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Choosing Your Telescope Eyepieces
When beginning astronomers start looking at telescopes, one of the least understood aspects of these optical instruments are simple telescope eyepieces. While lenses and mirrors and designs are easy to grasp, the actual eyepiece itself can be somewhat confusing. However, they are vital parts of the telescope, as they provide the final creation and magnification of the telescope image and they are the one part of the telescope that spends its time in almost constant contact with the person using it. All of which means that telescope eyepieces are important considerations when putting together a telescope.
When looking at telescope eyepieces, remember that you are essentially paying for the lenses in the eyepiece. The more an eyepiece costs, the better the lenses inside and the better the image it creates. And, because the rest of the telescope is only as good as the image that reaches the user?s eye, it is well worth the while to invest a little extra in the eyepieces to be used on a good telescope.
It is also good to remember that image quality of telescope eyepieces can be affected by the design of the eyepiece. For instance, Huygens eyepieces can create chromatic aberrations, Erfle eyepieces can produce some ghost images, and Plossl eyepieces tend to have some astigmatism around the edges of the image. So, when choosing eyepieces, it is also a good idea to understand the limits of each design and what sort of work each design is suited to.
Another aspect to consider when choosing telescope eyepieces is the apparent field of view. This is the apparent width of the image, in degrees, which indicates how far a person needs to move their eye in order to look from one end of the image to the other. Essentially, it is a measure of the peripheral vision available to the person looking through the eyepiece. Depending on the design of the telescope eyepiece, the apparent field of view can range from 40 to 82 degrees. Obviously, the narrower fields of view give the feeling of looking down a tunnel, making it more difficult to scan the sky and find objects.
However, the field of view and image clarity are not the only concerns with telescope eyepieces. A major, but often overlooked, trait is that of eye relief. This is the distance between the eye and the actual lens surface and it is vital that people understand its importance. After all, this can affect the person using the telescope by simply making it uncomfortable or difficult to use the telescope. If someone doesn?t have room to wear their glasses when they look through the eyepiece, or their eyelashes rub against the lens, it is simply not worth the effort to use the telescope. And if someone?s eyelashes are rubbing against the lens, it is transferring dust and oils to the lens, degrading the image and, in fact, making the telescope less effective. Of course, the only way to really find the right eye relief is to try out several telescope eyepieces and see which ones feel right.
Overall, telescope eyepieces are best judged through experience, which means that trying out several designs and models is the best way to figure out what works best. But, with a little trial and error, the right telescope eyepieces can make their way into your telescope kit.
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Nikon 8.5x56 Monarch ATB Binoculars 7517
Nikon 8.5x56 Monarch ATB Binoculars 7517
Nikon is a precision optical company with worldwide manufacturing, research and marketing capabilities. The Nikon name is equated with extraordinary photographic performance, innovation, precision and optical quality. Nikon's 8.5x56 offers an amazing 6.6mm exit pupil and 43.6 relative brightness index As with the entire Nikon Monarch family, the new 56mm Monarch ATB line is fully waterproof and fogproof and features fully multicoated lenses for maximum light transmission and image quality. The new ATBs incorporate Nikon's exclusive Eco-Glass (made without the use of arsenic or lead) for all lens and prism elements. Prisms feature phase-correction coatings and high reflection mirror coatings for superior sharpness and resolution. Ergonomic styling, mated with a rubber armored exterior, provides added shock resistance and a firm grip, wet or dry to the 7.8 x 5.7-inch Monarch. Turn and slide rubber eyecups, complemented by long eye relief, allow the binoculars to be used as comfortably by eyeglass wearers as those with uncorrected vision. A large central focus wheel and adjustable diopter make focus easy to achieve and maintain, even while wearing gloves.
Monocular - Specwell 4x 12mm
Monocular - Specwell 4x 12mm
Monocular telescope with soft protective case and eye cup.
Mug with cat, telescope, looking
Mug with cat, telescope, looking
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(C) ASTRONM/REFLCTR TELESCOPE
(C) ASTRONM/REFLCTR TELESCOPE
Magnacraft Short Tube Newtonian Astronomical Telescope with 115 and 215 Power. a telescope is an optical system designed to magnify distant objects. This telescope has an equatorial mount making it extremely versatile because it allows the scope to move in all directions. That allows you to track a stars movement across in the sky. It also has flexible cable controls making it ossible to move the telescope while you are looking through it. Professional quality. Measures 201/2" long and 7" diameter. Comes with 1.5x erecting eyepiece. 40 lbs each. 32300PT 643.95 Item #SPTEL2 Magnacraft Short Tube Newtonian Astronomical Telescope with 115 and 215 Power. a telescope is an optical system designed to magnify distant objects. This telescope has an equatorial mount making it extremely versatile because it allows the scope to move in all directions. That allows you to track a stars movement across in the sky. It also has flexible cable controls making it ossible to move the telescope while you are looking through it. Professional quality. Measures 201/2" long and 7" diameter. Comes with 1.5x erecting eyepiece. 40 lbs each. 32300PT 643.95 Item #SPTEL2
Telescope Casual 146X/147X/272X Savona II Dining Set
Telescope Casual 146X/147X/272X Savona II Dining Set
Telescope Casual 146X/147X/272X This smart collection is as comfortable as it is beautiful. The Savona Cushion Collection is made from a combination of tubular legs, cast arms and comfortable suspended strap seating. The seat cushions are plush and the round contoured backrest cushion is tufted in the middle to keep the cushion's fibers firmly in place while also creating an additional lumbar support. This set includes 1 42" Round Glass Table and 4 Arm Chairs. You may choose to switch 2 of the Arm Chairs for 2 Swivel Rockers. Features: Frames: -Made of heavy duty cast aluminum -Fully welded and sanded for a seamless appearance -Available in 8 powder coat finishes -Bonded with polyester coat to prevent peeling and cracking -Ships fully assembled -Fifteen year residential warranty Cushions: -Available in 98 exciting fabrics -Made of acrylic and other outdoor materials -Features a rain-thru foam core -Cushions rest on suspended straps for plush comfort Dimensions& Specifications:: -Swivel Rocker: 24.5"W x 37"H x 31.5"D -Table: 42" Round x 28"H -Arm Chair: 24.5"W x 37"H x 31.5"D About Telescope Casual Telescope has stood the test of time. Collections like Gardenella have been around for nearly 30 years, and Director Chairs are still very popular. Our powder-coated frames and replaceable straps and slings are often imitated, but with Telescopes high-quality craftsmanship and customer warranty, you wont find a better value. Telescopes Collections Include: -Cast Aluminum Collections -Cushion Collections -Sling Collections -Strap Collections -Director Chair Collections -Beach Chairs & Folding Leisure Furniture -Market & Drape Umbrellas -Table Collections -Accessory Items Shaping the future of outdoor furniture design, we at Telescope are striving to remain an industry leader in quality control, innovations, unsurpassed customer service, education, and employee/dealer support, today and for the next 100 years. Telescope Casual Furniture Warranty If your Telescope powder
Telescope Casual 774 Bella Lucca Bar Height Outdoor Swivel Chair
Telescope Casual 774 Bella Lucca Bar Height Outdoor Swivel Chair
Telescope Casual 774 The distinct style of this beautiful collection provides discerning customers with an upscale outdoor cast furniture option. Bella Lucca is manufactured using a special sand - cast process to create a handcrafted appearance. Designed to be the most comfortable cast seating on the market, the chairs can be used with our without our stylish new Seat Pads. The counter height swivel works as a stylish balcony chair or as the perfect complement to a barbecue island. Features: Frames: -Made of heavy duty extruded tubular aluminum frame -Frame pre-assembled with reinforced press fits and stainless steel lag screws -Available in 9 powder coat finishes -Bonded with polyester coat to prevent peeling and cracking -Suited for Residential use only -Suited for Residential use only Slings: -Available in 69 exciting fabrics -Made of vinyl-coated polyester mesh and other outdoor materials -Weather resistant and easily replaceable -Suited for Residential use only -Suited for Residential use only Additional Information: -Dimensions: 23.5"W x 45.5"H x 26.5"D -Seat Height: 28"H -Arm Height: 35.5"H -Commercial quality -Fifteen year residential and five year commercial warranty -Ships fully assembled -Bella Lucca seat cushions (CCRS) available and sold separately -Suited for Residential use only -Suited for Residential use only About Telescope Casual Telescope has stood the test of time. Collections like Gardenella have been around for nearly 30 years, and Director Chairs are still very popular. Our powder-coated frames and replaceable straps and slings are often imitated, but with Telescopes high-quality craftsmanship and customer warranty, you wont find a better value. Telescopes Collections Include: -Cast Aluminum Collections -Cushion Collections -Sling Collections -Strap Collections -Director Chair Collections -Beach Chairs & Folding Leisure Furniture -Market & Drape Umbrellas -Table Collections -Accessory Items -Suited for Residential use only -Suited for Res
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