at the shop. I understand a little bit more about flash trigger and hence is looking around. It seems like the frequency and power rating of the flash trigger plays a very important part in the performance of a flash trigger.
2.4GHz is the best frequency option. The respond of the trigger is the fastest ( because it is operating in the radio frequency range ). There will not be any time lag in the trigger.
If you are not using 2.4GHz, then the respond of the flash trigger will slow down as your firing distance is getting further and further away from the camera.
.. hope bbbutties don't mind, but being a technical person, I have taken a look at my remote flash kit and realized that they are;
Frequency - FM 433 MHz
Sync Speed - 1/500 sec a range of 30 meters.
From that itself, I don't see how it will hinder normal usage. Even with the flash mounted on the hotshoe (direct transmission), we can't shoot above 1/250 as I remember experiencing a dark band at the bottom of the image trying at 1/320 shuttle speed. Hence I conclude the limitation lies more with shuttle operation (lag) and not the transmission speed.
During the tEachEr shoot, I did a couple of test shots when switching over to the Beast™ to determine both exposure and possible sync speed. I just converted the RAW and resize it as below;
Can't read the full EXIF but remembered shooting between f/8 ~ f/16, however the shuttle speed still register. The upper one is 1/200 while the bottom one is 1/400. The dark area at the bottom isn't much heavier than previous experience with 1/320, hence I am confident that even operating at 433 MHz, it will be really good enough.
In accordance IEEE, higher Hz mainly equates to bigger payload and longer range rather than speed. In a simple device such as the remote trigger (singular function encompassing dry contact mainly), I don't really think the higher Hz counts, even if TTL function is build in. Most broadcast are utilising VHF and UHF anyway, i.e. < 900 Mhz.
2.4 GHz as I read were the standard set by IEEE code 802 for data transmission in the medium to long range, hence most of our devices/broadband/computer related stuff are operating on a section of this code namely 802.11b and 802.11g. It is about 2 stops above the VHF I think classified as the "S" band if I'm not mistaken.
Infact, research has found that 2.4 GHz transmission are most prone to electromagnetic inteferences after it was implemented and gained widespread usage. Our data phones are using this frequency btw. see link below
Hi-spec may not always works better depends on the scale of applications. Hence fibre-optics didn't quite took off for domestic purposes. Despite it higher speed compare to electrical signal, the gain in low range usage doesn't justify due to data modulation and de-modulation are done in electrical speed. Over long range, they have advantage as electrical signal deminishes over distances and required more intermediate boosting.