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Zeiss quality within everyone's reach
The Zeiss Terra ED Compact are compact, lightweight and waterproof binoculars. Weighing just 310 grams , they are the ideal companion for activities in the nature/outdoor segment.
Its large field of view offers detailed images with a high level of contrast , due to exceptional optical quality thanks to Schott ED glass.
Characteristics model 8x25
- Magnification: 8x
- Objective diameter: 25
- Exit pupil diameter: 3.1 mm
- Twilight factor: 14.1
- Field of view m/1000m: 125
- Minimum focus distance: 1.9
- Diopter adjustment range: +-3
- Lens type: ED
- Water tightness: 100mbar
- Dimensions: 9.5 x 11.1 cm
- Weight: 310g
Characteristics model 10x25
- Magnification: 10x
- Objective diameter: 25
- Exit pupil diameter: 2.5
- Twilight Factor: 15.8
- Field of view m/1000m: 97
- Minimum focus distance: 1.9
- Diopter adjustment range: +-3
- Lens type: ED
- Water impermeability: 100mba
- Weight: 310g
Guide to choosing your binoculars
Before buying binoculars, we must be aware of the use we are going to give them as well as the budget we will have available in the choice when determining the technical characteristics we will choose.
A. TYPES OF PRISMATICS
Depending on the internal structure of each binocular (objective lenses, eyepieces and prism system).
- Depending on the prism system, there are two types:
- Porro: with better depth perception and the most economical option.
- Roof: with a smaller and lighter body.
- According to the quality of the prisms:
- Organic: they are usually made of plastic and are of poor quality.
- Mineral: or glass, they are the best option and can be BAK-7, cheaper and lower quality borosilicate glass or BAK-4 of higher quality and with sharper images with barium glass.
- Depending on the lens treatment:
- Coated: Partial coating
- Fully Coated: Complete coating
- Multicoated: Multiple layers of coating
- Fully Multicoated: Several layers of full coating
- Magnification and aperture:
The magnification is determined by the first technical number of the binocular optics, and the aperture by the second number (e.g. 8x40). In general, amateur binoculars should have between 7 and 10x magnification. Likewise, the larger the aperture, the higher the resolution, so we will have to move in a range between 30mm and 50mm. - Brightness:
It should be between 3.5 and 6 to be considered normal or very good. - Field of view:
It is the width in meters of the area visible through the binoculars at a distance of 1000 meters. Always depending on the fact that the higher the magnification of the binoculars, the smaller the field of view. - Focusing:
It is usually done through a wheel or by means of a cam. The minimum focusing distance is very important because sometimes we also need to observe objects at a very short distance. It should therefore be at least 8 meters. - Eye Relief:
This refers to the distance that must be between the eyes and the binocular so that the pupil equals the exit vision. The greater the distance, the more comfortable it will be. - Mount:
It will mark the resistance of your binoculars to adverse weather conditions. Water resistant or waterproof (submersible) and highly resistant to shocks are desirable features in the mount.
It is very important before making the purchase decision, to know what we want to use our binoculars for, as it will depend on the characteristics that we will require for some occasions or others.
- Initiation or General Use: it is best to opt for bright 8x40 binoculars, with a wide field of view and comfortable size and weight.
- Ornithology: the 8x40 is still a very good option but if we want to see birds at long distances we will opt for higher magnifications over 10x.
- Night use: with a minimum of 50x magnification.
- Mountain: we want a light and compact binoculars in 8x30 or 7x30 models,
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