photo sharing and upload picture albums photo forums search pictures popular photos photography help login
fotoopa | all galleries >> laser_system > Part 14
previous | next
Part 14

Part 14

The camera is no longer able to do any light metering because the lens contacts can no longer be attached through the Compur shutter. Also, the lens diaphragm can no longer be controlled through the camera. Now we have to set everything manually just like in the good old days. However, with a digital camera where you can see the results directly, this is no problem. The AF200/4D micro has a diaphragm ring for manual setting. The adjustment is less fine, 1 click per stop, but for our purposes this is good enough. After all, we are working with a fixed distance and a fixed lighting. The lens has to be adjusted in advance. The Compur shutter is normally closed so you can no longer look through the viewer. Since we are using a system of laser detection, this is not a problem. Once the lens is manually adjusted, we switch the lens from manual to auto-focus, but the camera stays manual. This locks down the lens, which can no longer be turned with the focus ring. That way we can be certain that the adjustment with respect to the lasers will not shift in the field and that focus will be maintained. For setting the lens, the operation module must be able to keep the Compur shutter open. Here is a shot showing how the shutter is positioned on the lens.


other sizes: small medium original
share
Commenting on this page requires a PBase account.
Please login or register.