The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.

f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。

youdao

Shall we stop down the lens?

我们要不要把光圈缩小一点?。

youdao

Because this is all manual, if you set anything other than the widest aperture on your lens it will stop down and the image on the screen will darken.

因为这是一切手动，如果你设置什么比你的镜头上停止下来，它会在屏幕上的图像将变暗，最宽光圈值等。

youdao

Other adapters can do some of that, but its final trick is the piece de resistance: increasing the speed of a lens by a full stop.

ENGADGET

Runco's cutting edge sward didn't stop there as they have this new projector screen-mask that when paired with the proper equipment and lens on Runco projectors can display any aspect ratio.

ENGADGET: Runco @ CEDIA - 1080p projectors HD