dRebel Shutter Priority Woes

[elkootcho]

Maybe someone here can help me with this issue. The way I understand it, when selecting Tv mode on the dRebel the camera automatically selects apature to give you a decent exposure. Yet everytime I try to shoot using Tv mode my pix are completely blown out.

The attached specs are as follows: (shutter priority) 1/5 sec., F22, ISO 100, 18mm (kit lens). Shot RAW.

What am I doing wrong? :(

[tim]

You've selected 1/5th of a second, and your lens only goes to F22, whereas it looks like you'd need F32 or smaller to correctly expose the image. I'd recommend reducing your exposure time to about 1/60th, to avoid motion blur of people, and if you need to increase your ISO to prevent underexposure.

[badrotation]

probably shooting with the smallest arperture your lens supports, thus over-exposing...

Is the arperture value blinking in the viewfinder when you were taking this photo? If so, that is the cause.


When in Tv, the arperture value will flash when the resulting image will be either over exposed, or underexposed.

[felix21685]

tim and badrotation are right.

and you are right also ..when you select TV it will automatically chose the aperature for you.
but your lens can only close its blades so much. Therefore the slow SS of 1/5 will over expose.

[ed2day]

If you are going for motion blur with the slow shutter speed, then you will need a neutral density filter to avoid overexposing. A polarizer, if you have one, may do in a pinch. There's just more light than the camera/lens can handle at that shutter setting. Looks like the idea was right--would have been a cool shot.

[elkootcho]

Thanks for the advice. I will absolutely keep that in mind next time. I guess the limitations of the kit lens are showing. The only other lens I had with me was the 75-300 IS and obviously that was too long when sitting so close to my wife and daughter. Oh well, can't win them all!!!

[lostdoggy]

Couple of hours with PS will straighten it all up!!!

[Exu]

Couple of hours with PS will straighten it all up!!!


He's a graphic designer so maybe that would take him only a couple of minutes.

[Titus213]

Hey, it's an interesting shot as is....

[mikeymike]

i agree withTitus

[felix21685]

did u shoot it raw or jpeg ?

[MTalley]

Not necessarily a problem with the kit lens, other than the fact that f/22 is probably the smallest aperature it will support, say, compared to another lens.

In this instance, some strong neutral density filters would have been the answer. Or, wait and come back just after the sun sets and the light is low.

[robertwgross]

did u shoot it raw or jpeg ?

The answer to that is in the original post.

---Bob Gross---

[markubig]

I guess the limitations of the kit lens are showing. i don't believe the result you got had anything to do with the limitation of the kit lens. i just think it had to do with your understanding of how to properly expose the picture you wanted, given the light that was available.

[tim]

i don't believe the result you got had anything to do with the limitation of the kit lens. i just think it had to do with your understanding of how to properly expose the picture you wanted, given the light that was available.

The kit lens only goes to F22, my Tamron 28-75 and Canon macro go to F32, which would have helpedin this situation.

[markubig]

The kit lens only goes to F22, my Tamron 28-75 and Canon macro go to F32, which would have helpedin this situation.goes to show what i knowhttp://www.photography-on-the.net/forum/images/smilies/icon_redface.gifhttp://www.photography-on-the.net/forum/images/smilies/icon_redface.gif . . . thought my tamron capped at f22 . . . in fact, i thought all lenses capped at f22 . . . http://www.photography-on-the.net/forum/images/smilies/icon_redface.gifhttp://www.photography-on-the.net/forum/images/smilies/icon_redface.gif

[tim]

I only know because when I clean my sensor I use the Tamron to check it, at F32.

[mkh]

This is not a problem witht he kit lens. Any lens would have exhibited this problem at 1/5 second if the lense couldn't stop down below f22. In your case the view finder should have had the shutter speed flashing. Something should have flashed.

Also 1/5 is really slow. I know I can't hand hold at that speed and get sharp images.

[tim]

This is not a problem witht he kit lens. Any lens would have exhibited this problem at 1/5 second if the lense couldn't stop down below f22.

Absolutely true, but but also quite obvious. All my good quality lenses (ie everything other than kit) go beyond F22 AFAIK. Not that I use F32 often, or ever for that matter.

[elkootcho]

He's a graphic designer so maybe that would take him only a couple of minutes.

I wish that were possible. You can't fix what doesn't exist. There is absoluely zero data in the blown out portions - just pure white.

i don't believe the result you got had anything to do with the limitation of the kit lens. i just think it had to do with your understanding of how to properly expose the picture you wanted, given the light that was available.

After reading all the posts it seems that to get this shot with the kit kens at the time that it was taken (early afternoon, bright day) a ND filter would be required. Either that or shorter shutter speed but I really wanted a lot of blurring in the background.

Thanks for all the comments, they all really helped and make me think a bit more. Live and learn!!

[Curtis N]

Just for yuks,
Let's assume elkootcho was TRYING to get motion blur with his 1/5 shutter speed.
The other strategy would be to use Av mode, stop the lens down all the way (f/22) at ISO 100. The camera will choose the shutter speed, and it will be the longest shutter duration possible given the limitations of the camera and the lens. You could also "pull" it a little by dialing in maybe +1 stop exposure compensation (would double the shutter duration) then adjusting the exposure down with the RAW converter. The exposure comp could potentially blow some highlights though.

[ed2day]

Elkootcho--
I think what you need to take from this, apart from what you stated, is that the camera had to have given you a warning that it could not capture a proper exposure and you need to keep an eye out for it. At least the f value should have been blinking and --not positive on this one-- I don't think you get an audible beep. I understand though, shots like that you don't always have time to make sure everything's in order.