topic EOS 5D Mark III/3 Blinking Green Light in EOS DSLR & Mirrorless Cameras

EOS 5D Mark III/3 Blinking Green Light

gary6557 — Thu, 07 Mar 2024 20:16:21 GMT

I live on the coast about 40 miles south of Cape Canaveral. When Falcon rockets head due south I can photograph them from my balcony except at night. Tripod mounted, MF, focus set on horizon etc etc, but when I press shutter it will not take a picture and there is a flashing green light in the lower right corner of view finder. Scoured pages, internet etc, missed plenty of great shots and just need some guidance or direction. Thankyou.

Re: EOS 5D Mark III/3 Blinking Green Light

jrhoffman75 — Fri, 08 Mar 2024 01:23:32 GMT

That blinking indicator means autofocus is operating and can’t achieve focus. Are you using a Canon brand lens? What exposure mode are you using? Does camera indicate correct exposure? If you aren’t in M mode camera won’t fire if correct exposure can’t be achieved.

Re: EOS 5D Mark III/3 Blinking Green Light

gary6557 — Fri, 08 Mar 2024 11:59:10 GMT

Canon 24-70 lens set to MF and camera is in manual mode. Exposure is set to F8, ISO160

Re: EOS 5D Mark III/3 Blinking Green Light

jrhoffman75 — Fri, 08 Mar 2024 12:14:01 GMT

I just tested with my 1D X.

With lens in MF mode I manually focus - green dot is off until I get focus and then it turns on.

In AF mode it blinks green until it focuses and then it turns solid.

Sorry, but I can't help.

Re: EOS 5D Mark III/3 Blinking Green Light

stevet1 — Fri, 08 Mar 2024 12:33:01 GMT

gary6557,

Try putting your camera in Servo mode. See if that makes a difference.

Also, do you experience this across all lenses, or just this one?

Steve Thomas

Re: EOS 5D Mark III/3 Blinking Green Light

gary6557 — Fri, 08 Mar 2024 18:32:26 GMT

Shooting at night along the coast in pitch darkness except for distant light outside of focus points. This is so I can get a good 3 minute exposure through the view finder from one side to the other. Thought that if I pre focused during light in Manual mode and MF on lens that that would be sufficient, apparently not.

Re: EOS 5D Mark III/3 Blinking Green Light

jrhoffman75 — Fri, 08 Mar 2024 20:49:40 GMT

Do you have any Custom Settings or Functions set? Maybe reset camera. What you did is exactly how I take my astrophotography shots - Milky Way and star trails. I focus on a distant point, set the lens to MF and gaffer tape the focus ring so it doesn’t change. M mode with my desires Tv and Av.