you glass at high power for long periods or care most about the best possible image, I would choose a dedicated spotting scope.
Watch my Maven 2XM Doubler field review.
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