Post by belgiumreporter on Feb 18, 2020 10:40:01 GMT -5
The Canon booster (maybe it should be called light metering booster) is by today's standards an odd looking camera accesoire. Back in the day when slr's didn't had a build in meter it wasn't uncommon camera makers made clip on lightmeters wich fitted on top of the camera. In a later stage slr's became equipped with build in metering. Canon however, decided to take it a step futher by introducing the "booster" wich extended the metering range of the build in meter dramaticly. It was made for use on the Ftb and the later version of the pellix. The main advantage of this device (apart from the extended metering range) is it's coupled to the internal meter (via a plug wich fits in a socket inside the battery chamber) making it a ttl meter. This in some cases could give an advantage over a hand held meter.
However... the booster isn't coupled to the shutter dial and readings aren't visble in the view finder wich makes the device rather fiddely to use.
Some tech specs: metering range is extended to EV11 1/2sec. at f22 and EV -3.5 15 seconds at f1.2 (100ASA). there's two battery chambers for type 625 mercury cells one for the metering the other for illumination of the dial.
Little info is to be found on the booster, even the canon museum doesn't mention it, wich doesn't mean it's a rare item. Still i'm glad i've found one as it's a nice piece of vintage inginuity wich overcame some of the problems in early slr photography.
However... the booster isn't coupled to the shutter dial and readings aren't visble in the view finder wich makes the device rather fiddely to use.
Some tech specs: metering range is extended to EV11 1/2sec. at f22 and EV -3.5 15 seconds at f1.2 (100ASA). there's two battery chambers for type 625 mercury cells one for the metering the other for illumination of the dial.
Little info is to be found on the booster, even the canon museum doesn't mention it, wich doesn't mean it's a rare item. Still i'm glad i've found one as it's a nice piece of vintage inginuity wich overcame some of the problems in early slr photography.