topic Re: EOS 70D High ISO required in bright daylight in EOS DSLR & Mirrorless Cameras

EOS 70D High ISO required in bright daylight

Rle16 — Tue, 26 Aug 2025 18:33:18 GMT

Hello,

I have a 10 year old canon 70D camera. I typically shoot with the EOS 70D EF-S 18-135 mm IS on. This is the same one I got with the camera 10 years ago.

I’ve been noticing in the past ~3 years that even in broad daylight and lowest aperture available. To get a decent shutter speed for movements, I’m having to put my ISO at 800 plus.

I didn’t used to have to be that high in ISO while outside in a bright sunny day. Not sure what has changed or any suggestions to fix? High iso is killing my photos in noise.

Re: EOS 70D High ISO required in bright daylight

deebatman316 — Tue, 26 Aug 2025 18:47:19 GMT

What mode are you shooting in first of all. What aperture are you shooting at because that makes a difference. The lens you’re using is a variable aperture lens. The more you zoom in the less light enters the camera. At 18mm the widest aperture possible is F/3.5. But at 135mm the widest aperture available is F/5.6. So depending on your focal length wide open changes. Also what do you mean by a “decent shutter speed for movement”. What are you taking a picture of. Is this wildlife or sports that requires a very fast shutter speed.

Re: EOS 70D High ISO required in bright daylight

kvbarkley — Tue, 26 Aug 2025 18:54:45 GMT

Go outside on a sunny day. Set the camera in manual mode to f/16, the iso to 100 and the shutter to 1/100 second.

Is the shot properly exposed?

Re: EOS 70D High ISO required in bright daylight

kvbarkley — Tue, 26 Aug 2025 19:55:24 GMT

(This is the OG "Sunny F16 rule")

Re: EOS 70D High ISO required in bright daylight

normadel — Wed, 27 Aug 2025 05:27:20 GMT

Or, set the camera in Program (P) mode and Auto ISO and take pictures outside on bright sunny day. How do they look? What ISO is the camera choosing? Do same with ISO set to 100 manually.

Re: EOS 70D High ISO required in bright daylight

Rle16 — Wed, 27 Aug 2025 13:08:21 GMT

Hello, yes I am aware my aperture changes as I zoom in. And I’m taking essentially sports photography. My concern is this behavior has started in last 3 ish years of seeming to need higher ISO to support higher shutter speeds than before.

Re: EOS 70D High ISO required in bright daylight

Rle16 — Wed, 27 Aug 2025 13:20:27 GMT

went outside and took the pictures to your advice. Top image is from my camera. Second is from my phone to show how sunny the day is for reference.

Re: EOS 70D High ISO required in bright daylight

normadel — Wed, 27 Aug 2025 21:36:01 GMT

You DO need higher ISO with faster shutter speed, if aperture stays the same.

Re: EOS 70D High ISO required in bright daylight

Rle16 — Wed, 27 Aug 2025 23:55:44 GMT

I am aware. But what specifically I am asking is my camera is not performing as it once did. I never used to have to go THAT high in my ISO to support higher shutter in broad daylight

Re: EOS 70D High ISO required in bright daylight

kvbarkley — Thu, 28 Aug 2025 01:45:45 GMT

That shot is obviously a lot darker. Do you have another lens to try? I can only think that the aperture is off somehow.

Re: EOS 70D High ISO required in bright daylight

p4pictures — Fri, 29 Aug 2025 08:10:13 GMT

Do you have a filter on the lens on your DSLR?

I couldn't find the EXIF data in the DSLR image, but you should be able to see it on the camera in playback.

The phone photo lists the settings used as 1/1700 f/1.8 ISO 80.

Re: EOS 70D High ISO required in bright daylight

kvbarkley — Sat, 30 Aug 2025 02:37:52 GMT

I would hope that the DSLR image is manual, with f/16 ISO 100 and shutter 1/100 - The sunny f16 rule that I asked for.

Re: EOS 70D High ISO required in bright daylight

Rle16 — Wed, 03 Sep 2025 13:45:26 GMT

Yes that was how the camera image was taken. No lens filter those manual settings.

Re: EOS 70D High ISO required in bright daylight

kvbarkley — Mon, 08 Sep 2025 21:48:06 GMT

Do you have another canon lens to try?