The Interfit S1a AC, HSS & TTL Flash is the AC-powered counterpart to the award-winning S1 and contains all of the same intelligent TTL and HSS technology.
UNIVERSAL MANUAL REMOTE BACKDATE 2.6
If you have purchased the S1a with the Universal Manual Remote (INTR1B) you will need to backdate your S1 head to 2.6 for your remote to work. This is because we now ship the flash heads with the latest software 2.7 which is incompatible with the Manual Remotes. firmware can be downloaded from the download tab above.
|Maximum Watt -Seconds||500Ws|
|Power Range||9 Stops (2.0 – 10.0)|
|Full Power Recycle Time||2 Seconds|
|Flash Duration||1/1000 – 1/16,000 (max-min power)|
|Colour Temperature||5700K +/- 100K|
|Fitting Type||Bowens® / S-Type|
|Modelling Lamp||10W LED|
|Triggering||Interfit TTL-C/N/S 2.4GHz Remote, Sync Port, IR/Optical|
|Shooting Modes||Manual, TTL (Canon, Nikon, Sony), HSS|
|Maximum Flash Sync Speed||1/250sec. in normal sync mode, 1/8000sec. in high speed sync mode|
|Operating Voltage||220-230VAC or 110-120VAC|
|Auto Power Dump||Yes|
|Flash Ready Indicator||LED and switchable audible|
|Dimensions||32 x 13cm (12.6 x 5.1″)|
|Weight||Kg 2.25Kg (4.9lb) Kg|
|In the Box||1x - S1a Flash Head, 1x - 18cm (7") Reflector - with Bowens® S-Mount, 1x - 4m (13') Power Cable, 1x - Micro-USB Cable, 1x - Sync Cable|
Please ensure that you are on the same channel (this will be the number eg. 1a) on both the light and the trigger, as well as ensuring both the light and the trigger are up to date with your camera model. You can find firmware here.
Please ensure your camera hot shoe settings are correct, please refer to your camera user manual.
If you think you have updated your firmware and it doesn’t suit your older camera type, please contact us for backdated firmware files – you must have a Dropbox/Google drive account to enable us to send them.
Simply set up the lights on the same channel, then set the group to a different setting, from here you can control individual lights. For example, one [light] can be on 1A at 4.5 and another [light] can be on 1B at 5.0 – as long as they are on the same channel they will fire at the same time with different settings.
Please see this video on how to change the flash tube.
Yes! All our Interfit flash range will have optical sync which will enable your flash to be triggered by another light source, simply set the mode to CELL and your [HB320/HBU250/INTS1/INTS1A] will be fired by another light. Cell mode works on the speed of light, for best results use a direct line. Please note, on this mode you cannot control HSS or TTL.
With the sync cable that comes with the [HB320/HBU250/INTS1/INTS1A] plug it directly into the PC Sync Socket on your camera. Entry-level cameras do not have these, but you can buy an adapter. Like cell mode, you will not be able to control HSS or TTL using this method to fire the lights.
Check that the hotshoe settings on your camera are set up correctly, refer to your camera’s user manual.
Please also make sure all contact points on both the camera and trigger are clean and are not damaged.
We cannot guarantee any third-party equipment will work with our Interfit lights as they would not have been tested. If they do work, it is not guaranteed that you will be able to control HSS and TTL functions with them.
Yes, but like with any socket do not overload the extension lead and make sure it is a properly rated, surge protected extension lead.
Yes you can use your [HB320/HBU250/INTS1/INTS1A/Monolight/F121] in Europe.
Please ensure that both the light and the trigger are up to date with your camera model. You can find firmware here. You could be over firing the flash, the higher the setting of the light intensity, the longer the flash tube will take to recharge.
Please ensure that both the light and the trigger are up to date with your camera model. You can find firmware here. Your flash tube may have reached the end of its lifespan, you may need to purchase a replacement. Please also ensure that the flash tube is installed correctly - see this video on how to change the flash tube.
Making a Purchase
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