Why is the monitor lens rotten? Where is rotten?
The Small factory optical processing capacity is poor, especially without aspheric mirror, so only by reducing the aperture to improve the optical performance, the general Japanese lens in the usual focal length, little less than 1.6, the small factory or less 1.6 lens usually aperture than 2.0 To be small
Some people with the lens of the F signal to know the lens is good or bad? The The first time I heard that the lens is used to spread the distance or shrink the main distance or look at the monitoring of the CCD and this digital camera SLR is too big difference between the two is not a concept
This lens can be performed under strong light, poor performance in dark places. In the same pixel, usually the standard 1.4 lens than the 1.6 lens price difference more than twice.
General manufacturers of optical processing capacity, the aperture basically do 1.4 or more, such as the Japanese manufacturers Tenglong, Fujitsu, domestic Phoenix has a 1.0 aperture lens.
