Auto ISO
Aug 23, 2021 10:35:21 #
Lee Thomas wrote:
In setting up my Nikon D7500, I came across Auto I... (show quote)
There are many opinions on the use of Auto ISO and none of them are wrong. It’s an individual preference on how ISO is used. I only use Auto ISO when I am shooting in changing light conditions and am in Manual Exposure Mode because I want to maintain a specific Aperture and Shutter Speed settings.
Aug 23, 2021 10:38:04 #
kcooke wrote:
I Manually set shutter speed and f stop using auto iso for action or movin wildlife. Otherwise manual and starting ISO of 50 or 100. Not saying it’s right it’s just what I do and works for me
I'll have to give Manual a try adjusting aperture and shutter speed for the conditions. Using Aperture mode, I was concerned that some of my indoor shots may go too low on the shutter speed but as I recall, the slowest was 1/80 sec.
Aug 23, 2021 10:50:18 #
TriX wrote:
I use auto ISO almost exclusively (except with ETTL flash) and use the exposure compensation (EC) to make exposure adjustments if necessary, but I use manual for shutter speed and aperture (adequate SS to freeze motion including camera shake and aperture to produce the desired DOF). Using multiple automatic modes simultaneously (such as auto ISO and aperture priority) can produce unpredictable results
I totally agree...
Aug 23, 2021 10:59:03 #
Lee Thomas wrote:
I'll have to give Manual a try adjusting aperture and shutter speed for the conditions. Using Aperture mode, I was concerned that some of my indoor shots may go too low on the shutter speed but as I recall, the slowest was 1/80 sec.
It can be difficult using Manual Exposure with Nikon’s AF-S lenses because the AF-S lenses do not offer very useful Distance or DoF scales. Even the AF lenses can be iffy. You may want to consider buying a Manual Focus (Nikon) 35mm f/1.8 to begin with. KEH.com usually has a good supply of used lenses if you want to avoid the cost of new.
Aug 23, 2021 11:03:34 #
Lee Thomas wrote:
I'll have to give Manual a try adjusting aperture and shutter speed for the conditions. Using Aperture mode, I was concerned that some of my indoor shots may go too low on the shutter speed but as I recall, the slowest was 1/80 sec.
This slowest shutter speed depends on the lens focal length. I am not sure what it is on the D7500 but on an FX camera it's 1/focal length.
Aug 23, 2021 11:20:21 #
Again, I shoot mainly birds, so comments may not be applicable to other subjects. But, I almost always to get the greatest speed out of my lens, so I am shooting wide open all the time (one variable eliminated). Also, I want a shutter speed that is adequate to freeze moving subjects and fast enough to eliminate camera shake (so for any given subject my shutter speed is constant (two variables eliminated). So the only other variable available for exposure is ISO. I simply vary my ISO (manually) to achieve the correct exposure. And, with a constant source of light, (the sun on cloudless days) it only takes a few clicks (1/3 stop increments), it doesn’t take much of adjustment to keep the exposure within reason.
Aug 23, 2021 11:22:59 #
BebuLamar wrote:
This slowest shutter speed depends on the lens focal length. I am not sure what it is on the D7500 but on an FX camera it's 1/focal length.
I just did a test in Manual mode and it allowed me to use shutter speeds well below 1/50 (using the 50mm lens) . The end result would have been a very small aperture with a very high Auto ISO. Perhaps it works differently on your full frame camera.
Aug 23, 2021 11:24:36 #
Lee Thomas wrote:
I just did a test in Manual mode and it allowed me to use shutter speeds well below 1/50 (using the 50mm lens) . The end result would have been a very small aperture with a very high Auto ISO. Perhaps it works differently on your full frame camera.
Exactly the reason to set SS manually.
Aug 23, 2021 11:33:21 #
Lee Thomas wrote:
I just did a test in Manual mode and it allowed me to use shutter speeds well below 1/50 (using the 50mm lens) . The end result would have been a very small aperture with a very high Auto ISO. Perhaps it works differently on your full frame camera.
I meant in Aperture Priority mode and auto ISO. The slowest shutter speed depends on the lens focal length. On manual you can set any shutter speed you want. But I never use Auto ISO with manual. I use manual instead of EC. I never use the EC.
Aug 23, 2021 12:45:08 #
On most Nikon bodies, in Aperture mode, when you set Auto ISO you also set minimum desired shutter speed. As you change your aperture, that desired shutter speed does not change, but ISO changes as needed to get the exposure right.
Aug 23, 2021 13:00:15 #
photoman43 wrote:
On most Nikon bodies, in Aperture mode, when you set Auto ISO you also set minimum desired shutter speed. As you change your aperture, that desired shutter speed does not change, but ISO changes as needed to get the exposure right.
So if the SS never changes, what’s the point of using aperture priority instead of manual with auto ISO?
Aug 23, 2021 13:30:15 #
I change the aperture to meet changing needs like depth of field, hyperfocal distance, blurring backgrounds, and light conditions. If it is bright out, I might use f8. As light decreases I might use f5.6. f4 or f2.8 For me this is the easy way to do things. if M is easier for you then use it. The goal is to use something that works for you.
Aug 23, 2021 13:32:07 #
TriX wrote:
So if the SS never changes, what’s the point of using aperture priority instead of manual with auto ISO?
The SS does change. For example if you set the camera in A and auto ISO with min ISO of 100 and max ISO of 6400 and you're using a 50mm lens. Now for example you set your aperture at f/8 and under sunny 16 condition the shutter speed will be 1/400 and the ISO is 100. As the sun goes down the shutter speed will change to slower speed until it reaches 1/50 and when the light goes even darker it won't go slower but rather it increases the ISO. As the light gets darker and darker it keeps the shutter speed at 1/50 and increasing the ISO until it reaches 6400. If the light goes even lower it would now slow the shutter speed and not increase the ISO any more.
Aug 23, 2021 13:43:24 #
kcooke wrote:
I Manually set shutter speed and f stop using auto iso for action or movin wildlife. Otherwise manual and starting ISO of 50 or 100. Not saying it’s right it’s just what I do and works for me
I’ve always used a fixed ISO , never any exceptions, cuz it’s just one less variable to keep an eye on. Also, if the exposure varies from from to frame it’s annoying during PP.
It’s MNSHO that any form of AE is more often responding to changes in framing rather than variations in the incident light. Changing just how much sky I’m allowing near the margins should NOT require new exposure settings, but AE doesn’t agree about that. I can never tolerate a camera disagreeing with me and “correcting” my settings.
Aug 23, 2021 14:19:26 #
NKShootSS wrote:
On my bucket list is getting a decent eagle photo.... (show quote)
The key to good eagle photos is location. If you have the right gear and know how to use it then all you need is to be where there are eagles to photograph. My favorite local spot for Bald Eagles is the Conowingo dam on the Susquehanna river in northern Maryland. I own the Sigma 150-600 Contemporary in Nikon mount and the Sport in Canon EF mount. It's a really nice lens for the cost, although the sport is a bit on the heavy side.
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