Re: EOS R3 - let's talk about Av vs Fv
1
- quadrox wrote:
Horrgakx wrote:
Aperture Priority vs Flexible Priority.
The manual says about Fv; "In this mode, you can set shutter speed, aperture value, and ISO speed manually or automatically and combine these settings with your choice of exposure compensation.".
I want to understand this more so has anyone got any real-life examples where they've preferred using Fv over Av ... and why?
It's really quite simple:
The advantage of Fv is that you can decide on the fly which settings to automate and which to choose manually. The disadvantage is that changing settings is a bit more complicated since you first have to select which setting you want to modify.
Conversely, changing settings is simpler because you don't have to change your grip to find and use the exposure compensation or ISO setting dials because your thumb is already on the rear dial and it's just one or two clicks to the right with your thumb to adjust either, using the same wheel you were setting the aperture with. I use Fv as a super Av mode on the EOS R.
The advantage of Av is that it is simpler/faster to understand and use. The disadvantage is that it can only do one thing - aperture priority.
So if you know exactly which setting needs to be fixed - e.g. if you are doing a sport/action shoot and *always* need a fast manual shutter speed, you will prefer to use e.g. the S mode. Or for portraits you may prefer the Av mode.
If your subject/theme is not fixed and you may want to switch things up, then Fv can be useful.
Finally, Fv will *not* respect your shutter speed limits if you have any configured, at least not on the R5. Why that is, I have no idea.
Fv does respect the overall shutter speed range you set in C.Fn2:Exposure, but not the minimum shutter speed you set in SHOOT3 ISO speed settings - it falls back on Canon's traditional 1/f shutter speed. I don't find the SHOOT3 ISO speed settings very useful as I shoot a wide variety of subjects, so checking this menu item at the start of every session is more inconvenient to me than keeping an eye on the shutter speed or using Tv mode. I seem to be in a minority here.
The other two things Fv mode won't do are the B setting (neither will M mode, B is a mode all to itself) and it won't give you metered manual exposure. The exposure compensation scale resolutely remains that, even though it's redundant when you take control of shutter speed, aperture and ISO all at the same time.
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