Dienstglas nrs. Database Postby Xavier » 05 Dec 2003, 21:21 last updated may 18, 2006 Well, now it is a very long range project, please send me by Private mail all data on your Dienstglas 6x30, 7x50 and 10x50 model binoculars, plus serial number and maker, I am attempting to create a database. Mkd also 'Pol dienstglas' under serial number on hinge button (not on barrel. May 18, 2006 please send me by Private mail all data on your Dienstglas 6x30, 7x50 and 10x50 model binoculars, plus serial number and maker, I am attempting to create a database Only will be accepted models with the word dienstglas stamped and number, could be maker. DDX KF Dienstglass 6x30 serial number i'm guessing this the right number 87904 it also has a marking of h/6400 any clue what that is? They were given to me as a gift from a british col. Don't know were he got them. Funny part is KF is for the cold and he was in africa during the war.
THE MAKER DDX IS 'VOIGHTLANDER & SOHN-BRAUNSCHWEIG' WITH THE SERIAL #0248238. THE BINOCULARS FOCAL LENGTH IS 6X30 AND ARE IN GOOD CONDITION. Welcome to the New Lot Closing Notification FeatureSubscribing to the Lot Closing Notification for an item will trigger our system to notify you about 5-10 minutes before the bidding closes.
1
Before buying a pair of binoculars for hunting or birding or for astronomy, it is crucial to understand what do the numbers on binoculars mean. These numbers provide you with a wide range of information about the binoculars, all of which will help you to buy a pair that is right for you. Let's look at these numbers in more detail.
1. What do the Magnification Numbers on Binoculars Mean?
The magnification number on binoculars is expressed as part of a combination of two figures, for example 8x40 or 10x25.
The first figure (8x, 10x) refers to the power of magnification. Binoculars with an 8x magnification will make objects appear 8 times closer than they are. The higher the number, the closer objects will appear through the lenses.
Extreme magnifications (12x and up) make it difficult to maintain a steady image, unless you have the binoculars stabilized on a solid object like a table or a wall. You also get zoom binoculars, which offer an adjustable magnification range.
2. Objective Lens Size (Aperture)
The number following the magnification power is called the objective lens size, also referred to as aperture. This is a critical number, because it indicates how much light the lenses are able to gather. A 10x50 binocular will have a 50mm objective lens size, a 7x35 will have a 35mm objective lens size, etc. Wider lenses usually also increase the size of the binoculars.
The wider the objective lens size, the brighter the image you'll see thanks to more light being gathered through the lens. This number is most important for night sky viewing, or other low light conditions.
Here's a simple question to demonstrate this: which of a 10x25 or a 10x50 binocular will be best for viewing the night sky? The answer is, of course, the 10x50. You'll see many more distant objects in the night sky thanks to the wider aperture.
3. Understanding Angle of View
Angle of view walks hand in hand with field of view as they refer to the same thing: the amount of horizontal scenery that is visible when looking through the binoculars.
We will discuss them separately to avoid confusion, and show you how to convert one to the other if needed.
First, angle of view (AoV):
AoV is always expressed in degrees. The higher the number, the wider the area you'll be able to see. Anything over 6 degrees can be considered a good angle of view.
If you see a really high degree number, like 72 degrees, the manufacturer may be using actual angle of view. This number is reached simply by multiplying the angle of view with the magnification value of the binoculars.
For example: a 10x50 binocular with a 7.2 degree angle of view will have a 72 degree actual angle of view (7.2 x 10 magnification).
4. Understanding Field of View
Field of view (FoV) is not expressed in degrees, but in either:
Again, a higher number simply means you'll have a wider horizontal view through the lenses. Typically you can consider a FoV of about 300 to 375 feet as adequate. Remember though that the higher your magnification, the smaller your field of view will be due to the object being brought closer.
Finally, here's how you convert angle of view to field of view:
Multiply the angle of view by 52.5
So, a 7.2 degree angle of view equals a 378 feet field of view
7.2 x 52.5 = 378
7.2 x 52.5 = 378
5. Eye Relief Number
The eye relief number on binoculars is mostly important only if you wear glasses. It tells you how far away from the eyepiece your eyes can be while still being able to enjoy the full field of view that the binoculars offer.
If you wear glasses, you'd want an eye relief of at least 15mm.
6. Exit Pupil Number
The easiest way to understand this number is to hold a pair of binoculars about 8 inches from your eyes. The two dots you'll see in the center of the eyepieces are where the light from the lenses hits your eyes to allow you to see the image you're focusing on.
These need to be greater than your pupils. The value is easily calculated by dividing the objective lens diameter with the magnification. A 10x50 binocular will have a 5mm exit pupil, while an 8x25 will only have a 3.1mm exit pupil.
Anything larger than a 4mm exit pupil should be fine for most conditions, but bigger is better.
7. Close Focus
Our final entry in this article about what do binocular numbers mean is close focus. This number tells you the minimum distance the binoculars need to focus. For example, a close focus of 13 feet means you can get a perfect focus on an object as close as 13 feet to you.
A Quick Checklist
Now you no longer have to be daunted by the question of what do the numbers mean on binoculars. Let's give you a quick checklist to help you remember the most important points:
- for night sky or low light viewing, a high objective lens diameter is important
- greater magnification means a smaller field of view
- look for an eye relief of more than 15mm if you wear glasses
- an exit pupil of more than 4mm is recommended for night viewing
- pay attention to a short close focus if you want to magnify very close objects
Conclusion
What does the numbers mean on binoculars? You now know the meaning of all the most important ones. Keep this guide handy when you shopping for binoculars to find the one that's right for you.
Get a nice big aperture if you want to see as many stars as possible, and a smaller aperture if lighter weight and portability are important to you. Beware of magnifications higher than 12x if you don't want too shaky an image without support, while also maintaining a decent field of view.
You'll be able to figure out all these considerations for yourself with the help of this guide. Good luck on buying the perfect pair of binoculars for your needs!
Furthur Reading: How to Choose Your Perfect Binoculars, Binocular Parts & their function
During the war the German army issued binoculars to some of their troops with specialised functions. The Gruppenführer or group leader would have one for instance. These binoculars or Doppelfernrohr where expensive and strictly army property. These where therefor engraved with Dienstglas noting the army property. The most common type is the 6×30 strength Dienstglas. 6×30 designates the capacity of the binoculars. The first number (6) refers to the magnification and the second number (30) indicates the diameter of the objective lens (the light-gathering lens) in millimeters.These binoculars where made out of different materials such as Aluminium, Zinc and Bakelite. The metal ones where first furnished with a leather or pressed paper wrap and later in the war in different finishes such as Anodization, Paint or Bluing. Later in the war binoculars where also finished in tan or Sandgelb paint. The binoculars have two adjustable eyepieces or Okulare with bakelite or aluminium end pieces. The right eyepiece features a reticle or Strichplatte in scale 6400 which is used to calculate distances. I will further discuss the use of this in another article that will be linked here.
The binoculars are featured with 4 accessories:
1 Trageriemen, a narrow leather string attached with two metal studs. Sometimes these straps are adjustable with multiple stud holes but most of the time they are not.
1 Okularschutz, a leather, bakelite or rubber eye shield cover to keep dirt out of the lenses. It is attached to the straps and often referred to as a rain shield.
1 Knopflasche, a leather or presstoff piece of material meant to strap the binoculars to a button on the tunic. It is fastened with one or two metal studs.
1 Behalter, a leather, bakelite or Presstoff case to protect the binoculars in transit. This case has a loop on the back to be carried on the equipment belt and a strap to be slung over the shoulder.
1 Trageriemen, a narrow leather string attached with two metal studs. Sometimes these straps are adjustable with multiple stud holes but most of the time they are not.
1 Okularschutz, a leather, bakelite or rubber eye shield cover to keep dirt out of the lenses. It is attached to the straps and often referred to as a rain shield.
1 Knopflasche, a leather or presstoff piece of material meant to strap the binoculars to a button on the tunic. It is fastened with one or two metal studs.
1 Behalter, a leather, bakelite or Presstoff case to protect the binoculars in transit. This case has a loop on the back to be carried on the equipment belt and a strap to be slung over the shoulder.
Markings: Dienstglas – 6 x 30 – 170925 – B – ddx
Maker: ddx refers to the maker Voigtlaender u. Sohn AG, Braunschweig.
Year: –
Serial: 170925
Material: Aluminium
Furnished: Artificial leather
Finish: Anodized aluminium
Strap: unadjustable strap with anodized aluminium studs
Rain cover: Bakelite with stitched leather attachment.
Notes:
Case material: Black bakelite
Case straps material: Leather
Case straps marking: –
Notes:
Maker: ddx refers to the maker Voigtlaender u. Sohn AG, Braunschweig.
Year: –
Serial: 170925
Material: Aluminium
Furnished: Artificial leather
Finish: Anodized aluminium
Strap: unadjustable strap with anodized aluminium studs
Rain cover: Bakelite with stitched leather attachment.
Notes:
Case material: Black bakelite
Case straps material: Leather
Case straps marking: –
Notes: