topic How to set slowest sync speed limit for the Speedlite 580EX II on EOS R6? in EOS DSLR & Mirrorless Cameras

How to set slowest sync speed limit for the Speedlite 580EX II on EOS R6?

zhangchi1020 — Wed, 19 Feb 2025 13:09:31 GMT

Ken Rockwell writes:

To prevent the shutter speed from getting too long, many cameras (Nikon, Canon, LEICA M9, etc.) allow setting of the slowest sync speed in a menu.

But I am only able to find either 1/60-1/250 or 30"-1/250 on my R6. No option to set the slow sync limit to say 1/8. Flash is 580EXII.

Please help. Thank you.

Re: How to set slowest sync speed limit for the Speedlite 580EX II on EOS R6?

deebatman316 — Sat, 22 Feb 2025 02:02:07 GMT

What mode on the top mode dial are you using. In Av (Aperture Priority) Mode the camera sets a slow sync automatically so there is no need for that setting. If you want to manually set a slow shutter speed use Tv (Shutter Priority) Mode or M Manual Mode. Note Fill Flash IS NOT used in Manual Mode. Instead Flash is treated as Main Light and NOT Fill Flash. This CANNOT be changed in the settings.

Re: How to set slowest sync speed limit for the Speedlite 580EX II on EOS R6?

zhangchi1020 — Sat, 22 Feb 2025 04:06:15 GMT

I am in Av mode. The slow sync shutter sometimes goes too slow like 1/2 or even slower. Would like to set limit to 1/8.

Re: How to set slowest sync speed limit for the Speedlite 580EX II on EOS R6?

p4pictures — Sat, 22 Feb 2025 07:44:03 GMT

The only way to limit the shutter speed to 1/8 with Av mode when using flash is…

Set the flash sync to 30” - 1/250 and also set the shutter speed limits to 1/8 as the slowest in the custom functions menu.

Re: How to set slowest sync speed limit for the Speedlite 580EX II on EOS R6?

zhangchi1020 — Sun, 23 Feb 2025 05:12:28 GMT

This works. Thank you.