10 x 50 Dienstglas rln gray model - Carl Zeiss Jena 1944 - Production number 100272
This model was produced by CZJ, It is marked in the war time code - rln. It is a service binocular.
The binocular is a little different from the model described above. It does not have a texture on the body. The paint color is dark gray, which is hardly ever applied on the military model 10x50. It is smooth and very elegant.
The first models of this binocular - rln, under about 85 000 serial numbers were painted black, and did not have coating on the lenses. Around 88 000 manufacture the color on the body and objective tubes was dark gray and on the top and the bottom plates and objective rings was painted black. It had coated optics, giving superior performance against uncoated models.
The coating applied on the binocular lenses is internal. The eye and objective lenses are coated on the surfaces from inside of the binocular. The coating applied at that time was very soft. Applying a coating on the inner surfaces of the lens, prevented the destruction of the blooming. Other models had coating on external area and often it is seen as visible destruction on the blooming, caused by cleaning of the lenses.
Code rln markings was introduced around November 1944.
We are reading about this model in Dr Stephen Rohan book (page 116) - “A guide to Handheld Military Binoculars 1894-1945” : “ After a short battle American forces of the 80th Infantry Division, Third Army entering the Zeiss factory in Jena in April 1945 found many rln marked binoculars still there awaiting shipment. All of these binoculars were shared as “war trophies” by men of that liberating force”.
The rln gray model was produced in size 6x30 with coated lenses, monocular 6x30, and 7x50 gray model.
In our collection is rln 7x50 Gasmask binocular, but in black paint and coated.
Our binocular has a few accessories; a leather rain cover which is suspended on the binocular strap, in different way than some 7x50 blc model
(look page 3). Next equipment is a leather strap as to fixed the binocular to a tunic button on the uniform.
The binocular is marked with small +, it does meant that grease applied on the binoculars is able to protect it from damages to a temperature up to -40C. It is the same kind of grease, which was applied on the 10x50 blc model. This type of grease was applied to the binoculars from 1.11.1942. It was time when Germany invaded Russia. In the winter time the temperature in Russia, at that time was very low - it dropped to below -40C. It was essential to change the grease formula.
Pict 1, 2, 3; 10 x50 Dienstglas rln, gray model, in our collection; © Anna Vacani
The field of view in linear at a distance of 1000 meters is 128 miters. Diameter of exit pupil is 5 mm.
External Features
The binocular body is made of aluminium alloy with smooth gray paint.
On the right plate is engraved - Dienstglas (Service glass), magnification, production number, war time code of producer and kind of the grease used on the binocular, similar as on the plate on the 10x50 Dienstglas blc model.
Pict 4; the right prism cover with description; © Anna Vacani
The binocular has a dioptre scale on the ocular tubes, the oculars can be focused from -5 to +5 diopter. On the edge of the cover plates is a vertical mark for lining up on the dioptre scale. On most binoculars this mark is placed on the eyepiece main tube.
Pict 5; The dioptre scale; © Anna Vacani
This model was produced by CZJ, It is marked in the war time code - rln. It is a service binocular.
The binocular is a little different from the model described above. It does not have a texture on the body. The paint color is dark gray, which is hardly ever applied on the military model 10x50. It is smooth and very elegant.
The first models of this binocular - rln, under about 85 000 serial numbers were painted black, and did not have coating on the lenses. Around 88 000 manufacture the color on the body and objective tubes was dark gray and on the top and the bottom plates and objective rings was painted black. It had coated optics, giving superior performance against uncoated models.
The coating applied on the binocular lenses is internal. The eye and objective lenses are coated on the surfaces from inside of the binocular. The coating applied at that time was very soft. Applying a coating on the inner surfaces of the lens, prevented the destruction of the blooming. Other models had coating on external area and often it is seen as visible destruction on the blooming, caused by cleaning of the lenses.
Code rln markings was introduced around November 1944.
We are reading about this model in Dr Stephen Rohan book (page 116) - “A guide to Handheld Military Binoculars 1894-1945” : “ After a short battle American forces of the 80th Infantry Division, Third Army entering the Zeiss factory in Jena in April 1945 found many rln marked binoculars still there awaiting shipment. All of these binoculars were shared as “war trophies” by men of that liberating force”.
The rln gray model was produced in size 6x30 with coated lenses, monocular 6x30, and 7x50 gray model.
In our collection is rln 7x50 Gasmask binocular, but in black paint and coated.
Our binocular has a few accessories; a leather rain cover which is suspended on the binocular strap, in different way than some 7x50 blc model
(look page 3). Next equipment is a leather strap as to fixed the binocular to a tunic button on the uniform.
The binocular is marked with small +, it does meant that grease applied on the binoculars is able to protect it from damages to a temperature up to -40C. It is the same kind of grease, which was applied on the 10x50 blc model. This type of grease was applied to the binoculars from 1.11.1942. It was time when Germany invaded Russia. In the winter time the temperature in Russia, at that time was very low - it dropped to below -40C. It was essential to change the grease formula.
Pict 1, 2, 3; 10 x50 Dienstglas rln, gray model, in our collection; © Anna Vacani
The field of view in linear at a distance of 1000 meters is 128 miters. Diameter of exit pupil is 5 mm.
External Features
The binocular body is made of aluminium alloy with smooth gray paint.
On the right plate is engraved - Dienstglas (Service glass), magnification, production number, war time code of producer and kind of the grease used on the binocular, similar as on the plate on the 10x50 Dienstglas blc model.
Pict 4; the right prism cover with description; © Anna Vacani
The binocular has a dioptre scale on the ocular tubes, the oculars can be focused from -5 to +5 diopter. On the edge of the cover plates is a vertical mark for lining up on the dioptre scale. On most binoculars this mark is placed on the eyepiece main tube.
Pict 5; The dioptre scale; © Anna Vacani
It does not have an interocular distance scale on the hinge, and any other markings. The binocular is fitted with the original strap, rain cover and tunic button fixing leather strap.
Internal Features
The binocular is Porro I optical construction; the eyepiece contains 4 elements, the objectives contains two cemented elements.
The lenses are coated in our model. A reticule is not fitted in our model.
Pict 6, 7; The objectives and oculars coated; © Anna Vacani
The binocular dimensions
The binocular - weight 1006 grams (2,37 lb). Height - 170 mm (6,69 in) Width over the prism house (fully extended) - 180 mm (7,08 in), underneath of the objectives - 200 mm (7,87 in). The measurements are exactly the same as above model 10x50 blc.
Other Information
The binocular is in exceptional condition. Probably it was not issued to the army. The binocular is in the leather case, marked Carl Zeiss Jena.
Internal Features
The binocular is Porro I optical construction; the eyepiece contains 4 elements, the objectives contains two cemented elements.
The lenses are coated in our model. A reticule is not fitted in our model.
Pict 6, 7; The objectives and oculars coated; © Anna Vacani
The binocular dimensions
The binocular - weight 1006 grams (2,37 lb). Height - 170 mm (6,69 in) Width over the prism house (fully extended) - 180 mm (7,08 in), underneath of the objectives - 200 mm (7,87 in). The measurements are exactly the same as above model 10x50 blc.
Other Information
The binocular is in exceptional condition. Probably it was not issued to the army. The binocular is in the leather case, marked Carl Zeiss Jena.
Pict 8; The 10x50 Dienstglas rln with the CZJ case; © Anna Vacani
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?
Dienstglas 6x30 Ddx Serial Numbers Free
The magnification number on binoculars is expressed as part of a combination of two figures, for example 8x40 or 10x25.
Manufacturered by Voigtlaender and Sohn, Braunschweig, the right hand ocular is impressed with the designation Dienstglas 6×30 with serial number 239283, the maker code ddx and cold weather lubricant triangle. The individual focus adjustments still functions. The lens bodies and end pieces retain most of their painted, black finish. Dec 10, 2017 Wonder if all the prewar and early war Pol.Dienstglas (6x30, 10x50 roof prism) had a separate division of serial numbers. Just before and in the early wartime, we find besides the brass 6x30 porros the old 10x50 roof prism design with its long objective tubes up to numbers.
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.
Dienstglas 7x50
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.
The norton reader 13th edition pdf. 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