This product is either directly despatched from our supplier or is produced to order. Whilst we will pre authorise your credit or debit card at the point of ordering, no payment will be taken for this item until we have contacted you to confirm that we are in a position to despatch the product. If you require further information we recommend that you contact one of our Customer Service representatives on 01603 486413.
The Interfit S1a is an affordable 500Ws, AC powered monolight with high speed sync and TTL for Canon and Nikon cameras. This unit is designed primarily for use in studio or for photographers who have already invested in external power packs with sine wave inverters. Slightly smaller than the S1, the S1a works seamlessly with its battery-powered counterpart at a 40% lower price point. More
Interfit S1a TTL and HSS Flash
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The Interfit S1a is an affordable 500Ws, AC powered monolight with high speed sync and TTL for Canon and Nikon cameras. This unit is designed primarily for use in studio or for photographers who have already invested in external power packs with sine wave inverters. Slightly smaller than the S1, the S1a works seamlessly with its battery-powered counterpart at a 40% lower price point.
The Interfit S1a HSS TTL Flash (INTS1a), AC only includes:
1 - S1a Flash Head
1 - 18cm (7") Standard Reflector - with Bowens S-Mount
1 - 13' (4m) Power Cable
1 - Micro-USB Cable
1 - Sync Cable
The S1 has three different shooting modes, each to serve a different purpose and shooting style. Interfit’s new S1 Remote for Canon or Nikon enables photographers to take advantage of their camera’s TTL system just like they would with a speedlight. This automated light output uses the S1’s entire 7 stop power range (500Ws – 7.8Ws), is automatically calculated in 1/10th stop increments, and allows for +/- 3 stops of exposure compensation, manually adjustable within 1/3rd of a stop. Having an automated flash exposure allows the photographer to quickly and easily achieve their vision. This automatic mode is ideal for environments with constantly changing ambient light, and shoots that require you to quickly change your setups or location.
For those that prefer to have complete control over their light and have time for fine-tuned adjustments, the S1 can be used in the traditional manual mode. Manual shooting mode also utilizes the entire 7 stop power range, controllable in 1/10th stop increments. While in manual mode, users gain access to the S1’s High Speed Sync mode, reaching shutter speeds up to 1/8000th of a second. High Speed Sync mode utilizes the top 4 stops in the power range (500Ws – 62.5Ws) and is manually adjustable in 1/3rd stop increments.
Utilising IGBT technology, the S1 is able to offer short flash durations while maintaining color accuracy throughout the power range. Flash duration ranges from 1/1,000 at full power, down to 1/9,000 at minimum power. By shortening the flash durations, we were also able to improve color accuracy, giving the S1 a consistent 5700k (+/-100k) color temperature throughout the entire power range.
S1 TTL Remote:
The S1’s TTL remotes give the users direct control over any S1 light in any shooting mode from the camera position. This camera-mounted transmitter is available for both Canon and Nikon camera’s and supports E-TTL ll and i-TTL protocol, respectively. Having three individual groups gives users the freedom to control lights individually to create dynamic lighting ratios with a working range of up to 100m (300’).
Interfit S1a - AC-powered flash:
The S1a has all of the same features as the S1 sans battery. This unit is designed primarily for use in studio or for photographers who have already invested in external power packs with sine wave inverters. Slightly smaller than the S1, the S1a works seamlessly with its battery-powered counterpart at a 40% lower price point.
We made durability our priority for our portable flash units, so we built the S1 and the S1a within a strong and lightweight aluminum body rather than plastic. We also include a frosted glass diffuser dome to protect the flash tube. Both the S1 and S1a feature the widely-used Bowens S-Type modifier mount, giving users hundreds of high quality and affordable modifier options to choose from including Interfit’s line of softboxes, reflectors, grids, beauty dishes and more. A mini-USB cable is included with every light, allowing for firmware updates when new cameras are released.
Maximum Watt/Seconds: 500Ws
Guide Number 100ISO, 1/125sec., 3m (10’): 48.7m (160’)
Spread the cost of this item over 12 months. With a 0% finance, no deposit and monthly repayments by direct debit this option is simple to manage. Please see the repayment example below to see how much purchasing this item on finance would cost.
Item Value (Cash Price)
Total Amount Credit
11 x £33.25
Total Amount Payable
Annual Rate of Interest
Are you eligible for finance?
Applicants must be:
Aged 18 years or older from the application date
In permanent UK residence for a minimum of three years
Fulfil at least one of the following employment criteria:
In regular, permanent employment.
Retired from regular employment - With a minimum age of 50.
Not working through disability.
Note: All applicants will be subject to a credit reference check by the lender.
Credit is subject to application and status. Warehouse Express Ltd trading as Wex Photo Video act as credit broker and not the lender. Barclays Partner Finance act as the lender.
How does it work?
Where a qualifying product is added to your basket, the full value of your basket, including any accessories purchases, will be eligible for interest free credit. This is subject to the value of the additional products not exceeding the value of the qualifying product. No deposit is required and payments will be collected by direct debit in monthly instalments, the first instalment being collected 30 days after shipment of the product.
What will I receive from the finance provider (lender)?
Barclays Partner Finance will send a loan agreement pack approximately four weeks after delivery of the goods, confirming that the account has been activated and, from this point, it is possible to make repayments against the loan.
For further information on how our finance product work, see our Finance help section.
To apply for finance, follow these three easy steps
1. Add items to your basket, and click 'Checkout'.
2. When selecting your Payment Option, choose ‘Apply for Finance’, and select your offer and terms.
3. Complete the Barclays Online Application form.† Make sure you have your bank details at hand.
† Once your application has been accepted, usually within minutes, we will immediately dispatch your equipment.