I am looking for cheap external flash for my wildlife camera trap (Canon EOS 40D). I got cheap Metz 44 AF-1 But unfortunately- it has built in power-safe function which can not be disabled in Manual/TTL mode (only by waking the flash and camera every X minutes which will drain the camera battery quickly).
I am now looking for an older Canon SpeedLite flash, where power-saving function can be disabled and flash will be continuously ready for triggering. My question is: does somebody have any experience, how long the batteries in flash will last until fully drained in such "constantly ready" operation? E.g. in Canon SpeedLite 430 EX, but I have no idea if there are some model-specific differences. Are we talking about hours, days, or weeks?
The only think I was able to test with my current Metz is to set it to Slave mode (power-saving disabled). It lasted over 2 days, but I am not sure if this is comparable with manual/TTL operation. Thanks.