TV/manual mode

[90blackcrx]

I know I asked something like this before, but today I was shooting in manual mode, and then in TV mode. In tv mode I was setting the shutter at 60 the aperture was 1.8 . Now when I went to manual and set it the same way, it was way underexposed. I'm just curious on whats going on, I mean why does it say its correclty exposed in TV mode, but then not in manual.

[KIPAX]

I am guesisng 1.8 was the limit so couldnt change.. If you went to AV mode and set 1.8 I am betting the shutter speed wouldn't be anywhere near 60

[Moppie]

Did you take the picture in TV mode?
And what was the cameras meter telling you when you switched to M?

Tv mode will only use a very wide open aperture if there isn't enough light to work with the selected shutter speed. It sounds like you also need a slower shutter.
I'm not sure how the 350D works exactly, but on my A80, and my 30D, the aperture setting will flash if the shutter speed is to high, or to low for the aperture range of the lens.

[Buggbairn]

Did you take the picture in TV mode?
And what was the cameras meter telling you when you switched to M?

Tv mode will only use a very wide open aperture if there isn't enough light to work with the selected shutter speed. It sounds like you also need a slower shutter.
I'm not sure how the 350D works exactly, but on my A80, and my 30D, the aperture setting will flash if the shutter speed is to high, or to low for the aperture range of the lens.

It's the same on the 350D, your display will flash and you'll start to see the exposure pointer dropping off to tell you the camera will under expose the shot.

[PacAce]

It's the same on the 350D, your display will flash and you'll start to see the exposure pointer dropping off to tell you the camera will under expose the shot.

Are you sure about the meter pointer dropping off? From what I''ve read in the 350D manual, it seems to behave the same way the 30D does in Tv mode in that you only get the flashing aperture to indicate that you are going to be underexposing (or overexposing) the shot. The meter pointer stays at where ever you had set your EC to.

[Moppie]

In Tv and Av mode the meter should indicate any amount of EC applied, that seems to be a common feature on all Canon cameras.

But, in M mode, it would have changed to show the under exposure.

[90blackcrx]

I took the shot in tv mode, the shutter was set at 60 and F/stop was 1.8. Exposure was correct. Whats EV mean ?

[Moppie]

Can you post both photos?

Sorry, EV should be EC, for Exposure Compensation :)
I'll edit it and fix it.

[ScottE]

The camera is probably set with the Tv/Av override custom function, whatever it is called. For example, in Tv mode with this function set, if you choose a shutter speed of 1/500, but the lens aperture is not wide enough to get an adequate exposure, the camera will override the 1/500 and lower the shutter speed to get proper exposure.

I remember seeing this when I first got my camera, but can't remember what it is called.

[90blackcrx]

Here is one pic I shot in manual mode with 1/60th for shutter. Pretty sure it says it was under EX but it does not look to bad really.
http://i3.photobucket.com/albums/y72/90blackcrx/IMG_3318.jpg

Would it matter that when I focused, it was on the black part of the engine ( valve cover )

[Moppie]

Ok, that is 1/60th at F4.5.
Not F1.8?
I take it you used the kit lens for this?
It also looks like you've used the flash which confirmed with the EXIF info.


What is telling you its under exposed? The meter or your interpretation of the histogram? It certianly looks very well exposed, especialy given its a white car with a black engine in it, thats very hard to shoot right.
And can you include the photo shot in Tv mode as well for comparison?


By where you focused I assume you also mean you took the exposure reading in the same place?
If so it depends on what metering mode you were useing.

[90blackcrx]

Sorry I was tired yesterday, when shooting in manual mode, with a shutter of 1/60 and the f/stop at 4.5 it says its under exposed but thats the same setting the camera said while shooting in tv mode

[Moppie]

Ok, now just answer these questions:

Was the shot taken in Tv mode under exposed?
Can you please post it, so we can compare?
Did you use the flash in both photos?
What "says" its underexposed, last time I held a 350D it didn't say very much.

[90blackcrx]

The pic above was in manual mode, it was showing under exposed on the meter on the screen.

This pic was in AP mode, I know not TV mode but still same deal. It was shot with the same settings I believe. The point is, I could be standing in the same spot, same settings, in TV mode ( it would set its self correclty ) if I went to manual and put those settings in, it would show under exposed.

http://i3.photobucket.com/albums/y72/90blackcrx/IMG_3316.jpg

[ibdb]

Flash. Take the shots without flash in better lighting and this will all be different (and easier to understand).

Maybe the camera is calculating the effect of flash differently in the two shooting modes. When I shoot flash manual I consistently see the camera telling me it's underexposed, because it doesn't know how the flash will light the scene. After the flash fires, the shot turns out properly exposed (as long as my manual settings were close enough to something my flash could light).

I don't use the flash often enough in any other mode (other than P) to remember what the meter might indicate before the shot. In P, the camera frequently sets 1/60th, however, which may be why you're getting the results you're getting.

[canonphotog]

The camera is probably set with the Tv/Av override custom function, whatever it is called. For example, in Tv mode with this function set, if you choose a shutter speed of 1/500, but the lens aperture is not wide enough to get an adequate exposure, the camera will override the 1/500 and lower the shutter speed to get proper exposure.

I remember seeing this when I first got my camera, but can't remember what it is called.

It's called Safety shift. By default it is enabled. You can disable it in the C.fn's

This feature can save the day or irritate you to no end if you don't know when it is affecting your shots.

[Moppie]

Flash. Take the shots without flash in better lighting and this will all be different (and easier to understand).



Exactly.

In any of the semi or fully Auto modes there is no exposure meter.
The meter you see simply indicates how much exposure compensation you have used.
In manual of course it becomes a reflected light meter, working in what ever metering modes your camera has.

90blackcrx, when you took the photo in Tv, or P, or any other semi auto mode, the camera did its possible best to expose what ever you metered. In this case, shooting in P, it decieded it needed to use the flash, so choose the flash sync speed of 1/60th, and the widest apature it could to get as much ambient light in as possible.
It then used the flash to properly expose the photo. (and did a bloody good job if I do say so).

Then, when you switched to Manual, you simple took the same photo, useing the same settings. But, becuase 1/60th @ F4.5 was not enough light for a proper non-flash exposure the meter told you it thought it was underexposed.
What you need to know is that the cameras meter does not take into account the effect of flash.
So when you took the photo with the flash on, it made a second seperate exposure, which surprise surprise is very similar to the other one, auto mode one.