Focus Lens
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Bifocal Contact Lens
For a majority of us, presbyopia is something we have to live with. In definition, presbyopia is the lack of focusing on things in close range. The cause for this, is the lens in our eyes becoming less and less flexible as we grow older. The bad part is, most of us will need some type of corrective lenses, such as contact lenses or glasses and possibly even bifocals at some point in our lives as this condition gets worse.
Up until recently, those who wore bifocals had very limited options when they chose their corrective lenses. Years ago, glasses that contained bifocal lenses were just about the only option available. Over the years, no-line lenses were created, and glasses became a bit more attractive. This was a very definitive time for bifocal correction lenses, as they looked a lot better than they ever did in the past - eliminating the bulky and unattractive appearance they were well known for.
Now days, you can find many different types of bifocal contact lenses on the market. They are gaining in popularity, as they give those who wear bifocal glasses a very attractive alternative to wearing bulky glasses. They are very affordable as well - which makes them a more popular choice in the world of corrective lenses.
What many may not realize, is the fact that bifocal contacts are very similar to glass lenses in the way they work. With glass lenses, each separate lens provides a range of focus adjustments, one for distance and another for being close up on something. With bifocal contact lenses, both of the adjustments are included. There are different manufacturers that produce different types of bifocal contact lenses, meaning that it may take you a bit of research and experimenting to find which type works the best for you.
Some contact lens however, are made with a unique design, known as concentric. Similar to concentric circles, there are two adjustments - one in the middle the other around the outside. These two adjustments in the contact lens are very distinct, with a sharp line between them. Even though they may sound hard to use, most people find that they are easy use with a little bit of practice.
how much money can i get for a Nikkor 300mm - H manual focus lens?
I have a Nikkor 300mm fixed lens.. the aperature is 4.8
KEH has one in excellent condition for $165.
I have seen them sell on eBay for $105 with case. Photo.net has one for $110.
New SLR Magic HyperPrime 12mm F1.6 unveiled (cnet)
The Chinese lens maker has just announced its latest fast wide-angle prime for
Micro Four Thirds cameras. SLR Magic's HyoerPrime 12mm F1.6 (Credit: 3D-
Kraft)SLR Magic has just announced a new addition to its Micro Four Thirds
lens lineup with its latest HyperPrime 12mm F1.6 lens. Sporting a black
anodized metal finish, the lens features three Tantalum glass elements which
the company claims can improve optical performance. The 12mm is able to focus
as near as 0.15m and comes with a 12-bladed aperture mechanism--which closes
down to a full circle when stopped down, which should help give better
bokeh.Given the Micro Four Thirds 2x crop factor, the new lens' focal length
translates to 24mm (35mm equivalent) which makes this a wide-angle prime lens.
Coupled with bright F1.6 lens optics, we think this lens would be great for
those looking to capture image--without a flash--in low-light conditions.
Also, its wide aperture makes it great for experimenting with depth-of-field.
Users can blur out distracting backgrounds while keeping their subjects in
crisp focus.The SLR Magic HyperPrime 12mm F1.6 will be available worldwide and
is slated to hit retail at the end of November 2011.
Manual Focus Lens Review
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