Beginner's question on A vs. M :)

Started Feb 1, 2014 | Discussions thread
Stacey_K Veteran Member • Posts: 8,425
Re: Beginner's question on A vs. M :)

wireless wrote:

Stacey_K wrote:

wireless wrote:

Stacey_K wrote:

Lets say you are shooting in M and go from shooting indoors to outside. You were using F5.6 inside and want F4 for the shot outside.

In M mode you walk outside, change the fstop and (while watching the meter) go from 1/30 to 1/1000 (quite a lot of dial rotation). And then you realize you actually need 1 stop of EC so turn the dial back 1 stop.

For me, I wonder what the advantage of M would be? I use M in the studio with controlled lighting, the rest of the time I use A.

I think the key point is EC doesn't do anything when in M except cause the meter in VF to change. Then, once you notice the image is under or overexposed you need to change f stop or SS (as opposed to EC in AP).

Why would anyone change EC in M mode, of course that does nothing except change the meter reading. Well unless auto ISO is being used, then it does but that would defeat your reason for using M mode so I assume you never use auto ISO either?

One post earlier you give an example where you say change it in manual.

Reread my post, I said "then you realize you actually need 1 stop of EC so turn the dial back 1 stop." Turning the shutter speed 1 stop off of the metered reading is performing EC. But if you are using auto ISO, there is no EC from simply changing the shutter speed as the auto ISO is going to follow the meter unless you have hit the floor or peak of the ISO adjustment range.

I told you why it's of little use. My original post is about using auto iso in manual vs. using AP and letting the camera decide shutter speed. I wondered the pros and cons and we've seen some good posts on that. I.e., controlling or constraining shutter speed in AP while using Auto ISO to compensate for lighting outside of that. Also Auto ISO alone a la manual can cause a severely limited DR. That about sums it up.

Using auto ISO in M mode requires you still use the EC button if you want to change the exposure from the meter reading.

That's one reason I like manual, you adjust on the fly and the relationship between SS and aperture or very direct. With EC changes in AP your indirectly causing the camera to adjust its SS.

Actually is does directly change the shutter speed unless auto ISO is also in play. Which brings to mind if you are using M mode in the manner you describe, you must have auto ISO off, which becomes yet another setting you have to look at and consider as well as the aperture/shutter speed. I'll admit trying to look at all that, compose, judge the proper timing of the shot etc is more than I want to deal with.

I agree. I prefer to do it all manually but in many or more than 50% of my shooting there's not time for that.

If you have auto ISO turned on, you aren't doing it manually, the camera is still setting the exposure via the meter and any EC must be set.

You still have two things to adjust for proper exposure in manual just like AP. Leaving aside ISO for a second, you need to adjust aperture and EC in AP and aperture and SS in M.

If you like shooting M mode with auto iso turned off, great. You asked the question, claiming you are a newbie, now sounds like you want to school me on why people should use M mode.. I was simply trying to explain why I use A mode more than M, not looking for an argument

Not schooling you. You didn't seem to know EC doesn't do anything in M.

I do understand it does nothing in M mode as far as exposure -if auto ISO is turned off-.

I didn't know that myself for a time. I was merely pointing out that you still have two adjustments in either M or AP mode to get the exposure right. I even noted not to include ISO in the equation. Auto ISO is another matter. I guess the most important thing I learned out of this thread is more fine tuning of the Auto ISO constraints to keep shutter speed up but put a ceiling on it to keep DR good. Not perfect but certainly digging details out of the dark when ISO is high is a losing proposition especially on people's faces, etc.

I think you need to delve deeper into this and understand with auto ISO in M mode you still have to use EC and there are not three control wheels. If you use A mode, one wheel can control aperture and wheel setup for EC as needed and let the camera manage  ISO and shutter speed as you set it up to manage them. Using M mode -requires- you to push the EC button and keep up with that adjustment if auto ISO is being used or else the camera decides the exposure for you and no EC possible.

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