EOS R5 Mark II shutter priority during video

[afterburndigi]

Hi,

I'm a hybrid shooter working within entertainment, my primary bodies consist of the R5 C, and my R5 Mark II as a backup. Currently my R5 C is away for repairs and I had to use my Mark II as my A camera on a shoot.

For context, I always shoot shutter priority allowing for auto aperture with my RF28-70mm F2, and my RF15-35mm F2.8. Something I couldn't figure out for the life of my was how to lock my ISO/Shutter Speed, but have my aperture still be set to auto. For my specific use case, I film concerts with varying levels of pyro and flames, so this has always been essential when I'm flying my camera on a gimbal and can't adjust aperture on the fly. 

Fv mode is great for stills, but a video equivalent would be great, I threw in the footage in Davinci and the auto iso during Tv mode has so much noise going in and out depending on the lighting. Having a Native ISO of 800/4000 is great, but kind of defeats the purpose if it's varying between while shooting CLog3. 

Wondering if anyone has run into this type of problem as well. 

[Waddizzle]

“ Something I couldn't figure out for the life of my was how to lock my ISO/Shutter Speed, but have my aperture still be set to auto. “

Try Tv mode.

[afterburndigi]

That's the main issue. In Tv Mode during video, it defaults to auto iso/aperture. Shooting in LOG format, I need to have my iso's at the native bases to avoid noise. 

The R5 C for example, I can set/lock my iso and shutter speed, then set my aperture to auto when using an RF lens to compensate for bright flashes during concert recording if I am using a gimbal. 

[stevet1]

afterburnfdigi,

I have  T8i. If I set my camera to Av or TV Mode in video shooting, the camera defaults to P Mode, and I can't make any changes. If I want to adjust any of the settings, I have to set the the camera to M mode.

Perhaps your camera has some variation of the same defaults.

Steve Thomas

[Waddizzle]

What lens are you using?  Are you using an RF lens?  

Many DSLR lenses are not to smoothly transition from one aperture setting to the next.  Instead, they will “jump” from one setting to the next, behaving much like an aperture ring would.  They do not exhibit what is known as “declicked” aperture ring behavior, although there are a few exceptions.  

Some DSLR lenses make smooth, continuous settings from one aperture to the next.  But the vast majority do not and can actually quite noisy.  The slap of the mirror in a DSLR tends to mask the sounds the aperture system may make.

Canon first introduced the STM lenses for the their DSLRs with video in mind. Not only are the focusing motors quieter than the contemporary lens designs, the apertures were quieter and exhibited the declicked behavior. I think the entire RF line of lenses has smooth aperture behavior.

I tested my R6ii shooting video in Tv mode.  I tested with different L Series DSLR lenses and the RF 50mm f/1.8.  I had mixed results depending upon the lens design, but mainly the maximum aperture.  

Using a very wide aperture lens may not be a complete cure, but it may resolve the issue in many shooting scenarios.  The wider the better, it seems.  I suggest using the widest aperture lens in your bag.  Here’s why

Yes, the ISO switched to Auto. But it did not go below 800.  The only times when it seemed to raise above 800 was in low light situations when the aperture could not go wide enough to maintain the exposure.  When there was more than enough light, the aperture would stop down while ISO maintained at 800.

Again.  Exactly what lens are you using?