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Tele Vue NP101is OTA Imaging SystemFor 25 years, TeleVue has pushed the boundaries of APO refractors, as well as eyepieces, to the recognized pinnacle of performance. We were gratified but not surprised that Backyard Astronomer's Guide said of the NP101: "optics don't get any betterRead MoreDetails on Tele Vue NP101is OTA Imaging System
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Tamron 2X AF Teleconverter for Canon EOSRead MoreOptical Zoom: 2X - Focal Length: 300mm
The 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6. Teleconverters are not recommended for lenses wider than 50mm, e.g. 28-105mm. However, full AF operation is only possible with lenses with open aperture of f/2.8 or brighter. Please be aware that AF ...Details on Tamron 2X AF Teleconverter for Canon EOS
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Omni XLT 150 5.9" / 150mm Newtonian Reflector kit Omni XLT 150 5.9" /150mm ...
Omni XLT series features the stable platform of the CG-4 mount and high quality optics. Using aspheric shaping technology in conjunction with hand-figuring the optics the Omni XLT presents an image with virtually no spherical aberration. We also added our famous StarBright XLT coating system to further enhance light transmission.Read MoreDetails on Omni XLT 150 5.9" / 150mm Newtonian Reflector kit Omni XLT 150 5.9" /150mm Newtonian Reflector Tele
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Kenko 2X Teleplus MC4 DG Teleconverter for Minolta/Sony AFRead MoreOptical Zoom: 2X - Focal Length: 300mm
The 2X teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2X, and will cut back the amount of light by 2 f/stops. For example, using a 2X teleconverter with a 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6. Teleconverters are not recommended for lenses wider than 50mm, e.g. 28-105mm. However, full AF operation is only possible with lenses with open aperture of f/2.8 or brighter. Please be aware that AF ...Details on Kenko 2X Teleplus MC4 DG Teleconverter for Minolta/Sony AF
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$124.95
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Tele Vue 12mm Nagler IV Eyepiece, fits 2" & 1.25".
Read MoreWeight: 1.5lb
When Tele Vue designed the Radian series of eyepieces, Tele Vue used the Nagler concept as the basis. However with the Radians, Tele Vue decided to balance size, weight, and cost relative to a consistent 20mm eyerelief. During the design process Tele Vue found that we could not only balance these factors for 1.25" focussers, but improved glass types lead to better imaging, contrast enhancement, reduced pincushion, ghost suppression, and a newer concept in a click-stop adjustable eyeguard as well.Applying that ...Details on Tele Vue 12mm Nagler IV Eyepiece, fits 2" & 1.25".
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Tamron 1.4X AF Teleconverter for Canon EOSRead MoreFocal Length: 420mm - Lens Aperture: 4f-stops
The 1.4x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 1.4x, and will cut back the amount of light by one f/stop. For example, using a 1.4x teleconverter with a 300mm lens will effectively increase the focal length to 420mm. A lens set to f/2.8 will now be f/4. Teleconverters are not recommended for lenses wider than 50mm, e.g. 28-105mm. However, full AF operation is only possible with lenses with open aperture of f/2.8 or brighter. Please be aware that AF ...Details on Tamron 1.4X AF Teleconverter for Canon EOS
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Tamron 2X AF Teleconverter for Nikon AF-DRead MoreOptical Zoom: 2X - Focal Length: 300mm
The 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6. Teleconverters are not recommended for lenses wider than 50mm, e.g. 28-105mm. However, full AF operation is only possible with lenses with open aperture of f/2.8 or brighter. Please be aware that AF ...Details on Tamron 2X AF Teleconverter for Nikon AF-D
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Tamron SP 1.4X Pro Teleconverter for Canon EOSRead MoreFocal Length: 420mm - Lens Aperture: 4f-stops
The Tamron SP AF Pro teleconverter features improved optical construction, and is designed to be used with lenses that are f/2.8 and of focal lengths of 90mm or greater.The 1.4x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 1.4x, and will cut back the amount of light by one f/stop. For example, using a 1.4x teleconverter with a 300mm lens will effectively increase the focal length to 420mm. A lens set to f/2.8 will now be f/4.Teleconverters are not ...In Stock
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Tele Vue New 5x Powermate Barlow lens 1.25" - T Ring Adaptable.Tele Vue Barlows: "An Optically Perfect Window " Properly designed Barlows do wonderful things. First, they amplify power while retaining the eyepiece's eye-relief. Second, they slow the telescope's f/#, which improves eyepiece sharpness. Third, the designer can introduce compensations for eyepiece aberrations. The 2.5X Powermate Barlow is a 4-element parfocal, compact amplifying lens system. POWERMATE consists of a negative achromatic doublet plus a positive "pupil-correcting" doublet. While it looks and ...Read MoreDetails on Tele Vue New 5x Powermate Barlow lens 1.25" - T Ring Adaptable.
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Sigma 1.4X EX DG APO Teleconverter for Canon EOSRead MoreFocal Length: 420mm - Lens Aperture: 4f-stops
This Tele Converter will multiply the focal lenght of the existing lens by 1.4x, and will cut back the amount of light by one f/stop. For example, using a 1.4x teleconverter with a 300 mm lens will effectively increase the focal length to 420mm. A lens set to f/2.8 will now be f/4. Note: Due to the high optical quality of this teleconverter, this item will only fit and work with a select list of lenses. Please click here for a compatibility chart of all compatible lenses. Note: The DG denotes added coating ...In Stock
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Kenko 1.5x DG AF Teleplus Teleconverter for Minolta/SonyRead MoreFocal Length: 450mm - Lens Aperture: 4f-stops
The 1.5x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 1.5x, and will cut back the amount of light by one f/stop. For example, using a 1.5x teleconverter with a 300mm lens will effectively increase the focal length to 450mm. A lens set to f/2.8 will now be f/4. This DG teleconverter has upgraded Gate-Array IC circuitry to work better with digital SLR's and some of the digital SLR lenses*. This means that the converter's unique circuitry maintains signal ...Details on Kenko 1.5x DG AF Teleplus Teleconverter for Minolta/Sony
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Kenko 1.5x DG AF Teleplus Teleconverter for Canon EOSRead MoreFocal Length: 450mm - Lens Aperture: 4f-stops
The 1.5x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 1.5x, and will cut back the amount of light by one f/stop. For example, using a 1.5x teleconverter with a 300mm lens will effectively increase the focal length to 450mm. A lens set to f/2.8 will now be f/4. This DG teleconverter has upgraded Gate-Array IC circuitry to work better with digital SLR's and some of the digital SLR lenses*. This means that the converter's unique circuitry maintains signal ...Details on Kenko 1.5x DG AF Teleplus Teleconverter for Canon EOS
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SIGMA 70-300 F4-5.6 APO DG MACRO AF FOR PENTAXRead MoreLens Aperture: 4f-stops
Sigma's 70-300mm f4-5.6 APO DG Macro is one of several tele zoom lenses. It is a compact Apochromatic tele zoom lens incorporating two Special Low Dispersion glass elements in the front lens group, plus one Special Low Dispersion glass element in the rear lens group, to minimize chromatic aberration.In Stock
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Tamron SP 2X Pro Teleconverter for Nikon AF-DRead MoreOptical Zoom: 2X - Focal Length: 90mm
The Tamron SP AF Pro teleconverter features improved optical construction, and is designed to be used with lenses that are f/2.8 and of focal lengths of 90mm or greater. The 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6. Teleconverters are not ...In Stock
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Kenko 2X Teleplus MC7 DG Teleconverter for Nikon AF-DRead MoreOptical Zoom: 2X - Focal Length: 300mm
The 2X teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2X, and will cut back the amount of light by 2 f/stops. For example, using a 2X teleconverter with a 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6. This DG teleconverter has upgraded Gate-Array IC circuitry to work better with digital SLR's and some of the digital SLR lenses. This means that the converter's unique circuitry maintains signal ...Details on Kenko 2X Teleplus MC7 DG Teleconverter for Nikon AF-D
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Tamron SP 2X Pro Teleconverter for Canon EOSRead MoreOptical Zoom: 2X - Focal Length: 90mm
The Tamron SP AF Pro teleconverter features improved optical construction, and is designed to be used with lenses that are f/2.8 and of focal lengths of 90mm or greater. The 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6. Teleconverters are not ...Details on Tamron SP 2X Pro Teleconverter for Canon EOS
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Tamron Zoom Telephoto 70-300mm f/4-5.6 Di LD Macro Autofocus Lens for Nikon AF-DRead MoreFocal Length: 70mm - Lens Aperture: 4f-stops
The Tamron AF 70-300mm f/4-5.6 Di LD Macro lens is a quality compact ultra tele zoom lens which covers the 70mm to 300mm telephoto range, with a maximum magnification ratio of 1:2 at the tele end. This lens delivers ultimate handling ease and portability in the field due to its lightweight size and mechanical operation. Best suited for shooting outdoors to make full use of the real telephoto of 300mm as well as providing diversity in portraiture using the medium focal length ranges of 70mm to 135mm. Di ...Details on Tamron Zoom Telephoto 70-300mm f/4-5.6 Di LD Macro Autofocus Lens for Nikon AF-D
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Sigma 70-300mm F4-5.6 APO DG Macro Autofocus Lens (With built in motor) for ...Read MoreLens Aperture: 4f-stops
Telephoto zoom lenses with tele-macro function, optimized for digital cameras. The high performance telephoto zoom lens is ideal for digital SLR cameras. This lens has two SLD glass elements in the front lens group and one in the rear lens group It is able to shoot with maximum magnification 1:2 at the focal length of 300 mm. It s the ideal lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. New coating reduces Ghost and Flare. The ...Details on Sigma 70-300mm F4-5.6 APO DG Macro Autofocus Lens (With built in motor) for Nikon AF-D Cameras
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Sigma 1.4X EX APO Teleconverter for Minolta/Sony AFRead MoreFocal Length: 420mm - Lens Aperture: 4f-stops
This Tele Converter will multiply the focal lenght of the existing lens by 1.4x, and will cut back the amount of light by one f/stop. For example, using a 1.4x teleconverter with a 300 mm lens will effectively increase the focal length to 420mm. A lens set to f/2.8 will now be f/4. Note: Due to the high optical quality of this teleconverter, this item will only fit and work with a select list of lenses. Please click here for a compatibility chart of all compatible lenses.&ref=BecomeDetails on Sigma 1.4X EX APO Teleconverter for Minolta/Sony AF
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Sigma 1.4X EX DG APO Teleconverter for Pentax AF
Read MoreFocal Length: 420mm - Lens Aperture: 4f-stops
This Tele Converter will multiply the focal lenght of the existing lens by 1.4x, and will cut back the amount of light by one f/stop. For example, using a 1.4x teleconverter with a 300 mm lens will effectively increase the focal length to 420mm. A lens set to f/2.8 will now be f/4. Note: Due to the high optical quality of this teleconverter, this item will only fit and work with a select list of lenses. Please click here for a compatibility chart of all compatible lenses. Note: The DG denotes added coating ...In Stock
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