Documents Tagged with "Binocular"

Q: What do the numbers mean?A: Binoculars are defined by magnification (x) and objective lens diameter (in mm).For example: 8X43 8X = magnification (8 times life size) 43 = diameter of the objective lens in mm Another designation on binoculars is (angular) Field of View (FOV) which is defined in degrees.

Q: What is interpupillary distance?A: This is the distance from the center of the pupil of one eye to the center of the pupil of the other eye.Properly adjusted, one single image circle is formed from two separate images.Interpupillary adjustment is made with the “hinge” of the binocular.While looking through your binocular, simply grasp both barrels and adjust the hinge as required to move barrels closer together or further apart, in order form a single "converged" image.

Q: I’m seeing double images, what’s wrong?A: Double images may indicate that one or both prisms are out of alignment or “collimation”.Even though barrels can be focused, the user cannot make any adjustments to converge images.This can occur as the result of a shock to the binocular and requires a technician’s inspection.

Q: How do I set up my binocular for viewing?A: Both binocular barrels must be individually adjusted to sharply focus for each eye (focus-aligned).Because vision correction is usually somewhat different from person to person (and from one eye to the other), each different user must adjust focus alignment for their particular vision.

Q: What is eye relief?A: When your eye is correctly distanced from the eyepiece, the entire field of view should be comfortably visible.This minimum distance from the eye to the eyepiece (at which the entire field of view is visible) is your eye relief.Long eye relief (15mm or longer) permits a comfortable distance from the eye to the eyepiece and even for glasses to be worn while viewing through the eyepiece.

Q: What is the exit pupil?A: This is the diameter of the column of light that exits the eyepiece and enters the eye.The larger the diameter of the exit pupil; the more light enters the eye.In bright viewing conditions, the pupil of your eye will constrict and a small exit pupil diameter is generally adequate.

Q: What are the eyecups and how do I use them?A: Eyecups are the extendable rubber or plastic tubes (or shields) that surround the eyepieces of your binocular.They are used to set eye relief.For those who do not wear eyeglasses, simply back out (extend) the eyecups until the full field of view is visible in both barrels.

Q: How do I clean my lenses?A: We may recommend using any suitable camera lens cleaning materials (available at most photo shops).Some sport optics dealers may offer lens cleaning materials with anti-fogging properties, which may also be suggested.For the best results, follow packaged recommendations, and carefully clean lenses as soon as possible when required.

Q: Can I mount my binocular to a tripod?A: Yes.Mounting your binocular to a tripod provides greater stability and can improve viewing comfort.Most PENTAX binoculars feature a standard ¼”-20 thread for attaching a tripod adapter.PENTAX also produces tripod adapters for our binoculars.The higher the magnification, the more difficult it is to hand-hold a binocular steadily.

Q: What determines the brightness of a binocular?A: Brightness is strictly determined by objective lens diameter and magnification.As a rule: as magnification increases - brightness decreases, and larger objective lenses gather more light than smaller objectives.Brightness is also affected by exit pupil size, lens and prism quality, and optical coatings.

Q: What is relative brightness?A: Relative brightness is a term which defines comparative brightness of various binoculars.It is simply calculated as: exit pupil squared For example: the higher this number - the brighter the binocular.It is important to remember that the greater the magnification of a binocular, the lower the relative brightness.

Q: Which binocular is best for me?A: When selecting a binocular, it is important that the product meets your needs.The user must first determine which application is of foremost importance when selecting a new binocular.As well; cost, design, magnification, brightness, size and weight, and environmental use are all determining factors in which model to choose.

Q: What do the letters on my binocular signify?A: Not all PENTAX binocular models are designated by letters that define a specific acronym or “meaning”.Some letters are merely used to denote a specific model.However, the following are definitions of specific acronyms used by PENTAX for certain binoculars:

Q: What prisms are used in PENTAX binoculars? A: All PENTAX binoculars feature BaK4 prisms.This premium optical prism refracts more light than other prism types; resulting in sharper, brighter images.

Q: Does PENTAX produce large-aperture binoculars for specifically for astronomy?A: No.However, any of our binoculars with objective lenses of 40mm or larger may be recommended for astronomical observing.PENTAX binoculars feature outstanding optical performance and will provide stunning views for astronomical use.

Q: Does PENTAX produce filters for binoculars?A: No.PENTAX PentaBright® technology delivers outstanding performance without the need for additional filtration.

Q: Does PENTAX produce a binocular with a built-in camera?A: No.PENTAX has not announced plans to produce such a product.

Q: Does PENTAX produce a night-vision binocular?A: No.PENTAX has not announced plans to produce such a product.

Q: Does PENTAX produce a binocular with a built-in compass?A: Yes.PENTAX produces the 7X50 PENTAX MARINE binocular.This model not only features a built-in compass, but a ranging reticle - for calculating distance from a known object, and the size of an object from a known distance.

Q: Does PENTAX produce a binocular with image stabilization?A: No.PENTAX has not announced plans to produce such a product.