• BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

    Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

New MeoStar B1 Plus Binoculars (1 Viewer)

Gijs van Ginkel

Well-known member
Leen, post 40,
The optimum sensitivity of the cones (night vision) is located at 500 nm according to different research reports, that is why I mention 500 nm in my tables, but with a little effort you can read the transmission values from the curves at 480 nm and since one can do nothing else in these corona times it is a nice excercise.
Gijs van Ginkel
 

John A Roberts

Well-known member
Australia
Hi JG,

Well colour me slightly pink!

I was intentionally cautious as there's both an 8x32 and 10x32, and as far as I know the only external difference is the marking on the focuser

However, the first image is of a x42 model - not a x32 one! And since only the 10x42 has HD glass,
the ‘star’ marking on the badge on the side of the binocular presumedly indicates it’s the 8x42 version

For a clear idea of the different proportions of the x32 and x42 models, see the two images. The first from a 2016 catalogue and the second from a 2018 one
It’s what I should have checked before posting


John
 

Attachments

  • B1 series.jpg
    B1 series.jpg
    70.4 KB · Views: 146
  • 2018 cat.jpg
    2018 cat.jpg
    132.4 KB · Views: 142
Last edited:

Bananafishbones

Incoherently Rambling .....
so guys
I had a play with the B1.1 10*42HD at the birdfair. A little out of my price range at the moment.

For £400-500 less I could probably pick up the B1. Optically what am I missing going with the older version.... I am very tempted

Thanks for any input

Dave
 

jgraider

Well-known member
No problem John. I certainly wasn't calling you out, but was wondering if Meopta did a reconfig on that 8x32, that's all. I appreciate your information, as usual.
 

Troubador

Moderator
Staff member
Supporter
so guys
I had a play with the B1.1 10*42HD at the birdfair. A little out of my price range at the moment.

For £400-500 less I could probably pick up the B1. Optically what am I missing going with the older version.... I am very tempted

Thanks for any input

Dave

B1.1 is not quite a facelift as it has a 'lift-up, set, and lock' dioptre adjuster, whereas the older B1 just has a rotating knob that moves in set amounts and has a tapering diameter so is hard to move accidentally. The B1.1 is therefore a minor update. B1 Plus is a facelift of B1.1 with new armour.

Lee
 

pbjosh

missing the neotropics
Switzerland
The naming conventions and minor upgrades are certainly confusing to those that are not Meopta cognoscente! Is it known for certain that shy of potential coatings changes nothing has changed in the optical train in any of the models from B1 to B1.1 to B1 Plus?
 

John A Roberts

Well-known member
Australia
Hi JG (#46),

No offence taken, as I certainly didn’t take that as your intention. I was amused that I thought that I’d been careful in post #39, but as it turned out
. . . not careful enough! (as is many things, it's often that dastardly detail that trips a person up)


John
 

John A Roberts

Well-known member
Australia
For pragmatic reasons optics manufacturers like to share components within product lines. As I previously indicated:
. . .
As in many other industries, inventory management is a huge concern for optics manufacturers
In Swarovski Optik’s 70th Anniversary video it’s stated that they manufacture around 9,500 different parts for their product range,
see here: https://www.birdforum.net/showthread.php?t=375640
And presumedly they also order in a huge range of additional parts:
- both standard pattern items like screws and washers
- along with specialised items such as rubber armour mouldings
So even with computerised inventory management and Just In Time supply practices, their on-hand inventory at any time must be enormous

Consequently, when a company designs something like a series of binoculars . . . it tries to use as many common parts as possible

And that's the approach taken by Meopta with the B1 line, especially with the x42 and larger models

Looking at both the images in post #43, along with the specifications (see a copy from the 2019 US catalogue that also handily includes transmission data),
it’s clear that:
a) the x32 models use a smaller body and focuser, along with smaller eyepiece and objective assemblies, while
b) the x42, x50 and x56 models all share a common body, and vary the eyepiece and objective assemblies
(the attached cutaways show how the seperate objective and eyepiece units are attached to the main body)


In terms of specific details of the internal construction, there are only two images that I’m aware of:
• an unspecified x42 model (most probably the 8x42?; the image dates back to 2005, when the B1 line was introduced), and
• the 10x42 HD model (in 2013 the 10x42 was upgraded by the use of HD glass for one of the lenses in the objective group; the image is from the 2019 US catalogue)


A) Objectives
Both cutaway x42 images show an uncommon objective arrangement. It consists of a conventional achromatic doublet along with a single lens focuser *
However, a 4th lens is fixed immediately in front of the first prism. Presumedly this contributes to the short length of the x42 series
i.e. it allows a shorter then usual physical length for a given focal length

However, it does not seem that this arrangement is necessarily used on all of the larger models (or perhaps even on the x32 ones)
Roger Vine noted when using a laser pointer to illuminate the inside of the objective housings of the 7x50 and 12x50 HD,
that both appear to have ‘ . . . cemented doublets with doublet focusing lenses behind.’ See his review of each at: http://www.scopeviews.co.uk/BinoReviews.htm
So while these x50 models also use four lenses, it's not in the same configuration as the x42’s

* in addition, while the earlier image shows the achromat as a cemented pair, the achromat of the 10x42 HD seems to have an air gap between the lenses


B) Prisms
Notwithstanding comments to the contrary, all models including the x56 ones use Schmidt-Pechan prisms, see: https://www.birdforum.net/showpost.php?p=3960026&postcount=43

The x32 models necessarily use smaller prisms than the larger models. However, as all the larger models have a common body, it’s highly likely that they use the same prisms
That, along with the use of aluminium alloy for the housings (rather than magnesium), could explain why the x42 models are heavier than most of those from other manufacturers


C) Eyepieces
Looking at the information in the table, and using the expedient of multiplying magnification by Field Of View in degrees,
it can be seen that most models have a nominal AFOV of around 63 degrees
The obvious exceptions are the 7x50 at 55 degrees and the 8x56 at 51 degrees

The Eye Relief figures reinforce that various eyepiece configurations are used to alter the magnifications
And as can be seen:
- the earlier x42 image (the 8x42?) shows 4 lenses in 3 groups, in a 1/ 2/ 1 configuration, while
- the 10x42 HD has 5 lenses in 3 groups, in a 2/ 2/ 1 configuration

And finally, as noted by Roger Vine the two x50 models that he tested had different diameter eye lenses


John
 

Attachments

  • US 2019.jpg
    US 2019.jpg
    268 KB · Views: 79
  • x42 from 2005  .jpg
    x42 from 2005 .jpg
    109.8 KB · Views: 85
  • US 2019 cat.jpg
    US 2019 cat.jpg
    226.2 KB · Views: 78
Last edited:

jgraider

Well-known member
Interesting interview. I am a big Meopta fan, but what baffles me even more after reading this interview is that the new Meopro air was stated to bridge the gap between the Meopro and Meostar, but it is reported that the Air will have Meostar glass. Something doesn't add up in this equation in my feeble brain.
 

Troubador

Moderator
Staff member
Supporter
Interesting interview. I am a big Meopta fan, but what baffles me even more after reading this interview is that the new Meopro air was stated to bridge the gap between the Meopro and Meostar, but it is reported that the Air will have Meostar glass. Something doesn't add up in this equation in my feeble brain.

Hi JG

One solution to your brain pain might be that the report was if not mistaken then perhaps confusing. I think it comes from this quote from a post in January: "They all said the glass was on a MeoStar level instead of MeoPro".

I think in this case 'glass' means the Air binos (not the stuff the lenses are made from) and they are simply saying they thought the performance of the Air was closer to MeoStar than MeoPro.

Maybe they are right because in the interview Milos says "So I think B1 Plus demand will naturally fade down after launching B2 and MeoPro Air". It seems to me that MeoPro Air is stepping on the toes of the current B1.1 Plus MeoStar because this is going to fade and be replaced by B2 which will be a step up in performance, and the position of B1.1 Plus in the range will have been replaced by Air. The spanner in the works has been Coronavirus which appears to have got in the way of B2 being launched this year.

Lee
 
Last edited:

jgraider

Well-known member
Not arguing with you Lee, but reporters from the SHOT show earlier this year reported "glass is the SAME in the Meopro and Meostar". Doug at CameralandNY is one who reported the same thing.
 

pbjosh

missing the neotropics
Switzerland
I kind of have to agree with Andy. I don’t mean to sound overly critical, and I fully admit that I am not nearly as up on Meopta binoculars as some people. It took me a while to remember if Pro or Star was “better” - the products were reasonably clear but which name is the name of the top product? Now B1 followed by B1.1 followed by B1 Plus but to be replaced by the pro air which isn’t a pro but just an air is really messy. At least the B2 is a new product and clearly defined as a new top of the market offering.
 

Troubador

Moderator
Staff member
Supporter
Not arguing with you Lee, but reporters from the SHOT show earlier this year reported "glass is the SAME in the Meopro and Meostar". Doug at CameralandNY is one who reported the same thing.

No probs JG we are both just trying to figure out what is happening. And what appears to be happening is MeoPro Air is to take the place of B1/B1.1/B1 Plus and B2 will be top of the line but will not arrive this year as planned as Coronavirus has delayed it until 2021.

Lee
 
Last edited:

Users who are viewing this thread

Top