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Archive 2020 · a7r iv and ISO Auto/Minimum Shutter Speed

  
 
saxguy
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p.1 #1 · p.1 #1 · a7r iv and ISO Auto/Minimum Shutter Speed


I usually set the shutter speed myself and let the camera float the ISO with a maximum of 6400. Because I didn't read the whole manual, I realized today that the first option under ISO Auto/Minimum shutter speed is the option to set the shutter speed to slower/slow/standard/fast/faster. Is anyone using this?

When shooting candidly I usually set the shutter speed to 1/2*focal length or as close as I can get to try to retain sharpness. With the a7r iv I find this is better than 1/focal length that I was using with the a7r iii. It looks like the "fast" setting may be automatically doing the same thing.



Feb 19, 2020 at 02:27 PM
dallvr
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p.1 #2 · p.1 #2 · a7r iv and ISO Auto/Minimum Shutter Speed


Mark Galer uses the Auto ISO with slower to faster settings. https://youtu.be/gqqmqKFzHRg

I found that more confusing than using manual and just setting the minimum shutter speed that I could hand hold. So I shoot manual with auto ISO and it seems to work just fine.



Feb 19, 2020 at 02:51 PM
trogdon
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p.1 #3 · p.1 #3 · a7r iv and ISO Auto/Minimum Shutter Speed


I keep one of the custom buttons set to changing the auto minimum shutter speed. I find it helpful for when you are changing focal lengths and want to preserve a specific ratio. While M mode can get you a good shutter speed, I think it’s more difficult with zooms as that minimum changes based on focal length.

I usually leave it at slow for distant or static subjects, and fast when taking closer up or people photos



Feb 19, 2020 at 03:02 PM
jchapell
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p.1 #4 · p.1 #4 · a7r iv and ISO Auto/Minimum Shutter Speed


I use the fast-faster very frequently in lower light when I'm shooting with a wide angle and there will be subject motion and/or difficulty with good technique (for me, this is very early morning hikes in the mountains). Normally, in aperture priority the shutter speed would be somewhere around 1/20-1/60 (depending on the lens), guaranteeing subject motion blur or shake. So my options would be shutter priority (which will keep the aperture pegged wide open - not always what i want to do), or manual priority - also more than what I want. By using the "faster" dial, I keep the shutter speed up while still using the aperture as my main control. And if the light is REALLY too low where it can't expose based on the ISO limit (typically 6400 for me), it will slow the shutter speed.
Anyways, hopefully that's useful to hear one person's use case scenario.



Feb 19, 2020 at 03:14 PM
Eruditass
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p.1 #5 · p.1 #5 · a7r iv and ISO Auto/Minimum Shutter Speed


dallvr wrote:
Mark Galer uses the Auto ISO with slower to faster settings. https://youtu.be/gqqmqKFzHRg

I found that more confusing than using manual and just setting the minimum shutter speed that I could hand hold. So I shoot manual with auto ISO and it seems to work just fine.


I haven't watched his rather long video, but the main point is to automatically adjust to shutter speed to different focal lengths when in aperture priority, where typically you want to minimize camera shake and are not worried about subject motion. You simply select which slow-fast setting corresponds to what you know you can handhold at a given focal length and it translates it to all focal lengths. You change slow-fast depending on how steady your stance is: e.g. you're leaning against something vs holding the EVF up to your face vs hand-holding with the screen flipped out.

Setting it manually can be a lot when constantly adjusting zoom. And of course if you're trying to minimize subject motion blur, then use shutter priority or set the minimum shutter speed.



Feb 19, 2020 at 03:32 PM
dallvr
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p.1 #6 · p.1 #6 · a7r iv and ISO Auto/Minimum Shutter Speed


Eruditass wrote:
I haven't watched his rather long video, but the main point is to automatically adjust to shutter speed to different focal lengths when in aperture priority, where typically you want to minimize camera shake and are not worried about subject motion. You simply select which slow-fast setting corresponds to what you know you can handhold at a given focal length and it translates it to all focal lengths. You change slow-fast depending on how steady your stance is: e.g. you're leaning against something vs holding the EVF up to your face vs hand-holding with the screen flipped out.

Setting it manually
...Show more

Sounds like it is worth some experimentation with slow/fast settings on aperture priority and the slow/fast options. Thanks for the explanation.



Feb 20, 2020 at 10:10 AM
echelonphoto
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p.1 #7 · p.1 #7 · a7r iv and ISO Auto/Minimum Shutter Speed


Why not just shoot manual ss in auto iso and adjust your shutter and aperture as needed for the situation. That's what I do....shoot events and portraits....I use the 85 a lot and I feel that my minimum for that lens is 100th of a sec to insure ALL images are shake free..usually go to 125 just to be safe. With wide angle and bracing the camera I can safely shoot at a 30th...but the manual system allows me quick flexibility with this.


Feb 22, 2020 at 09:21 AM
Holger
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p.1 #8 · p.1 #8 · a7r iv and ISO Auto/Minimum Shutter Speed


echelonphoto wrote:
Why not just shoot manual ss in auto iso and adjust your shutter and aperture as needed for the situation. That's what I do....shoot events and portraits....I use the 85 a lot and I feel that my minimum for that lens is 100th of a sec to insure ALL images are shake free..usually go to 125 just to be safe. With wide angle and bracing the camera I can safely shoot at a 30th...but the manual system allows me quick flexibility with this.


To avoid any motion blur I am at 1/250th at least with the 85 (unless I need to photograph non-moving stuff). Too often I see slight motion blur when being slower.



Feb 22, 2020 at 09:36 AM
DaveFP
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p.1 #9 · p.1 #9 · a7r iv and ISO Auto/Minimum Shutter Speed


echelonphoto wrote:
Why not just shoot manual ss in auto iso and adjust your shutter and aperture as needed for the situation. That's what I do....shoot events and portraits....I use the 85 a lot and I feel that my minimum for that lens is 100th of a sec to insure ALL images are shake free..usually go to 125 just to be safe. With wide angle and bracing the camera I can safely shoot at a 30th...but the manual system allows me quick flexibility with this.


Exactly.

I might be missing something but why would one need this setting?

M mode + Auto-ISO is so easy.




Feb 22, 2020 at 10:41 AM
kimknapp
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p.1 #10 · p.1 #10 · a7r iv and ISO Auto/Minimum Shutter Speed


Same as what Dave said, but just be sure you don't limit the auto ISO max setting too low.


Feb 22, 2020 at 11:00 AM
SoundHound
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p.1 #11 · p.1 #11 · a7r iv and ISO Auto/Minimum Shutter Speed


This is a stated shutter speed meant to be predictive of critical focus for what 70, 80, 95% of the time no matter what the conditions? Critical focus is a statistical anomaly. Shooting a single frame gives you only a single chance for critical focus (whatever critical focus means to you).

Many factors affect critical focus: motion of the camera, motion of the subject, effectiveness of IBIS/OSS, (*) slop in the AF system, etc. We’re you to shoot a burst the chances that a single frame from that burst would be in critical focus is much more likely than a single frame.

Since I photograph dancers, I routinely shoot bursts if only because someone will blink, grimace, twitch or move too quickly. More shots allow more selection of micro expressions and or posture and focus too. So when in doubt blast off a burst. The longer the burst the better your chances for critical focus.

*There are truth tables around for the effect of IBIS/OSS/IS/VR. That is percentages of in focus shots (absence of motion blur) by shutter speed for the system under test.



Feb 22, 2020 at 11:09 AM
echelonphoto
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p.1 #12 · p.1 #12 · a7r iv and ISO Auto/Minimum Shutter Speed


Agree Holger, but in low light , you can't always go that high, so I still find that I can get really sharp images at 100th with the 85, I just have to be steady and gentle on the shutter release.


Feb 23, 2020 at 10:33 AM
echelonphoto
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p.1 #13 · p.1 #13 · a7r iv and ISO Auto/Minimum Shutter Speed


DaveFP wrote:
Exactly.

I might be missing something but why would one need this setting?

M mode + Auto-ISO is so easy.




Agree!
The wonderful auto iso on the a7III has revolutionized my shooting...together with the great eye af, I now can concentrate on composition and expression and feel secure that the camera will give me great exposures and sharp photos without any fuss...you just have to remember parameters...you can't shoot at a60th at f 1.4 in bright sunlight! I also use back button focus and have the af button set to med. spot af and the ae lock button set for eye af...my thumb can easily switch between the two of them as I shoot seamlessly. Also have the center button in the dial set for playback so I can check my exposure quickly without taking my eye from the viewfinder. I stuck little round pieces of velcro (the stiff half) onto the focus buttons so I can feel and push them easily on a fast pace job. The factory should put more texture onto these in production.



Feb 23, 2020 at 10:44 AM
Parariss
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p.1 #14 · p.1 #14 · a7r iv and ISO Auto/Minimum Shutter Speed


I use this feature a lot, just as described. I use Aperture Priority frequently and shoot a lot of my photos while traveling. Scenes are changing, the lighting is changing, and I'm often trying to capture a fleeting moment, reactively. I also may be using a zoom or changing lenses, so the exact minimum shutter speed I want dialed in to freeze camera shake varies. If I'm setting up a shot proactively, I have time to change all the settings as I like, but unless I'm trying to establish a certain amount of blur or freeze fast action, what I *usually* mainly care about is setting the aperture where I like, then having the shutter be fast enough to freeze any hand shaking (or perhaps some pedestrian motion) and once having accomplished that I want the ISO to float as high as it needs to (up to the cap I set) in order to accomplish these things while otherwise staying as low as possible. When the camera runs out of ISO headroom, it doesn't start giving me noisy photos it starts lengthening shutter speed, but it doesn't ever interfere with my chosen aperture. Whenever I need to I manually intervene. This features basically automates the settings I often don't care about micromanaging while keeping them within certain boundaries to the degree I do care about and usually prioritizing the order in which exposure compromises are made in the same way I would. I find that when light is growing marginal at the end of a travel day I often end up intervening more as more critical choices need to be made. I can totally see how someone else might never use this feature, but I love it.


Eruditass wrote:
I haven't watched his rather long video, but the main point is to automatically adjust to shutter speed to different focal lengths when in aperture priority, where typically you want to minimize camera shake and are not worried about subject motion. You simply select which slow-fast setting corresponds to what you know you can handhold at a given focal length and it translates it to all focal lengths. You change slow-fast depending on how steady your stance is: e.g. you're leaning against something vs holding the EVF up to your face vs hand-holding with the screen flipped out.

Setting it manually
...Show more




Feb 23, 2020 at 08:13 PM
sebbe
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p.1 #15 · p.1 #15 · a7r iv and ISO Auto/Minimum Shutter Speed


For static stuff in low light I prefer "slow". When I change my lens, the shutterspeed is adapted. If the light isn't that low I prefer rather "fast" or at least "normal" to get a better hitrate.
For all other I'll take A-mode, the needed minShutter+ autoISO.

I never use M-mode because there are often situations where autoISO hits min or max ISO-settings and I'm happy then the camera do compensate with an adapted shutterspeed.
For example with ISO100 I'll get 1/500s instead of 1/125s and outblown whites. On the other hand when it is too dark for ISO12800 and 1/125s I'm happy it lower to 1/60s because often this is still enough and with higher ISO it's getting garbage.



Feb 24, 2020 at 09:19 AM





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