Beginner's question on A vs. M :)

Started Feb 1, 2014 | Discussions thread
scokill Veteran Member • Posts: 3,635
Re: Beginner's question on A vs. M :)

Nikonparrothead wrote:

wireless wrote:

I notice many people use A-priority. You can usually tell because you'll see EC adjusted or by the way they talk about the settings, e.g., "resulted in a shutter speed of xxx."

I switch to AP in a lot of dynamic situations where there isn't time to go full manual.

The thing is you still need to adjust EC on the fly which to me is close to the same thing as adjusting aperture or shutter speed in M. I don't know what the advantage is. Maybe a tad easier.

One way to have the best of both worlds perhaps is to use Auto ISO in manual.

My question is does a doubling or halving of ISO equal the same thing as a stop or a doubling or halving of SS? In other words will Auto ISO cover the same range as, say, +- 2 stops of EC?

I would rather know/set my A and SS and let ISO take care of light variations.

best, David

p.s., how does Auto ISO interact with AP's adjustment of SS?

Yes, the three things -- ISO, shutter speed and aperture -- are all related. So if proper exposure is ISO 400, F4, 1/500 and you chose to decrease the ISO to 200, that would require more light so you could either shoot ISO 200, F2.8, 1/500 to maintain the shutter speed or ISO 200, F4 1/250 to maintain the depth of field. And yes, you could just set the aperture and shutter speed manually and let auto ISO handle metering variations.

In the old days, auto ISO wasn't possible since the medium of record was film and (with the exception for chromogenic B&W film) essentially locked in at one ISO (it was called ASA back then) until you changed to another roll of film.

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'Nice pen, bet you write good stories with it.'

Nice explanation.  The only downside to Manual and Auto ISO is if you have variation in the available light and hit your auto ISO max, you will underxpose.  If you are in A mode auto ISO, you will not underexpose, the shutter speed will drop and you will get "metered" exposure.  The downside is you could get motion blur/camera shake.  Just depends on preference really.  If I'm shooting under stadium lights and it fairly equal, I may shoot M with auto iso.  If I'm shooting stage/dance I'll use A and let the shutter speed drop if I hit max ISO instead of underexposure.

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