PF-63 Zoom, 63mm straight body with non-removable 20-50x zoom

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The Pentax PF-63 Zoom is a lightweight and compact armored straight-through viewing 63mm spotting scope. Its rugged rubber-armored fiber-reinforced polycarbonate body is O-ring sealed and nitrogen-filled to be internally fogproof and waterproof to a depth of one meter.

The extra 3mm diameter of the scope’s 63mm objective lens yields 5% higher resolution and 10% greater light gathering than a conventional 60mm scope. Its sophisticated optical system uses a costly BaK-4 image-erecting prism for high light transmission, plus a 4-element 3-group objective lens and a non-removable 4-element 3-group zoom eyepiece for high resolution. All lens elements are fully multicoated for high light transmission and contrast.

Features that distinguish this scope from competitive scopes . . .

  • Exceptionally fast focusing. Only half a turn of the large ribbed rubber focusing knob located at the side of the scope moves from a close focus of 40 feet out to beyond the horizon and beyond. Despite its speed, the focusing is very precise, making it easy to follow birds in flight and other moving subjects. The large focusing knob is easy to use in cold or wet weather, even when wearing gloves.
  • The PF-63 Zoom is supplied with a non-removable 20x to 50x zoom eyepiece. This provides a view that ranges from a 1.6° field at 20x (84’ @ 1000 yards) to a 0.9° field (48’ @1000 yards) at 50x. The eyepiece, like the scope body, is specially sealed to be weatherproof under the worst observing conditions a birder might encounter.
    Rotating the power ring on the eyepiece changes the magnification from a low power/wide angle 20x, for glassing large areas, to a higher power 50x for observing details close up. Unlike many scopes, the Pentax zoom remains in focus as the magnification changes, limiting the amount of refocusing needed as you move from one end of the power range to the other.
    While specified at a very long 22mm to 17mm eye relief, the measured usable eye relief actually ranges from 15mm at 20x to 10mm at 50x. These values will somewhat vignette the field of view for those who must wear eyeglasses while observing due to astigmatism, particularly at the higher powers. Those who do not wear glasses will find the eye relief more than acceptable for unvignetted viewing, particularly when the roll-down rubber eyecup is extended to block out ambient light and position the eye at the correct eyepoint.
    As with any zoom eyepiece, the precise focal length or magnification of the Pentax zoom at any given point in time is not all that important. The experienced observer invariably adjusts the zoom magnification to match the seeing conditions and object size as he looks through the eyepiece, rather than first setting the zoom to an arbitrary focal length value according to the magnification scale on the side of the eyepiece and using it at that power no matter what the seeing conditions. The flexibility of a zoom to instantly match the magnification to changing lighting or seeing conditions is one of the zoom eyepiece’s chief advantages.
  • Other features of this scope . . .
  • All lens elements in both the objective lens and eyepiece are fully multicoated to maximize light transmission, clarity, and contrast.
  • The rugged and lightweight (less than two pound) fiber-reinforced polycarbonate body is nitrogen filled and O-ring sealed to be internally fogproof in all temperature extremes and waterproof to a depth of one meter. Nitrogen purging also prevents the internal formation of fungus in high humidity climates, such as rain forests.
  • Black rubber armor on the scope body provides shock-protection and a sure grip in wet weather.
  • Slip-on dust caps are provided for the eyepiece and the objective lens to protect the optics while they are being transported or stored.
  • The 63mm Pentax mounts on any photo tripod having a standard 1/4”-20 thread mounting bolt.
  • A sight line molded into the top of the prism housing aids in acquiring targets quickly. The straight-through viewing design of this scope lets you quickly locate birds in the field. You can switch from roughly locating birds using the sight line to observing them close up through the eyepiece with little more than a 1” move of your head.
  • The supplied nylon soft carrying case is lightly padded and has a zippered opening. Carrying handles are provided on the case, which is designed only for transport and storage and must be removed before using the scope.
  • This Pentax spotting scope is protected by the Pentax “Worry-Free” lifetime warranty that will repair or replace (at Pentax’s option) any defective product (even if damaged by you) for the life of the original owner for a cost of only $19.95 to cover shipping and handling.
  • Magnification:
    Magnification is the ability of a telescope to make a small, distant object large enough to examine in detail. If you look at the Moon (250,000 miles away) with a 125 power (125x) telescope, it's essentially the same as looking at it with your bare eyes from 2000 miles away (250,000 ÷ 125 = 2000). The same telescope used terrestrially will make an object one mile away appear to be only 42 feet away (5280 feet ÷ 125 = 42).
    The magnification of a telescope is determined by dividing the focal length of the telescope (usually in millimeters) by the focal length of the eyepiece used (again, usually in millimeters; but in all cases by the same unit of measurement used for the telescope focal length). For example, a 2000mm focal length telescope and a 10mm focal length eyepiece will give you a magnification of 200 power (2000 ÷ 10 = 200). The same 2000mm telescope with a 20mm eyepiece will give you 100x (2000 ÷ 20 = 100).
    Field of view 1000 yards:
    84' @ 20x; 48' @ 50x
    Near Focus:
    Eye Relief:
    Eye relief is the distance from the last surface of the eye lens of an eyepiece to the plane behind the eyepiece where all the light rays of the exit pupil come to a focus and the circular image is formed, sometimes called the “Ramsden Disk.” This is where your eye should be positioned to see the full field of view of the eyepiece. If you must wear glasses because of astigmatism, you’ll usually need at least 15mm of eye relief or longer if you want to see the full field of view with your glasses on.

    A note on our eye relief figures: Quite often, our eye relief figures will differ from those of the manufacturer. This is because we measure the “usable” eye relief, while the manufacturers specify their usually-longer (but technically correct) “designed” eye relief.

    The eye lens of the eyepiece is normally recessed below the rubber eyeguard or rubber rim of the eyepiece to keep the lens from being scratched during use. An eyepiece might have a “designed” eye relief of 15mm (and the eye relief will truly measure 15mm from the eye lens to where the image forms). However, if the eye lens is recessed 3mm below the eye guard, the Ramsden Disk forms only 12mm above the eyepiece body (the 15mm “designed” eye relief, less the 3mm of eye relief made unusable by having the eye lens recessed into the body of the eyepiece). This “usable” eye relief of 12mm (measured from the rolled-down eyeguard – the closest point you can get your eye to the eye lens – to where the image forms) is the eye relief figure we would measure and list in this website.

    Why is it important to list the “usable” eye relief? For those people who don’t wear eyeglasses while observing, a few mm difference between the eye relief they expect from the manufacturer’s literature and the shorter eye relief they actually get in real life doesn’t mean a lot. They can simply move a little closer to the eyepiece to see the full field, and never realize that the eye relief is a little shorter than they expected. However, some people must wear eyeglasses while observing, because of severe astigmatism. These observers can’t move closer to the eyepiece if the eye relief is shorter than expected because their glasses get in the way. For these people, the real life “usable” eye relief is more important than the technically correct but sometimes not fully usable “designed” eye relief. We measure and list the actual usable eye relief so that people in the real world can pick the eyepieces that will work best for them.

    15mm @ 20x, 10mm @ 50x
    Exit Pupil:
    The circular image or beam of light formed by the eyepiece of a telescope. To take full advantage of a scope's light-gathering capacity, the diameter of an eyepiece exit pupil should be no larger than the 7mm diameter of your eye's dark-adapted pupil, so that all of the light collected by the telescope enters your eye. (The eyepiece exit pupil diameter is found by dividing the eyepiece focal length by the telescope focal ratio.) Your eye's ability to dilate declines with increasing age (to a dark-adapted pupil of about 5mm by age 50 or so). For those in this age group, eyepieces with exit pupils larger than their eyes can dilate to simply waste their telescope's light-gathering capacity, as some of the scope's light will fall on their iris instead of entering their eye.
    3.15mm @ 20x
    Twilight Factor:
    A number used to compare the effectiveness of binoculars or spotting scopes used in low light. The twilight factor is found by multiplying the size of the objective lens (in mm) by the magnification and then finding the square root of that result. The larger the twilight factor, the more detail you can see in low light. A twilight factor of 17 or better if usually required for reasonable low light use.
    35.50 @ 20x
    This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
    A binocular or spotting scope whose body is clad in rubber or polyurethane armor is said to be armored. Armor can be applied for looks, a better grip, noise-proofing, etc. An armored body does not guarantee that a binocular or spotting scope is waterproof, although most waterproof optics are armored.
    The weight of this product.
    29.6 oz.
    "No-Fault" Limited Lifetime
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    Pentax - PF-63 Zoom, 63mm straight body with non-removable 20-50x zoom

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    Pentax - PF-63 Zoom, 63mm straight body with non-removable 20-50x zoomImage showing the scope with all supplied accessories. Note the oversized focus knob.
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    Our Product #: P63Z
    Manufacturer Product #: 70913
    Price: $329.00
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    MSRP: $439.00

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    The Pentax PF-63 zoom is designed to give you true Pentax-quality optical performance at a surprisingly affordable price . . .

    . . . our 36th year