Showing results for 
Show  only  | Search instead for 
Did you mean: 

Will Canon 600ex-rt work with Canon 1100D?



I recently bought cactus 60rf and apparently there is no af assist beam in it, which when i tried to take a picture in the dark it didn't automatically focus.

So i will return this flash to the store and buy Canon 600ex-rt, and my question is, if this speedlight's assist beam will help me focus in extreme low light situations, i mean if will it work properly with my camera (Canon 1100D).

Please answer me as fast as possible,



Yes, it will work, but you shouldn't expect miracles. You'll always be limited by the sensitivity of the camera's AF system. So the AF assist beam will help, but it won't be as effective as it would be on a higher-end camera.

Philadelphia, Pennsylvania USA


Yes, it certainly will work... But it's sort of massive overkill to get the top-of-the-line 600EX-RT primarily for it's AF Assist feature! It's a great flash, but the Focus Assist is just one of many things it can do!


If the main thing you need is Focus Assist, an ST-E2 Flash Controller module will do the same thing, and is much smaller and considerably less expensive. (Note: the ST-E3-RT does not have Focus Assist).


If you want a flash with Focus Assist, you really can pick and choose among many of the Canon flashes (as well as a bunch of third party flashes for Canon). Among the Canon flashes, Focus Assist is:


- Near Infrared type (less intrusive), 15 to 30 ft. range on: 600EX-RT, 430EX III-RT, 430EX II, 270EX II  & ST-E2


- White light flashes (rapid bursts, more intrusive: 15 to 25 ft. range: 430EX III-RT,  270EX, 90EX.


- White light, continuous LED (serves as video light too). Range 10 to 13 ft.: 320EX .


- N/A: ST-E3-RT.


For other purposes... The RT flashes and ST controller use radio to communicate with each other for multi flash setups. The 600EX-RT and ST-E3-RT can act as masters, while the new 430EX III-RT is slave only. Using radio gives them more range and greater flexibilty of placement.


The 600EX-RT (optionally) and some of the other non-RT flashes and controller use optical (near infrared light) to communicate with each other. The 600EX-RT (and the now discontinued 580EX II, 580EX, 550EX models) and the ST-E2 controller can act as masters. The 430EX II (and discontinued 430EX, 420EX) and 270EX II can be used as slaves only. The optical triggering and control requires line-of-sight setup and arrangements, and has a bit less range than the radio control.


Some of the camera's with built-in flash have optical means of controlling off-camera flashes. I don't think the 1100D is one of them, though.


03/30/2023: New firmware updates are available.

EOS R3 - Version 1.4.0

EOS R5 - Version 1.8.1

EOS 1DX Mark III- Version 1.7.1

Speedlite EL-1 - Version 1.0.2

03/30/2023: Product Advisory for EF50 F1.2 L USM

03/30/2023: Product Advisory for EOS R10

03/28/2023: New firmware version is available for EOS-R5 C
03/14/2023: New firmware version 1.8.1 is available for EOS R6
02/24/2023: We've updated Share Your Photos

2/07/2023: New product announcements!

EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM
01/18/2023: New firmware version 1.1.1 is available for EOS R6 Mark II
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5
11/16/2022: We're thrilled to be ranked among the Best Employers for Veterans in 2022 by Forbes.
08/31/2022: New firmware version 1.1.1 is available for RF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/14/2022: New firmware version 1.0.1 is available for CR-X300
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version is available for EOS-C500 Mark II
05/26/2022: New firmware version is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
03/23/2022: New firmware version is available for EOS-C70
02/09/2022: Share Your Photos is back!
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.