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Enlarging Lenses
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Your preferences are the best guides for you to find the perfect prescription glasses and lenses for your needs. You could make your own decisions about the various lenses, which are accessible to you when purchasing prescription glasses. You could probably start by considering your lifestyle, and thinking about when and how you going to use it. Then, it is must to read about prescription lens features, options, and other services that are offered. After which you would be able to choose from the menu of prescription lens options the features, which would most support your lifestyle.

Types of prescription eyewear lens

Single vision lenses

Your eyes might require vision improvement only for distance, only for reading purpose, or even for both. If you require correction only for distance vision, then you probably only want single vision lenses. With single vision lenses, you could look through all areas of the lens and it is visible clearly. If you desire vision improvement only for reading and in case you do not have astigmatism, then you could even purchase non-prescription reading glasses. If you do have astigmatism, you should go for prescription reading glasses. In either case, these are only considered single vision lenses.

Progressive lenses

Progressive lenses are sometimes as well recognizedas no-line bifocals, which are in fact trifocal lenses without the visible lines. Progressive lenses were urbanized as many people required the convenience of not having to change their prescription glasses for reading purpose, but they did not like other people to see the visible line. Progressive lenses do have an additional benefit however, which is that you sense a soft transition when you move your eyes from far away objects to close up objects. With a lined bifocal, the transition among viewing areas could even be somewhat uncomfortable.

Multifocal lenses

If you require vision adjustment for both distance and for reading purpose, then you could use two pairs of glasses, and swap depending on what you require to see. Or, you could even choose multifocal lenses (bifocal lenses, trifocal lenses, or progressive lenses). Many people find it not convenient to swap every now and then to another pair in order to read something.

Multifocal lenses divide the lens, so that part of the lens is kept for reading and another part of the lens is kept for distance vision. Bifocal (two areas) and trifocal (three areas) lenses have visible lines, which separate the diverse areas of the lens.

Prescription reading glasses

Non-prescription reading glasses just enlarge objects that are close to us, like the letters in a book. Your eye doctor could only decide the magnification power, which is most excellent for you, or you could figure it out by yourself through test and error. A doctor's prescription is not sometime necessary in order to choose a reading lens. Drugstore reading glasses are just eyeglasses frames with enlarging lenses pre-loaded in a range of powers with stock lens powers. It is typically less costly to buy reading eyeglasses this way, but stock lens powers hardly ever offer an optimal vision correction. For best results, reading lenses with magnification customized to your requirements could be installed in any pair of eyeglasses frames.

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The Interesting History Of Glasses: How Bacon Invented Them

In the mid of the thirteenth century, the great English scholar Kevin Bacon found that a lot of people suffered a lot from not being able to see clearly the words and characters on books because of the poor eyesight. And it occurred to him one day to invent a tool to help people improve their eyesight. However despite the great effort he made doing experiments, the idea never panned out.

One day after rain, Bacon was taking a stroll in the garden when he saw some raindrops sticking to a spider web. Looking through the raindrops, he found to his excitement that the veins had been enlarged. Immediately he ran back home and searched throughout the house for a glass bead. But behind the glass bead the words on the paper were still vague. So he cut a piece down from the glass bead using a diamond and a hammer. Putting the piece of glass near the paper, the words were really enlarged! It was successful and Bacon almost thrilled. Later he found a chip of wood, pierced a round hole in it, put the glass bead in and equipped it with a handle. With this it was more convenient for people to read and write. It is what we call today eyeglasses.

The lenses of the glasses were improved again and again and eventually developed into the kind people wear today. And there are a several kinds: glasses for nearsightedness, presbyopia lenses and so on. It can be said a great contribution that Bacon made for the human society.

However it is generally believed that glasses first appeared in Firenze, Italy and they were first made an Italian in the city of Pizza. In 1825, an English astronomer invented the glasses that could correct astigmatism. There is not much record about the origin of glasses in China but someone say that they showed up in the mid of Ming Dynasty because it has been observed in a picture preserved since that time an old man with spectacles. And in the Qing Dynasty glasses were already well spread.

About the Author

Glasses Shop provides a great variety of discount glasses with high quality and fashionable designs. What's more, you can try all glasses on line and all your purchases are promised to free of risk. And now many prescription glasses and sunglasses with latest designs have arrived, so when you want to send your families or friends some gifts,don't forget to buy them one. If any of you have questions, please leave your suggestions in comment section.

what is the maximum size print i can get with my canon 5.1 MP DSLR?

hi guys, i have canon 300d, with 5.1 MP DSLR, what is the maximum size of print i can get with this camera without fading the pixels,

and is there any other way (photoshop etc..) to enlarge a photo without loosing the quality? if yes then how?

does it matter what lens i am using with DSLR when enlarging the picture?if yes then how please explain

thanks in advance

you probably could go however big you intend to print your photo, despite the low mp count. DSLR pixels are bigger then the pixels on regular digital cameras. I would definetly keep asking around, maybe find a few pro photographer's websites and email them. In my opinion, you probably shouldn't push it too far past 11x14 in

when enlarging photos, you will pretty much always loose quality to some degree, no matter what program you use. I would shoot in raw, so that the photo is uncompressed. You won't be able to take as many photos, once you get ready to print that should help cut down any loss in quality after enlargement(you'll still have to compress the photo via photoshop,etc... before printing, but at least, in this stage you will have more control over how it happens). Also, like one of the previous posters mentioned, if you use something like photoshop, you can adjust the resolution to help compensate for any loss, though this could mess up how large you originally intended to enlarge the photo. The higher the resolution you set, the bigger the picture will get(more pixels = bigger picture) im not sure of the math involved but you could enlarge the picture through this method too, however the more resolution added, the bigger the file is gonna get.

the lens, on a technical level, does not influence enlarging photos. However, there could be different situations where it could certainly play a factor, for instance say you were taking pictures at an indoor sports game. If you have a low-speed lens(where the min. aperture setting is 4 +) , then you would have to crank up the ISO speed(camera's sensitivity to light) higher to compensate for the lack of adequate lighting. If you set the ISO too high, you will see grain(which can be good or bad depending on your artistic preference) in your photos. Once you try and enlarge, the effect could become more pronounced.

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