PF-65ED-A II Zoom, 65mm ED II 45° angled body with 20-60x XF-series zoom

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The Pentax PF-65ED-A II Zoom is a lightweight and compact armored 45° angled viewing 65mm spotting scope equipped with a Pentax XF-series 20x to 60x zoom eyepiece. The scope is designed to give you Pentax-quality optical performance, but from a lighter and more manageable body than the larger 80mm Pentax scopes. It is O-ring sealed and nitrogen-filled to be fogproof and totally waterproof to a depth of one meter. Extra-low Dispersion (ED) glass elements in its 5-element 3-group objective yield optimum optical resolution.

Unlike other spotting scopes, which use proprietary bayonet-mount eyepiece holders that accept only the scope manufacturer’s eyepieces, the 65mm Pentax uses an American standard 1.25” (31.7mm) diameter eyepiece receptacle. In addition to the supplied excellent-quality Pentax XF zoom eyepiece, this system accepts single magnification Pentax XF 60° field eyepieces, the larger Pentax XW 70° field eyepieces, as well as more than 150 other 1.25” astronomical eyepieces from other manufacturers that can be found on the astronomics side of this website. If you want to expand your eyepiece capabilities beyond that of the supplied zoom, you can tailor the magnification and field of view precisely to your requirements with this Pentax. It’s something you can’t do with other spotting scopes that have a more limited range of eyepieces available.

For use with 1.25" eyepieces, the focal length of this scope is 390mm. You can calculate the magnification of a 1.25" eyepiece on this scope by dividing the scope's 390mm focal length by the focal length of the eyepiece. Divide the apparent field of view of the 1.25" eyepiece by this magnification to get the actual field of view in degrees.

Features that distinguish this scope from competitive scopes . . .

  • The optics – both scope and eyepiece – are fully multicoated with famous Pentax Super-Multi-Coating (SMC) antireflection coatings to maximize light transmission, clarity, and contrast.
  • Exceptionally close focusing, down to a very good 16.4 feet (5 meters).
  • The scope is supplied with a 20x to 60x zoom eyepiece. This provides a view that ranges from a 2.2° field at 20x (117’ @ 1000 yards) to a 0.97° field (51’ @1000 yards) at 60x. A groove in the zoom eyepiece barrel fits a pin in the scope's eyepiece receptacle. This keeps the eyepiece from accidentally loosening as the zoom magnification ring on the eyepiece is turned in cold weather. The eyepiece is specially sealed to be weatherproof under the worst observing conditions a birder might encounter, short of total submersion. Protective caps are provided for both ends of the eyepiece, as well as for both ends of the scope.
    The usable eye relief ranges from 14mm at 20x to 10mm at 60x. These somewhat-short figures will 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 rubber-rimmed twist-up 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 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.
    The scope can also use other brands of 1.25” astronomical eyepieces in addition to the Pentax eyepieces. A collet-type knurled ring locks the eyepieces in place, but allows eyepieces to be changed with just a twist of the wrist.
  • Other features of this scope . . .
  • Rugged and lightweight magnesium alloy body is nitrogen filled and O-ring sealed to be fogproof in all temperature extremes and waterproof to a depth of one meter (JIS grade 6). Nitrogen purging also prevents the internal formation of fungus in high humidity climates, such as rain forests.
  • Rubberized black paint on the scope body provides a sure grip in wet weather. The prism housing and lens shade are clad in black rubber armor to help shock-proof the optics.
  • Only three and a quarter turns of the ribbed rubber focusing knob located at the top of the scope moves from a very close focus of only 16.4 feet out to beyond the horizon.
  • The 65ED II Zoom mounts on any photo tripod having a standard 1/4”-20 thread mounting bolt. There are three 1/4”-20 mounting holes in the bottom of the mounting shoe to let you balance the scope more precisely, depending on whether you are using an eyepiece or the optional #PF-CA35 camera adapter.
  • A self-storing retractable lens shade improves the visual and photographic contrast.
  • A camera-type snap-in objective lens cover protects the optics while they are being transported or stored.
  • A sight line molded into lens shade aids in acquiring targets quickly, although the lens shade needs to be rotated to one side to use the sight line since the prism housing and eyepiece block the view along the top of the scope.
  • The scope’s 45° viewing angle is generally more comfortable than a straight-through scope for watching treetop activity or for extended observing from a blind or back porch. It is also more convenient for observing couples of varying heights who must share a single scope, as there’s little need to constantly raise and lower the tripod to a comfortable height for each observer.
  • For photography, you can use the Pentax #PF-CA35 camera adapter for Pentax K-mount cameras only. It converts the scope to a 780mm f/12 telephoto lens, with a 3.2° field of view and an 18’ close focus. There may be some very slight vignetting at the very corners of the field, but cropping the image by about 5% would get rid of the effect. A locking knob at the side of the scope body allows the barrel to be rotated left or right from a horizontal (landscape) to a vertical (portrait) orientation, with click stops every 45°. If photography is a major concern, the straight-through viewing #P652Z PF-65ED II Zoom might be more useful than this angled-viewing model, as a straight-through scope generally handles more instinctively like a camera/telephoto lens combination.
  • The supplied water-shedding Cordura-style nylon soft case has Velcro-fastened fold-back flaps that allow the scope to be mounted on a tripod and used while still in the case. Carrying handles are provided on the case.
  • 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:
    117' @ 20x; 51' @ 60x
    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.

    14mm @ 20x; 10mm @ 60x
    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.
    3.25mm @ 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.
    36.06 @ 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.
    Photographic Focal Length:
    The effective focal length of a spotting scope/camera adapter combination when the scope is used as a telephoto lens. The photographic focal length divided by 50 will give you the magnification of the combination compared to your standard camera lens.
    Photographic Focal Ratio:
    The photographic “speed” of a spotting scope/camera adapter combination when used for photography. The smaller the “f/ratio,” the faster the exposure (to capture birds in motion), or the dimmer the light level in which you can successfully shoot.
    The weight of this product.
    46.2 oz.
    "No-Fault" Limited Lifetime
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    Visual Accessories
    Eyepieces (1)
    8.5mm (46x) XF eyepiece for 65mm Pentax spotting scopes
    by Pentax
    Photographic Accessories
    Spotting Scope Accessories (1)
    Camera adapter (for Pentax K-mount cameras only)
    by Pentax
    • 20-60x XF-series zoom eyepiece
    • Dust covers
    • Lens cover
    • Self-storing lens shade
    • Fitted soft stay-on carrying case
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    Pentax - PF-65ED-A II Zoom, 65mm ED II 45° angled body with 20-60x XF-series zoom

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    Pentax - PF-65ED-A II Zoom, 65mm ED II 45° angled body with 20-60x XF-series zoom
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    Manufacturer Product #: KU70118
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    This Pentax 65mm aperture 45° viewing 20-60x zoom ED spotting scope puts premium Pentax image quality into a compact, comfortable to use, and very portable body . . .

    . . . our 38th year