Lens Unit
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 New Ricoh GXR Camera body + A12 28mm F25 Lens unit kit $845.67 Time Remaining: 4d 2h 20m Buy It Now for only: $845.67 |
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 OPEN BOX UNIT Nikon J1 101 MP Digital Camera White Kit w VR 10 30mm Lens $330.35 (34 Bids) Time Remaining: 22h 42m |
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Lens Unit
Contact lens: Don't Buy It before Reading This
Many people believe that to choose the contact lens with high water cut will be better if eyes always feel dry. Actually, this opinion is totally wrong. According to the professtional peraon, the eyes will feel drier if wear the contact lens with high-water-cut.
It is safer to consult doctor before buying contact lens.
High water contact lenses have increased oxygen transmissibility, therefore, people could feel more comfortable after wearing them. But the higher water content contact leanses, the stronger water absorption. If the user with less tears did not supply water to the contact lens timely, they will absorb more tears on the surface of eyes to maintain moisture and eyes' dry symptoms will be more serious.
Lots of people used to buy contact lenses directly to the optical, but most contact lenses on the market are stressed the "high water content, high oxygen permeability". Most consumers are difficult to make right purchase base on the marks, and general optometrists in the opticals may be able to match a suitful degree, but they may be difficult to detect if the consumers eyes are more special. So to find the doctor is very important.
Soft or hard style, which is better?
We could often hear ophthalmologists recommend rigid contact lenses, but why most people in Taiwan still wear soft contact leanse? Soft or hard style, which is better? One of professional person said, it will be more comfortable to wear soft contact lenses for the first wear people, while hard contact lenses are likely to have foreign body sensation and it's hard to accept for eyes. Furthermore, the glasses of soft contact lenses are relatively simple, the lens curvature generally only have two or three options, but hard contact lens should be made base on the corneal curvature of user, so soft contact lenses accounts for much of market in Taiwan. However, in Europe and the United States, hard contact lenses are very common.
People will be afraid when heard of "hard" in contact lens, however, ophthalmologist think that hard style is superior to soft style, because soft contact lens could envelop the whole iris while hard contact lens which depend on the atmosphere press floating in tears on the surface of eyes just cover the cornea. In addition, hard contact lens have higher oxygen permeability than soft style and could not absorb the tears in eyes, so they are difficult to make eyes drier. What's more, its materials are easy to clean and the glasses are difficult to adhere to the residual protein. Therefore, if suffer from severe allergic conjunctivitis, or need to take a long time to wear contact lenses, doctors suggest use rigid contact lenses.
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For front projectors, should the unit or the lens be mounted center to the screen?
my projector doesn't have horizontal shift so it has to be mounted dead center
bbt91945, u didn't answer my question. should the UNIT or LENS be the centerline?
Yes, if you don't have any adjustment shift.
Ricoh GXR A12 28mm f2.8 lens unit