"aaa" <aaa@aaa.lt> escribió en el mensaje de noticias 
news:kd6ud6$ceq$1@trimpas.omnitel.net...
> http://www.metabones.com/info/105-info/154-speed-booster
> Didesniam freimui skirtus objektyvus padaro šviesesnius skirtus mažesniam 
> freimui, t.y. galima pereiti į visai kitą kokybės/kainos klasę. Giriasi 
> kad iki jų dar niekas iki to nedasigalvojo.


http://en.wikipedia.org/wiki/Nikon_E_series

"Optical system
The E series uses a unique additional optical system that enables the small 
sensor to capture the field of view of a 35mm film, with a crop factor of 1. 
This comes not at the expense of the lightness of the lenses, because the 
light is bundled to the 2⁄3 inch CCD sensor with approximately 1⁄16 smaller 
area. The result is approximately 4 stops (24 = 16) more light at the small 
sensor compared to a full-frame sensor. Therefore the camera has a minimum 
full-frame sensitivity of ISO 800 which is equivalent to ISO 50 at 2⁄3 inch. 
As a result the noise of the camera at ISO 800 full-frame is equivalent to 
ISO 50 of the 2⁄3 inch CCD sensor. Nikon could not reduce sensitivity below 
800 ISO full-frame, because the little sensor will be overexposed below 50 
ISO.
The exceptional high sensitivity up to 3200 ISO (equivalent 200 ISO, 2⁄3 
inch) can be seen as an advantage for indoor or available light photography 
and is important for professional press and sports use, the customer target 
area. Although the camera is small for a 90s DSLR, the additional optical 
system makes the camera deeper compared to today's DSLRs.
Standard Nikon F-mount lenses can be used."