OT camera question

[Monte55]

Is anyone here well versed on DSLR cameras. I am trying to use a wireless flash transmitter on a Canon T2i to control a flash off camera attatched to a wireless receiver

[Hotfoot]

Is anyone here well versed on DSLR cameras. I am trying to use a wireless flash transmitter on a Canon T2i to control a flash off camera attached to a wireless receiver

I am not, but am curious. I see "DSLR" used as a camera description, and I understand that to be "Digital Single Lens Reflex". In the film days, a mirror was in position to view through the lens, and the "reflex" came about as the mirror flipped up to allow the 'scene' to pass directly to the film, held across the rear of the camera.

I believe the "reflex" could also refer to the light bending from the lens to the mirror to the viewing prism....but in either case, does the DSLR still use a mirror system, so you are "physically" looking through the lens as you view, or is it all done electronically (digitally) now,,,and if so...Where's the reflex?

Many Thanks!

[Monte55]

They have the mirror the same as the film cameras. The mirror has to flip up out of the way to expose the sensor just as in film and then flip back down to see through the viewfinder and actually view through the lens.

[billbong]

Hi, one of the guys at our club had an off camera flash outfit coupled to a light sensor device.

When the camera flash fired, the remote sensor coupled to the off camera flash ,detected the light from the camera flash and fired the off camera flash gun.......the off camera flash gun and sensor were not connected to the camera, but were approx 20 feet away to give background fill in light.

I think you can get the off camera flash detectors on Ebay....don't know how much.
Ian.

[Monte55]

Those are fine as long as you are not around others firing off flash units plus the optical has to have a good view of the main flash. The radio ones do not need a main flash to fire

[Roger]

Camera trivia
Another type of SLR system uses stationary mirror to send a percent of light from lens to view finder with rest of the light light from lens to film. This system is not as common as the mirror that raises so focal plane shutter can expose film. This Light splitting mirror system was used in some motorized Nikon F 35MM cameras to get higher exposure rate.

Motion picture SLR cameras used mirrors on rotating shutter to send light from lens to view finder between film exposures. Standard frame rate was 24 frames per second with 1/50 of sec exposure. 24 fps produces a flickering image that can be seen by camera man so each mirror had narrow no reflective stripe so camera man saw flicker free 48 images a second. Motion picture film projectors also project each frame twice or 3 times to give flicker free viewing.

Most video cameras have small electronic view finder with rubber viewing adapter to give same affect as SLR camera.

Professional motion picture camera view finder lets camera man see subject a little outside of camera film frame. Pro video cameras also do this.

Early still cameras were focused and shot composed on ground glass then film was loaded and exposed. This is what photographer was doing with dark cloth over back of camera and his head. Early motion picture cameras did about same by uncovering view finder that let cameraman look at image on back of film. Experienced photographer doing this with still or mopic camera could accurately set expose while doing this by adjusting lens aperture. Modern unexposed films has opaque coating on back of film to improve image so you can not use motion picture film like ground glass focus aid.

[PJinNJ]

Not certain about Cannon but my Nikon system needs to be paired like a cell phone to the main unit then the wireless allows me to sync or fire any or all of the units.