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AC Lens - Retailer offers contacts, as well as accessories. Also includes articles and a help forum.

Gravitational Lenses - Site hosted by the Universit� de Li�ge; features a bibliography, a list of lensing candidates, and descriptions of didactical experiments (involving glass lenses) useful for a better understanding of the phenomenon.

A Moment in the Zoom of a Lens: Towards a Discursive Psychology of Mathematics Teaching and Learning - Stephen Lerman, Centre for Mathematics Education, South Bank University. An attempt to outline a research programme for mathematics education which is firmly based in cultural, discursive psychology.

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Camera Surveillance - ... no delay Runs on 9-volt battery or AC adapter (battery not included) Composite video connections on ... cable 9-volt battery adapter for camera Camera AC adapter (120V, 60Hz; 7.5V, 200 mA) Receiver AC adapter (120V, 50Hz; 12V 500 mA) Antenna ...

'Digital Camera Starter Kit' - ... in. Mini tripod Memory card wallet 5-piece lens cleaning kit Screen protectors Some devices only accept ... camera cleaning kit and compact binoculars. Digital single-lens reflex camera - A digital single-lens reflex camera (digital SLR or DSLR) is ...

Digital Camera Lens Review - Digital Camera Lens Review Konica Minolta Maxxum 7D 6.1MP SLR Digital Camera with 18-70mm Lens Perfect for the photographer trying to make the ... represents a culmination of the optical digital camera lens review and photo imaging expertise of two ...

Case Eyepiece - ... white balance control Binocular Specs Power: 8x Objective lens: 30 mm Optical design: Folding roof prism Angle ... 640 x 480 pixels Aperture: F5.6; fixed lens Optimum Range: 49 feet to infinity Memory: 8 ... the diameter (in millimeters) of the objective (front) lens. The larger the objective lens, the more ...

Auto Supply Upholstery - ... Description Input Voltage 115 V ACor 230 V AC Power Supply 3.3 V DC Device Input ... A @ 3.3V DC 0.2 A @ 115V AC 0.2 A @ 4 Pack Q-SEE CCTV ... O" ring seal to keep the high resolution lens and the internal parts safe from nature ...

'Universal Digital' - ... photographs ever captured. Located outside of the distorting lens of Earth's atmosphere, the Hubble can see ... colloquially referred to as a "dry ... Digital Camera Lens Review - Digital Camera Lens Review The Master Guide to Digital SLR ...

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Epson PowerLite 1810p MultiMedia Projector, V11H233020 : Deliver brilliant presentations in virtually any room with 3500 lumens Set up in 6-seconds with Quick Setups automatic image adjustment to fit your screen Enjoy positioning flexibility with 1.6x zoom ratio and quick corner adjustments Get natural color and bright, vibrant images with 3LCD technology Enjoy the full audio aspect of any presentation with built-in 5W speaker Use remote-free power control on installed units with direct power on/off Easily access and replace the lamp and air filter, even if the projector is mounted Bring brilliant presentations anywhere with this lightweight, 6.5 lb projector Take control of your presentation sound and image turn off instantly with A/V Mute Slide Technology Details 3 x LCD Panel Video Signals NTSC 4.43, PAL M, N, 60, SECAM, HDTV 480i, 480p, 720p, 1080i Power cable Computer cable Projector remote control Batteries Soft carrying case CD-ROM Quick Setup Sheet PrivateLine support card Password protection sticker Minimum Lens Aperture F/1.75 Set up in 6-seconds with Quick Setup's automatic image adjustment to fit your screen Kensington-style l...

Epson PowerLite 1825 Multimedia Projector, V11H274020 : Deliver brilliant presentations, even in well lit rooms, with 3500 lumens Project video and audio wirelessly with 802.11a/b/g via Windows Vista or included EasyMP software Monitor and control installed projectors over the wired LAN Set up in seconds with Quick Setups 6-second automatic image adjustment Get natural color and bright, vibrant images with 3LCD technology Enjoy added positioning flexibility with 1.6x zoom ratio and quick corner adjustment Use remote-free power control on installed units with direct power on/off Easily access and replace the lamp and air filter even if the projector is ceiling-mounted Take control of your presentation sound and image turn off instantly with A/V Mute Slide Display most image files without a computer via CompactFlash or USB memory device Technology Details 3 x LCD Panel Network Support Yes Storage Media USB Memory Slot Standard Warranty 2 Year Limited Minimum Lens Aperture F/1.75 Wired LAN module Power cable Computer cable Projector remote control Soft carrying case Batteries CD-ROM Quick Setup Sheet PrivateLine support card Password ...

ESAB HW-26FV, 75TIG Flex Head w/ 25' Cable : ESB1012: Ships Via Small Parcel Ground For TIG welding applications. Features a quick release of electrodes, and rugged silicon rubber body to provide improved resistance to breakage in rough duty. Flexible head models provide added versatility for reaching hard-to-reach applications. Specifications: Head Angle: 75 Degree Cable Length: 25 ft HW-26 Capacity continuous-duty AC or DC with standard accessories 160 Amps continuous-duty AC or DC with gas lens accessories 200 Amps @ 50pct duty AC or DC 220 Amps Size: Overall Length 8-7/8 in 225 mm Handle Diameter 1-7/32 in. 31 mm Length of Head (short cap) 3-3/4 in. 95 mm (medium cap) 5-3/8 in. 136 mm (long cap) 7-3/8 in 187 mm Diameter of Head 29/32 in 23 mm Weight (less cable) 7.

Canon Vixia HG20 Black HDD Camcorder, High-Def, 12x Optical Zoom, 60 GB Hard Drive : FXP (17 Mbps) 7 hours 50 minutes MXP (24 Mbps) 5 hours 30 minutes Greater recording time is possible by adding an SDHC Memory Card Lens Zoom Ratio 12x Optical / 200x Digital Focal Length f=4.8 - 57mm Zoom Speed Variable / 3 Fixed Zoom Speeds Max. F/Stop f/1.8-3.0mm Filter Size 37mm Focusing System Instant AF, Through the Lens / Manual Focusing Possible Manual Exposure Programmed AE Auto, Program, Av, Tv, CINEMA, Portrait, Sports, Night, Snow, Beach, Sunset, Spotlight, Fireworks Max Shutter Speed 1/2000, 1/500 (card) Auto Date/Time Yes Record Search/Review Yes Minimum Focusing Distance 10mm (wide) / 1m (tele) White Balance Daylight, Shade, Cloudy, Tungsten, Flourescent, Flourescent H, Auto, Manual Minimum Illumination Night mode .2 lx (shutter 1/2 sec.) Image Stabilization SuperRange Optical (lens shift) LCD Screen 2.7" Widescreen LCD (approx. 211,000 pixels) Microphone Built-In 3.5mm stereo mini jack, Mini Advanced Accessory Shoe Flash Built-In USB Terminal mini B, USB 2.0 Hi-Speed supported Video Terminal component (output), composite (output) Audio Dolby Digital 2ch (AC-3 2ch)HDMI Terminal...

Panasonic BL-C101A Residential IP Network Camera : Image Compression: JPEG (Motion JPEG for moving image dsiplay), MPEG-4 Quality Video Resolution: 640 x 480, 320 x 240 (default), 192 x 144 Image Quality: JPEG (favor clarity, standard, favor motion), MPEG4 Authentication: User ID/Password, SSL Supported Network Protocols: IPv4 / IPv6 Dual Stack Simultaneous Viewers: Max. 30 simultaneous access (Max. 10 access in HTTPS communication) Buffered Images: Approx. 250 images (320 x 240) - standard image quality - with time display Image Buffer: Alarm, time or motion detection-Image Buffer Triggers Image Transfer via E-Mail (SMTP) or FTP: SMTP, FTP, HTTP Zoom: 10x digital zoom (by area) Image Sensor: 1/4 inch CMOS sensor, approx. 320,000 pixels Viewing Angle: Horizontal: 58° / Vertical: 45° Required Light Intensity: 5 to 10,000 lux (in Color Night View Mode: 3 to 10,000 lux) Lens Focus Point: Fixed CODEC: ADPCM (32kbps) Input: Built-in Microphone Network Connection: Ethernet (10Base-T/100Base-TX) External I/O Connector: 1 input Operating Temperature: +5°C to +40°C (+41°F to +104°F) Operating Humidity: 20-80% RHG, non-condensing Power Source: A...

Panasonic BL-C111A PetCam Network Camera : Image Compression: JPEG (3 levels), MPEG Quality Video Resolution: 640 x 480, 320 x 240 (default), 192 x 144 Image Quality: JPEG (favor clarity, standard, favor motion), MPEG4 Frame Rate: Max. 30 frames/sec (640 x 480, 320 x 240 or 192 x 144) Authentication: User ID/password IPv4/v6: IPv4/v6 Dual Stack Supported Network Protocols: IPv4 / IPv6 Dual Stack Simultaneous Viewers: 30 Buffered Images: Approx. 250 images (320 x 240) - standard image quality - with time display Image Buffer: Alarm, time or motion detection-Image Buffer Triggers Image Transfer via E-Mail (SMTP) or FTP: SMTP, FTP, HTTP Free DDNS Compatible: Yes Cellular Phone Compatibility: View Snapshot and Control from Compatible Cell Phone Multi-Language Interface: Yes Zoom: 10x digital zoom (by area) Image Sensor: 1/6" CMOS sensor, approx. 320,000 pixels Viewing Angle: Horizontal: 49° (total 149°); Vertical: 37° (total 87°) Remote Pan Angle: -50° up to +50° Remote Tilt Angle: -40° to +10° (or less based upon user setting) Maximum Pan/Tilt Speed: Pan: 50°/sec; Tilt: 50°/sec Lens Brightness: F2.8 Required Light Intensity: 1...

Panasonic KX-BL-C140A Outdoor Network Camera : Image compression: JPEG (Motion JPEG), MPEG-4 Video resolution: 640 x 480, 320 x 240 (default), 192 x 144 Image quality: JPEG (favor clarity, standard, favor motion), MPEG-4 Frame rate: Max. 30 frames/sec (640 x 480, 320 x 240 or 192 x 144) Security: User ID/password, HTTPS Supported protocols: IPv4 / IPv6 Dual-Stack User access limit: Max. 30 simultaneous accesses (max. 10 users in JPEG mode or 5 accesses in MPEG-4 mode with HTTPS communication) Buffered images: Approx. 250 images (320 x 240) Image transfer method: SMTP, FTP, HTTP Image buffer/transfer triggers: Timer or motion detection Zoom: 10x digital zoom (by area) Viewing angle: 58 ° horizontal / 45 ° vertical Sensor type: 1/4 inch CMOS sensor, approx. 320,000 pixels Lens focal point: Fixed (focal range: 0.3 m to ) Lens brightness: F2.8 Required light intensity: 5 to 10,000 lux (in color night view mode: 3 to 10,000 lux) Network interface: Ethernet (10Base-T/100Base-TX) Operating temperature: -20°C to +50°C (-4°F to +122°F) Operating humidity: 20% to 90% (no condensation) Dimensions (H x W x D): 106 x 106 x 57 mm Weight (only th...

Astak CM-IP-150 Wireless IP Camera : Display & Graphics Sensor Type CMOS Video Resolution 640 x 480 @ 15 fps Motion JPEG 320 x 240 @ 20 fps Motion JPEG Illumination 2.0Lux - @F2.0 Color Support Color Lens Lens Type Focal Length: 6.0mm Network & Communication Connectivity Technology Wireless Cable Wireless Technology IEEE 802.11b/g Protocols TCP/IP SMTP HTTP FTP DHCP NTP DDNS PPPoE Interfaces/Ports Interfaces/Ports 1 x RJ-45 Network 1 x DC Power Input Power Description Input Voltage 5 V DC Physical Characteristics Dimensions 3.35" Height x 2.95" Width x 1.73" Depth - antenna and stand excluded Miscellaneous Package Contents CM-IP-150 Wireless IP Camera Documentation and software CD Ethernet cable (Cat/5e) AC adapter Quick installation guide Warranty card Camera stand bracket Additional Information Users: 3 simultaneous users Reset Button: Use stick to touch reset button to restore factory default settings OSD Function: Image can be overlaid with timestamp System Requirements PC: Pentium III CPU 500MHz or higher, or equivalent AMD 256MB RAM Windows 2000 and XP Internet Explorer 6. Electronics/SurveillanceEquipment/ Electronics,Su...

Panasonic KX-BL-C160A Outdoor Network Camera : Image compression: JPEG (Motion JPEG), MPEG-4 Video resolution: 640 x 480, 320 x 240 (default), 192 x 144 Image quality: JPEG (favor clarity, standard, favor motion), MPEG-4 Frame rate: Max. 30 frames/sec (640 x 480, 320 x 240 or 192 x 144) Security: User ID/password, HTTPS Supported protocols: IPv4 / IPv6 Dual-Stack Buffered images: Approx. 250 images (320 x 240) Image transfer method: SMTP, FTP, HTTP Image buffer/transfer triggers: Sensor,timer or motion detection Zoom: 10x digital zoom (by area) Viewing angle: 58 ° horizontal / 45 ° vertical Sensor type: 1/4 inch CMOS sensor, approx. 320,000 pixels Lens focal point: Fixed (focal range: 0.3 m to ) Lens brightness: F2.8 Required light intensity: 5 to 10,000 lux (in color night view mode: 3 to 10,000 lux) Type: 2 White LEDs Brightness: Directly in front of camera: about 8.5 lux / 20° to left/right of camera: about 2.5 lux Network interface: Ethernet (10Base-T/100Base-TX) Operating temperature: -20°C to +50°C (-4°F to +122°F) Operating humidity: 20% to 90% (no condensation) Dimensions (H x W x D): 148 x 108 x 64 mm Weight (only the uni...

Zadro Products Ultimate Makeup Mirror in White : Zadro makeup mirror shown in a crystal white finish ZPS1044: Ships Via Small Parcel Ground This is the ultimate makeup mirror which provides you with 2 convenient mirrors. With its illuminated 1x and 10x magnification mirrors you'll get the light that you really need to apply make-up. This mirror offers a 360-degree swivel design so you can put the lens at the angle you prefer. A travel pouch is included so you can bring this makeup mirror with you wherever you go! Features: Elegant crystal white finish Adjustable height control to a high 16'' Lifetime bulb Closes to a mere 1'' 360 Degree swivel AC adapter included 4 AA batteries for 10-hour battery life LCD digital clock/alarm Travel pouch included Overall dimensions: 1.5'' H x 7'' W x 6.

Zadro Products Power Zoom Vanity Mirror : Zadro power zoom vanity mirror with adjustable magnification level ZPS1041: Ships Via Small Parcel Ground The innovative design of this extraordinary vanity mirror will change the way you think about magnification. The motorized mechanism in the mirror adjusts in seconds with the touch of a button, allowing it to zoom in and out like a camera lens from 1x to 5x magnification. The multiple magnifications allows you to customize to your eyes. There are 3 light-emitting diode lights positioned around the mirror for maximum lighting. You can use the handheld grip for close-up viewing or leave it on it's base and use it s a vanity mirror. Features: Power zoom mirror from 1x to 5x magnification Fog-free mirror Battery operated/AC adapter Overall dimensions: 6.75'' H x 10.75'' W x 10.

SVAT Wireless Security System with Color Pinhole Camera & Handheld Monitor : "The GX5204 is a wireless color camera system that can be hidden for undercover indoor use. It comes with everything you need to start monitoring. The camera is tiny, but just as powerful as most full size cameras with an incredible 360 TV lines of resolution! Due to its pinhole lens it can be hidden anywhere. It is also a transmitter, allowing you to wirelessly send video to the included handheld monitor. The monitor has a 2.5"" LCD screen for crystal clear viewing of your camera's display, or you can connect it to your TV, VCR, DVR or computer for viewing and recording purposes. This system comes with one camera, but you can add 2 more SVAT compatible cameras, and the auto feature allows you to cycle between the cameras at intervals that you choose. This system is ideal for discreet monitoring in home or business settings due to its small size and wireless capabilities. The camera and monitor are both powered by AC adapters but are also battery operable for ultimate portability (camera uses 9V battery; monitor uses 4 AAA batteries, or rechargeable battery pack - GX519B, not included).

Tamrac Areo 80 Photo/Laptop Backpack : This lightweight, high-mobility pack provides foam-padded protection and quick access to multiple SLRs, lenses, flash and accessories. Product Material: PolyTek and Ballisitic Nylon Product Weight: 2.60 lbs. The completely foam-padded lower compartment protects photo equipment, while the large top compartment holds a light jacket, lunch or other necessary personal items. Inside the top, three mesh pockets keep AC adaptors and laptop cords organized. A separate, completely foam-padded compartment with a water-resistant zipper provides quick access to most 17" screen laptops (such as Apple's 17" MacBook Pro) without disturbing photo gear. Double zipper pulls allow quick access to photo gear while a weather flap provides weather protection. Inside the main compartment, foam pillars support the camera with lens attached, ready for action, while adjustable, foam-padded dividers protect other equipment. Two zippered pockets inside the main compartment organize filters, memory cards, and other accessories. A front mesh pocket and two mesh side pockets provide quick access to accessories and water ...