auto ISO sucks with X cameras

Started 2 months ago | Discussions thread
Contributing MemberPosts: 913
Re: auto ISO sucks with X cameras
In reply to Jim in Hudson, 2 months ago

Jim in Hudson wrote:

John Carson wrote:

Jim in Hudson wrote:

Fair question but one both of us should answer, not just me!

IMHO, the primary burden is on the photographer to adjust for subject motion/blur instead of having to adjust for camera-induced blur. Why? Because the camera can reasonably calculate the minimum shutter speed needed to compensate for camera blur given the effective lens focal length and whether OIS is active. By contrast, there is no algorithm to compensate for subject motion/blur because the camera can't (realistaclly) know the speed of the subject.

So what does this mean? If you're first concern is subject blur, you should be shooting in S mode where you pick the shutter speed needed for the subject. Only you know what speed is needed for a race car versus a boat to eliminate subject blur. This would leave the camera to calculate minimum shutter speed needed for all of the rest of us who want to shoot in A or P and who's first concern is camera-induced blur. Just my two cents.

Clearly, the only satisfactory solution is to allow both an absolute minimum shutter speed and a focal-length-related minimum shutter speed.

The problem with setting the shutter speed manually is that in bright conditions you might want the camera to choose a much faster speed than the minimum. I prefer to reserve manually setting the shutter speed for those emergency situations where you know the camera will choose too low a speed for some unanticipated fast moving subject.

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john carson

I understand but you can't possibly know in advance the needed minimum shutter speed required to eliminate subject motion blur.

Depends. Sometimes it's strangely predictable.

There's absolutely no relationship between motion blur of someone's face and a race car. It's going to be different for every combination of relative subject speed and focal length.

Exactly why I've been sending mails for what seems now ages to ask for quick direct access to the auto ISO minimum shutter speed in A mode, either via custom modes, toggle Fn buttons or even unused dials in A mode and auto ISO (ex : the Sony A7 has two of those in such a mode), for example.

BTW, S mode should only be reserved in theory to when a specific shutter speed is in demand (example : when shooting planes or as far as I'm concerned flamenco shows to have the right amount of blur in the dresses), just like aperture, not when only a minimum shutter speed is desired.

This is why no other camera maker (to my knowledge) has bothered to provide such a setting... they know it's a waste of time.

Hem... Nikon, Pentax, Samsung, Canon, Panasonic on certain compact cameras (weirdly not on their m43 cameras, another example of camera manufacturers' relentless stupidity), Ricoh, have all provided the ability to set a fixed custom minimum shutter speed in auto ISO.

Instead, everyone else has focused on the one thing that can be known and controlled via calculation... camera shake. For some unknown reason, Fujifilm has all of a sudden shifted gears from solving a solvable problem to solving an unsolvable problem.

Fuji's automatic minimum shutter speed algorithm wasn't entirely satisfactory since it couldn't be biased towards higher or lower shutter speeds at the user's will. Why did Fuji decide to remove this auto behaviour altogether instead of keeping an "auto" setting in the minimum shutter speed list is anyone's guess, mine is that like all camera manufacturers their design department is populated by people missing half a brain.

In fine I don't see why we still need to debate about this : it's entirely possible to have both an automatic minimum shutter speed that varies according to the focal length, and a fixed minimum shutter speed.

Then there are some useful innovative ideas Fuji could implement. Somebody proposed above another very interesting idea where the user would set both an auto minimum shutter speed bias and a fixed minimum shutter speed and the camera would pick the highest of those, which makes total sense when somebody is using a zoom with an extended range, let's say 18-135mm, doesn't want the shutter speed to go below 1/60th of a second in any case, even at the wide end, but would like it to rise when using the longer end to avoid motion blur.

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