Mirror Lens

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Blue Mirrored Double Lens Safety Glasses
blue mirrored double lens safety glasses
$6.99
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Mirrored Double Lens Safety Glasses
mirrored double lens safety glasses
$5.99
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Pyramex ZONE II Safety Glasses SB3370E Silver Mirror Lens with Matte Black Frame
pyramex zone ii safety glasses sb3370e silver mirror lens with matte black frame
$6.98
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Pyramex ZONE II Safety Glasses Black Frame Silver Mirror Lens
pyramex zone ii safety glasses black frame silver mirror lens
$4.75
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Pyramex ZONE II Safety Glasses Black Frame Ice Blue Mirror Lens
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$4.75
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Pyramex ZONE II Safety Glasses Silver Frame Blue Mirror Lens
pyramex zone ii safety glasses silver frame blue mirror lens
$4.75
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NEW Edge Eyewear Dakura Clear Mirror Lens Safety Glasses SW111AR G
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$8.79
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Nemesis Style Safety Glasses w Black Mirror Lens Meet ANSI Standards UV400
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$4.50
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Pyramex Intrepid Safety Eyewear Black Frame Silver Mirror Lens Lot of 12
pyramex intrepid safety eyewear black frame silver mirror lens lot of 12
$39.99
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Edge Eyewear Reclus Safety Glasses Black with Silver Mirror Lens
edge eyewear reclus safety glasses black with silver mirror lens
$15.89
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DeWalt Radius Safety Glass Silver Mirror Polycarbonate lens DPG51 6C Black
dewalt radius safety glass silver mirror polycarbonate lens dpg51 6c black
$12.84
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Pyramex Itek Safety Glasses Gray Temple Silver Mirror Lens S5870S One Dozen
pyramex itek safety glasses gray temple silver mirror lens s5870s one dozen
$40.00
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SAFETY GLASSES BLUE MIRROR LENS SPORT WORK EYEWEAR PYRAMEX ZTEK S2575S 12 PAIR
safety glasses blue mirror lens sport work eyewear pyramex ztek s2575s 12 pair
$32.00
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SAFETY GLASSES BLUE MIRROR LENS SPORT WORK EYEWEAR PYRAMEX ZTEK S2575S 6 PAIR
safety glasses blue mirror lens sport work eyewear pyramex ztek s2575s 6 pair
$19.00
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SAFETY GLASSES BLUE MIRROR LENS SPORT WORK EYEWEAR PYRAMEX ZTEK S2575S 3 PAIR
safety glasses blue mirror lens sport work eyewear pyramex ztek s2575s 3 pair
$11.00
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SAFETY GLASSES BLUE MIRROR LENS SPORT WORK EYEWEAR PYRAMEX ZTEK S2575S 1 PAIR
safety glasses blue mirror lens sport work eyewear pyramex ztek s2575s 1 pair
$5.99
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Pyramex Intrepid Safety Eyewear Black Frame Silver Mirror Lens Sold in Each
pyramex intrepid safety eyewear black frame silver mirror lens sold in each
$6.99
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Blue Moon Flash Mirror Lens Safety Glasses box of 12
blue moon flash mirror lens safety glasses box of 12
$29.00
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Superbs Mirrored Double Lens Safety Glasses
superbs mirrored double lens safety glasses
$6.99
quality
Pyramex ZONE II Safety Glasses Black Frame Ice Blue Mirror Lens
pyramex zone ii safety glasses black frame ice blue mirror lens
$6.99
quality
10 Pair Gateway StarLite Safety Glasses Clear Mirror Indoor Outdoor Lens 460M
10 pair gateway starlite safety glasses clear mirror indoor outdoor lens 460m
$22.49
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3M SF400M WV 6 Safety Glasses Indoor Mirror Lens
3m sf400m wv 6 safety glasses indoor mirror lens
$17.24
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PYRAMEX ZONE Safety Glasses Black Frame Silver Mirror Lens SB97OE New
pyramex zone safety glasses black frame silver mirror lens sb97oe new
$5.50
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3M 90987 80025 Fuel Sport Safety Glasses Tekk Protection Red Mirror Lens
3m 90987 80025 fuel sport safety glasses tekk protection red mirror lens
$17.88
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Visio V20 Safety Glass Blue Mirror Polycarbonate Lens Black Plastic Frame
visio v20 safety glass blue mirror polycarbonate lens black plastic frame
$4.57
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Edge Eyewear Canada SDKAP419 Safety Glasses Khor Series Red Mirror Lens Colo
edge eyewear canada sdkap419 safety glasses khor series red mirror lens colo
$15.72
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NEW Smith and Wesson Safety Glasses 21301 Blue Mirror Lens Frames 12 Pack
new smith and wesson safety glasses 21301 blue mirror lens frames 12 pack
$69.99
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HD802 Scratch Resistant Safety Glasses Silver Mirror Lens Color
hd802 scratch resistant safety glasses silver mirror lens color
$22.94
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Skullerz Odin Safety Sunglasses Black Frame Blue Mirror Lens
skullerz odin safety sunglasses black frame blue mirror lens
$25.47
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Jackson Safety V30 Nemesis Safety Glasses 14481 Blue Mirror Lenses with Black
jackson safety v30 nemesis safety glasses 14481 blue mirror lenses with black
$92.88
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Gateway Safety 467M UL Certified StarLite Safety Glasses Gold Mirror Lens Gray
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$50.04
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Volk 3 Mirror Diagnostic Laser Lens
volk 3 mirror diagnostic laser lens
$299.00
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Ocular Instruments OG3M Three Mirror Universal Lens
ocular instruments og3m three mirror universal lens
$89.00
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Costa Brine Sunglasses Black Matte Frame with 580G Green Mirror Lens
costa brine sunglasses black matte frame with 580g green mirror lens
$239.00
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Costa Fathom Sunglasses 580G LightWAVE Glass Lens Green Mirror
costa fathom sunglasses 580g lightwave glass lens green mirror
$239.00
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Costa Brine Sunglasses Black Matte Frame with 580G Blue Mirror Lens
costa brine sunglasses black matte frame with 580g blue mirror lens
$239.00
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Costa Fathom Sunglasses 580G LightWAVE Glass Lens Blue Mirror
costa fathom sunglasses 580g lightwave glass lens blue mirror
$239.00
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4 Mirror Handheld Gonioscope Lens Ophthalmology Free Shipping World Wide
4 mirror handheld gonioscope lens ophthalmology free shipping world wide
$66.50
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4 Mirror Handheld Gonioscope Lens Ophthalmology KFW E 61
4 mirror handheld gonioscope lens ophthalmology kfw e 61
$72.92
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Cynosure Apogee LASER rail for Alexandrite HR OC turning mirror focus lens diode
cynosure apogee laser rail for alexandrite hr oc turning mirror focus lens diode
$931.00
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MICROSCOPE LEITZ GERMANY ILLUMINATOR MIRROR + LENS OPTICS AS IS BIN2B E 04
microscope leitz germany illuminator mirror + lens optics as is bin2b e 04
$169.00
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OPTICAL MICROSCOPE LEITZ PART BRASS MOUNTED LENS + MIRROR OPTICS BINJ6 03
optical microscope leitz part brass mounted lens + mirror optics binj6 03
$189.00
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Ocular Instruments Small three mirror laser lens OG3MSA
ocular instruments small three mirror laser lens og3msa
$265.00
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Ocular Instruments Large three mirror laser lens Gonio
ocular instruments large three mirror laser lens gonio
$125.00
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Jackson Safety Nemesis Safety Glasses Black Frame Blue Mirror Lens
jackson safety nemesis safety glasses black frame blue mirror lens
$20.39
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BEST OFFER FOR 90 D ASPHERIC LENS+ SURGICAL OPERATING LOUPE+4 Mirror Gonioscope
best offer for 90 d aspheric lens+ surgical operating loupe+4 mirror gonioscope
$357.60
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90 D ASPHERIC LENS+ SURGICAL OPERATING LOUPE+4 Mirror Gonioscope
90 d aspheric lens+ surgical operating loupe+4 mirror gonioscope
$357.60
quality
BEST QUALITY 90 D ASPHERIC LENS+ SURGICAL OPERATING LOUPE+4 Mirror Gonioscope
best quality 90 d aspheric lens+ surgical operating loupe+4 mirror gonioscope
$357.60
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90 D ASPHERIC LENS+ SURGICAL OPERATING LOUPE+4 Mirror Gonioscope made in India
90 d aspheric lens+ surgical operating loupe+4 mirror gonioscope made in india
$357.60
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Indian Made 90 D ASPHERIC LENS+ SURGICAL OPERATING LOUPE+4 Mirror Gonioscope
indian made 90 d aspheric lens+ surgical operating loupe+4 mirror gonioscope
$357.60
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science surg 90 D ASPHERIC LENS+ SURGICAL OPERATING LOUPE+4 Mirror Gonioscope
science surg 90 d aspheric lens+ surgical operating loupe+4 mirror gonioscope
$358.80
quality
Volk 4 mirror Handheld gonio lens
volk 4 mirror handheld gonio lens
$375.00
quality
Volk 3 mirror Gonio fundus lens
volk 3 mirror gonio fundus lens
$275.00
quality
Volk 4 mirror HIgh Mag Handheld gonio lens
volk 4 mirror high mag handheld gonio lens
$375.00
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Mirror Lens

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Samyang 500mm F8 Mirror Lens

SLR Cameras - What is a Single Lens Reflex?

The hottest thing in the digital camera market is undoubtedly the digital SLR, which is better known as a dSLR. While dSLRs are flying off dealer shelves, many new users are confused about the terminology. Most people know that SLR stands for "single lens reflex." Since nearly all SLRs accept interchangeable lenses, it would appear they should be known as multiple lens reflex (MLR) cameras.

If you want to understand how the SLR received it's name, you have to dip into the history of the camera. Early cameras were similar to the view cameras used today. The photographer looked through the lens, focused, composed and then inserted a single film plate behind the optics to make an image. While the entire process was crude by modern standards, the photographer enjoyed great control, since he looked directly through the actual imaging lens to compose the shot.

While this was fine for still life, portraits and landscapes, this process did not lend itself to action photography. These early cameras could only record a single image at a time. Which is why you have never seen a motor-driven view camera.

Realizing the need to offer sequences of exposures, camera makers begin to experiment with various roll-film designs. With a roll of film in the camera, the photographer could fire off numerous images without reloading. Although this improved throughput dramatically, it caused another problem. The roll of film had to pass closely behind the camera's optics, which meant that the photographer could no longer look through the camera lens to compose and focus.

Rangefinder cameras appear to keep things in focus

The lower-end, consumer roll-film cameras generally used an inexpensive "fixed-focus" lens, so a simple viewfinder was sufficient. Better quality optics, however, require the lens to be focused, and since the photographer could not look through the lens with a roll-film camera, this was a major problem. One of the first solutions to this problem was the Rangefinder -- a type of camera that offered a distance measuring scale in the viewfinder. By determining the range from the viewfinder, the photographer could then adjust the focus to match -- usually with very good results.

Twin Lens Reflex cameras offer another solution

While the rangefinder type cameras worked well, the camera industry is always evolving. A second method of allowing the photographer to focus and compose appeared in the "Twin-Lens Reflex" cameras. These cameras used two identical lenses, arranged one on top of the other in the manner of an over-and-under shotgun. The film winds past the lower lens, while the photographer can focus through the upper lens. The twin-lens cameras were fairly bulky, so designers added a mirror and ground glass to the top of the camera, hence the term "reflex.

Now the user could hold the camera at waist level and look down at the ground glass which previewed the image via the mirror located behind the upper lens. As the user adjusted the focus on the upper lens, a gear mechanism moved the lower "taking lens" to match.

While both rangefinders and twin-lens reflex cameras offered a credible way to focus and preview a shot, neither allowed the photographer to actually look through the actual lens. This sometimes made exact composition difficult.

SLRs take cameras another step forward

In their quest to allow users to see through the actual "taking" lens, camera makers turned to the periscope -- a simple device using two mirrors placed at opposite angles to bend the light path. Periscopes are easy to understand -- any kid can construct one from a couple of mirrors and some scrap wood.

In a camera, the lower mirror is placed at a 45 degree angle directly behind the lens. Light striking the mirror is projected upwards to a ground glass. While a second mirror would show the image on the ground glass to the user, it would not appear right, because mirrors tend to reverse things. So camera designers added a prism arrangement that corrects the reversed image. When you peer through the viewfinder on a SLR, you look through a prism, which displays the image on a ground glass, which displays the projected image from the mirror located behind the lens.

There is just one problem. If you have been paying attention, you have no-doubt realized that the lower mirror blocks the light path to the film (or digital sensor as the case may be.) Now the photographer can look though the lens, but the image cannot be projected on to the filmplane.

So the camera designers had to add another wrinkle. They had to move that mirror. Just long enough to make an exposure, since when the mirror moved, the photographer could no longer see anything through the lens. So they designed the "instant-return" mirror. At the instant of exposure, the mirror flies upward, the shutter fires and the mirror snaps back down. It is a incredible feat, when you consider that instant return mirrors have to flip up and back in a heartbeat, over and over for the life of the camera.

Once the instant return mirror was perfected, photographers could once again design their images by looking through the lens. Unlike the twin lens reflex, this new breed of camera needed only one lens to focus and shoot with. So they became known as... you guessed it...Single-Lens Reflex cameras.

About the Author
This article originally appeared in Alphatracks; the weblog for Sony and Minolta SLR enthusiasts. Visit the site for more articles by Tom Bonner. Tom Bonner is the author of the Sony Alpha DSLR-A300/A350 Digital Field Guide, published by Wiley Publishing. A photographer for more than three decades, he offers photography and web design services to clients in the Charlotte, NC are

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