Thanks for visiting our site!
Lens Lens
Checkout Ebay Auctions For The Cheapest Prices
 |
 Hoyalux Summit ECP 1.50 Trans Next Gen Gray Lens lot  US $54.00
|
 Hoyalux Summit CDX Short Trivex Trans V Gray HC 5B Lens Lot US $360.00
|
 Mitutoyo m plan Apo 2x.0.55 -0 f =200- objetive len US $260.00
|
 TRIAL LENS SET 68LE NEW!!! WITH NEGATIVE CYLINDER PERIMETER US $177.50
|
 whelen 900 series clear strobe lenses US $12.00
|
 whelen 900 series red in color, lense only no light head US $7.00
|
 New Auto IRIS 5 ~ 100 mm CS Mount cctv lens US $34.99
|
 New Auto IRIS 6 ~ 15 mm cctv lens US $14.49
|
 RADIUS TOOLS -Delrin Material-CONTACT LENS MODIFICATION-Full Base Curves-EXTRAS US $80.00
|
 Nikon 10x E Plan Eplan Objective 10 0.25 Lens Microscope US $120.00
|
 Nikon 100x E Plan 100 1.25 NA EPlan Microscope objective lens US $120.00
|
| Powered by phpBay Pro |
Also Checkout Amazon For Related Products:
 |
50mm Circular Welding Lens, Green IR Shade 14 Sale Price: $4.99  |
|
These are standard-sized green welding lenses for use in standard welding goggles. Sold by the lens. Made of the highest quality Schott German glass. You will not find the typical striations, bubbles, and other defects commonly found in Chinese glass lenses in these lenses. |
 |
4.5" x 5.25" Green Welding Lens Shade 14 Sale Price: $6.99 |
|
These are standard-sized green welding lenses for use in standard welding helmets. Made of the highest quality Schott German glass. You will not find the typical striations, bubbles, and other defects commonly found in Chinese glass lenses in these lenses. |
 |
SE Folding Pocket Magnifier, 6X 2.5" Glass Lens List Price: $2.24 Sale Price: $1.98 |
|
2½ in. Dia Lens, Power 6X, Glass Lens. |
 |
Bausch and Lomb 813376 2X Rectangular Handheld Magnifier with Acrylic Lens, 2-Inch by 4-Inch List Price: $18.15 Sale Price: $12.03 |
|
Premium magnifier featuring stabilizing edge for two-hand positioning, molded to fit your hand with ErgoTouch grip, extra-wide field of vision. Rectangle magnifier features a 2X magnification lens. Provides both a quality and comfortable magnifier. |
 |
2" x 4.25" Green Welding Lens Shade 14 Sale Price: $4.99 |
|
These are standard-sized green welding lenses for use in standard welding helmets. Made of the highest quality Schott German glass. You will not find the typical striations, bubbles, and other defects commonly found in Chinese glass lenses in these lenses. |
 |
Donegan LP 5 Replacement Lens for Opti-Visor, 2.5x Magnification, 5 Diopers, 8" Focal Length List Price: $37.74 Sale Price: $24.71 |
|
The Donegan replacement lens plate for the OptiVISOR hands-free, headband binocular magnifier, has an optical-grade, acrylic lens ground and polished into a prismatic lens, and is available in multiple dioptric strengths which provide specific magnification power (X) at specified focal lengths, or distance from object. This magnifier enhances the size and resolution of an object or image, and is commonly used for a variety of applications such as jewelry-making, watch-making, knitting, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting. Determining Magnification Diopter Magnification Focal Length (Distance from Object) Sample View 20/20 vision 20" (50.8cm) 2-diopter lens 1.50X 20" (50.8cm) 3-diopter lens 1.75X 14" (35.56cm) 4-diopter lens 2.00X 10" (25.4cm) 5-diopter lens 2.50X 8" (20.32cm) 7-diopter lens 2.75X 6" (15.24cm) 10-diopter lens 3.50X 4" (10.16cm) The OptiVISOR replacement lens plate is made of a durable plastic material. It is constructed to interchange in and out of the OptiVISOR body with ease. The replacement lens plate comes housed in a protective carrying case, and has a one-year limited warranty. Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8”). The higher the diopter, the more magnification a lens can provide. As magnification increases, distance to the object (focal length), and field of view (diameter, or narrowness of view) decrease. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric strength of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to calculate total magnification. Magnifiers are devices used to enlarge the visual appearance of an object or image. Magnifiers come in a variety of styles such as hand-held, headband, standing, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier ability is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the object will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focal length decrease. Magnifiers sometimes have a diopter number, expressed as + or - D, which is a measurement of strength (or power) of the lens. Some magnifiers are marked with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter number. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the edge of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, watch-making, electronic inspection, needlework, artwork, reading, print inspection, and stamp-collecting. Donegan Optical manufactures and distributes precision visual devices for hobbyists and professionals in industry, home, office and crafts applications. The company was founded in 1952 and is headquartered in Lenexa, Kansas. What’s in the Box? Replacement lens plate for OptiVISOR magnifier Fitted carrying case Instruction manual |
|
4.5" x 5.25" Green Welding Lens Shade 10 Sale Price: $5.99 |
|
These are standard-sized green welding lenses for use in standard welding helmets. Made of the highest quality Schott German glass. You will not find the typical striations, bubbles, and other defects commonly found in Chinese glass lenses in these lenses. |
 |
US Forge 105 Clear Cover Plate Welding Lens 4-1/2-Inch by 5-1/4-Inch List Price: $2.69 Sale Price: $1.71 |
|
Can be inserted directly in front of shaded lens on each helmet type. Use to protect lenses from molten metal spatter, general scratching and wear. |
 |
Miller 216326 Elite Front Lens Cover Pkg = 5 List Price: $8.82 Sale Price: $8.75 |
|
Package of 5 outside lens to replace the Miller Electric # 216326Front lens cover for Elite series Miller auto darkening welding helmets.Package of 5 Mfg by Weldcote Metals and not affiliated with Miller Electric |
 |
2" x 4.25" Clear Magnifying Welding Lens, +1.50 Sale Price: $5.49 |
|
These are standard-sized clear acrylic magnifying lenses for use in standard welding helmets. Made of the highest quality clear acrylic. These lenses are for use in combination with a green welding lens. |
Here are some more information for Lens Lens:
If you have thought about doing portraits with your Canon EOS digital SLR camera, you are not alone. Portraiture may be the most popular photography applications pursued by amateurs and pros alike.
You might be surprised to know that having the perfect Canon portrait lens is not the most critical part of getting a great portrait. But a good lens will definitely go a long way toward getting you to that great image.
Being a portrait photographer can truly be a pretty glamorous career. If you get good at it, you could be photographing the very famous people. And you would be dong it in a very different way than the paparazzi, who are not very well thought of in the photography business. Besides, what they do is not portrait photography.
Most portrait photographers are not shooting famous people though. There is plenty of work in the field that does not include actors, singers, and other glitzy individuals.
There is the individual portrait opportunity, family portraits, high school senior photos, babies, and even pet portraits. So there is no shortage of opportunities.
Depth Of Field - Your #1 Goal
As a portrait photographer, the portrait lens is as important as the camera you attach it to. You will want your portraits to have certain qualities that make the model or subject a very special part of the picture. The first thing you want is a narrow depth of field. This means that the plane of focus is shallow, putting the other objects in the photograph out of focus. This brings the viewer's eyes right to the subject.
Great portrait lenses accomplish this shallow depth of field by allowing the picture to be taken with a very quick shutter speed. This is accomplished by having a wide aperture, usually f/2.8 or wider. In fact, the better lenses have apertures as wide as f/1.2. The result of using a wide aperture is that you get a depth of field that is far more sleek and sexy. Your subject will love their picture (and you). And you will feel like you accomplished a portrait that could go head to head against the pros.
What Focal Length?
Another feature you will want as a portrait photo shooter is the right focal length lens. The majority of photographers who do portrait work use a single or prime focal length, meaning the lens does not zoom at all. You can employ a lens that has a 50mm length, but that is the absolute shortest that you should use. Any shorter and you have to get too close to your subject. A better focal length is somewhere between 75mm and 150mm. This gives the photographer a better combination of depth of field, distance from the subject, and flexibility in choosing the perspective.
Using a lens that is too short will create unpleasant facial feature exaggerations, like the ears will be too large for the head. Everyone has seen those images of the cows where the cow's nose looks way out of proportion when compared to the rest of the animal. That is done on purpose, of course, using a wide angle lens (less than 50mm) and getting too close to the subject. It's a humorous shot, but not one that a high school senior would appreciate in their final yearbook.
There are also lots of photographers who use zoom lenses for portraits. One of the most popular is the Canon 70-200 f/2.8 zoom lens. You can imagine how much flexibility a lens like that will give you as you set up your shot.
The good news is that just about any lens can double as a portrait lens. If you know how to pull it off, you can take great portraits with you cell phone.
A Little Trick To Get Better Backgrounds
Depth of field has been mentioned as one of the things that can make your portrait special. A trick you can try is to move your model or subject farther away from the background. In other words, put as much distance as you can between the model and the background. This will put the background out of focus and compensate for the lack of a wide aperture.
Most of your friends and family think that you can take great portraits if you own a Digital SLR camera. Truth is, you can. But if you want to do even better, get yourself a great portrait lens.
While buying a great portrait lens is not first on everyone's do-to list, you should know which lenses take the best portraits so that when the occasion arises, you will know which lens to pull out of your camera bag. It can also be part of the selection process when you are buying your next lens, because getting a lens that can double up as a Canon portrait lens is a great advantage financially.
The best lenses, especially Canon lenses, are featured at www.CanonEOSLenses.org.
How Best To Go About Choosing Your Digital Video Camera Zoom Lens
Okay, so you finally decided to get that digital video camera you've been saving for. You have enough money to buy a kick-butt video camera. But have you considered the most vital part for the camera? The part that comes into play with every video shot. The digital video camera zoom lens. Without a proper digital video camera zoom lens, your prized video camera isn't all it could be. You would be much better off if you spend equal amounts on the camera and the digital video camera zoom lens. The lens is that important. Your choice of lenses can distinguish between a good camera and an outstanding camera.
Spend More On The Lens
The digital video camera zoom lens determines how well your videos turn out. It, more than anything else on or in the camera affects the end products. Think about it, every shot you take goes through that lens. Really the camera is just a case for the mechanisms inside. You could make a case for reversing the spending, more on the lens and less on the actual camera. Most digital video cameras don't come with the ability to change lenses. This fact makes it more important to purchase the best digital video camera zoom lens possible. Another piece of advice regarding the lens is too not purchase the plastic lenses. The clarity is much better from glass digital video camera zoom lens.
If you do plan on purchasing a video camera where you can change the digital video camera zoom lens then compare the options of each lens to find the one that you want. Experts recommend that you purchase brand names such as Canon, Pentax or Nikon. Be sure to check if the lens will work for your camera. Digital video camera zoom lenses are not created equal and a lens from Nikon may or may not work with a digital video camera made by Canon.
If you are a professional photographer, then you should check out Leica, Carl Zeiss and Leupold. These are specialty lens manufacturers. The quality of the videos will show if you use one of their digital video camera zoom lens. If you are just a beginner then these lenses may not be the best place to start, because of the cost. But if you want extraordinary quality, these digital video camera zoom lenses are the way to go.
Options for digital video camera zoom lenses include normal, wide angle and telephoto. The focal length of the lens has a lot to do with the type of digital video camera zoom lens choice. The quality of the lens is also determined by lens speed, a significant factor in your shoot quality. You should think about focusing distance as well as advanced features such as vibration reduction, USM or ultrasonic motor and filter thread which should be present in any good digital video camera zoom lens.
Before you make that digital video camera zoom lens purchase you should research each feature that you want and choose the lens that fulfils those wishes the best. As a rule of thumb, the more expensive lenses are usually the better choice since more of the elements in the lens with be glass, although this does increase the camera weight. In the end if you do the research and take into consideration your shooting needs and budget, you will make the right choice
About the Author
Ready, shoot, action
Ken Glauser
What is the height of the image formed by the new lens?
Now replace the lens used in Part A with another lens. The new lens is a diverging lens whose focal points are at the same distance from the lens as the focal points of the first lens. If the object is 5.00cm high, what is the height of the image formed by the new lens? The object is still located 29.0cm from the lens.
(Part A was) An object is located 29.0 from a certain lens. The lens forms a real image that is twice as high as the object. and i solved the focal lens length to be 19.3cm
OK, so now the focal length is -19.3 cm.
Use the thin lens equation (ref.):
1/f = 1/do+1/di ==> di = 1/(1/f-1/do) (be sure to use the correct signs!)
solve for di; then si = -so*di/do
A view through his lens
When Pulitzer Prize-winning photojournalist David Hume Kennerly looks back on nearly 50 years of peering at the world through a camera lens, his favorite frame is of Barack and Michelle Obama on inauguration night.
Thanks for visiting!
