DIY 投影机不得不知的现实常识(国外英文资料).docVIP

DIY 投影机不得不知的理论知识(国外英文资料) Lens is known to all, the importance of all the work finished, finally is to the lens of real expression comes out, the lens effect high price is not always better, it is suitable for DIY projection, basically see the matching degree of the lens and optical components, some people use the ultra short focal length lens, severe aberration results out of the picture, center the clear picture, picture still a blur, four edges of image edges will have pillow distortion, see after a long time, will feel a blinding. Other about lens aperture, and a good film to the plating problem has a direct impact on the cost of the lens, in all the lens are not necessarily the high price is good, the key is, and other optical components, including the sex of LCD. Mainly includes: 1. The lens is composed of polished glass, made of a sheet of glass is monolithic mirror, because of its grinding Angle is standardized, so the focal length is fixed, fail to adjust, and the prime one chip. 2. Three piece of glass is composed of three piece of glass, although each piece of glass in the focal length is fixed, but adjust the distance between the three piece of glass can make whole focal length changes, so formed a three adjustable focal lens, or three pieces of lens zoom. If the relative position of three pieces of glass is fixed and cannot be adjusted, its overall focal length is fixed, which is a fixed focus. A single piece of mirror is different from the three-piece mirror DIY: the three mirror image is clear, the corners are neat and neat; The image of a single piece of mirror image is clear, the image is in a form of a form of soliloquy, a bit of hazy, a little hazy, so it is not recommended to use a single piece of DIY projectors. 5. The difference between the zoom and fixed focus: commercially available products projector zoom function strong, a bit like a DV can be a wide range of the image size, but it is based are using small size LCD screen on the basis of. D