[xavierdc]

http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/FZ-10/Lens/Lens-Hood.html我看該網址時發硫我兩個問題,但我技術有限唔多明.
有無人可指教下?
引文:

this lens hood has two major problems. First, while the lens hood is wide enough for the wide angle end, it is not deep enough for the telephoto end. In other word, when the lens is zoomed all the way in to 420mm, the angle of view is about 6 degree and the lens hood angle of view is much larger than 6 degree. This means stray light can have a chance to easily strike the lens front element, producing lens flare and/or ghost images. To better shield the lens at the telephoto end, a deeper lens hood is needed. Second, the Panasonic way of suggesting to mount filters on the lens hood could be a bad idea. The FZ-10 lens can focus down to about 2cm at the wide angle end, which is about the same depth from the front glass element of the lens to the filter. Hence, if there are some higher contrast stuffs (e.g., deeper scratch) on the filter, it is likely that the lens may focus on the filter! Moreover, internal reflection among the front glass element, lens barrel and the inner surface of the filter may also produce lens flare. The following image shows a good example. The lens focuses on the dust and scratches of the filter, and you can see clearly the image of the lens barrel (left side of the image). Of course, it was staged to show the problems. In daily shooting this is unlikely to happen.

他有解決方法,不過都唔明????