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Old Sep 28, 2010, 3:12 AM   #1
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Default My new Pentax Kx - Av mode ????

First off, is there something wrong with my brand new Kx?


Okay, in AV mode, using just the viewfinder (and not LV), I'll set (for example) the F to 5.6, and if shutter speed automatically adjusts to say 1/30..........when I switch over to LV, the shutter speed will change to 1/15 and give a brighter (and usuallybetter) picture.

Why is the Shutter speed changing when I switch from viewfinder to LV in AV mode?
Is this normal?

Anyway, this is my very first DSLR, and after reading a couple of books (The Digital Photography Book Vol 1 & Understanding exposure) I ventured out today for the very first time to take a few pictures.

These were taken aprox 20 min after sunset and it was overcast.

I took them in AV mode with the 18 - 55 kit lens on a tripod
I messed around with all the settings until I was able to get these shots which looked pretty close (maybe a bit brighter, especially the sky) to what I was actually seeing with the naked eye.

The first gazebo shot has the WB set to cloudy (for a warmer shot) and the second to auto.

I'm having a blast learning!



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Old Sep 28, 2010, 8:49 AM   #2
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The first shot was taken at 10 seconds, f/18 and an Exposure Bias Value of -0.7EV.

The second shot was taken at 15 second, f/22 and an Exposure Bias Value of -1EV.

There's a lot more that's different here than just the fact that one was shot with the OVF and the other was shot with LV.
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Old Sep 28, 2010, 3:26 PM   #3
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Quote:
Originally Posted by TCav View Post
The first shot was taken at 10 seconds, f/18 and an Exposure Bias Value of -0.7EV.

The second shot was taken at 15 second, f/22 and an Exposure Bias Value of -1EV.

There's a lot more that's different here than just the fact that one was shot with the OVF and the other was shot with LV.
Yes, I know what the above shot's were taken at, but they have nothing to do with/and are completely separate from the examples I give in my question.
I didn't include any sample shots that pertain to the issue I'm having switching between viewfinder and LM.

Thank you!
Dominick

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Old Sep 28, 2010, 3:36 PM   #4
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a samples of the original question would be good, to help figure this out.
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Old Sep 28, 2010, 4:05 PM   #5
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Quote:
Originally Posted by Braciola View Post
I didn't include any sample shots that pertain to the issue I'm having switching between viewfinder and LM.
Could you please?
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Old Sep 28, 2010, 4:41 PM   #6
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Okay, I just took these two pictures in AV mode on a tripod.
The ONLY thing I did different between the two is switch from LV (first picture) to viewfinder (second picture)
The camera took it upon itself to change the shutter speed.

I can't figure out why this is happening.



Last edited by Braciola; Sep 28, 2010 at 4:44 PM.
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Old Sep 28, 2010, 4:49 PM   #7
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Yeah, there is a different. In Liveview the metering seems works a little differently then the metering with the ovf it seems or the programing make the liveview expose longer.
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Old Sep 28, 2010, 4:51 PM   #8
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It might be normal, but I will not be able to check till the weekend.
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Old Sep 28, 2010, 4:57 PM   #9
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Quote:
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It might be normal, but I will not be able to check till the weekend.
Thanks shoturtle,

If there is something wrong with the camera, then I'm going to have to return it for another.
I got it from amazon, so I still have some time left to figure out if this is "normal" for the camera to be doing.

Thanks again!
Dominick
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Old Sep 28, 2010, 5:24 PM   #10
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I will be borrowing my brothers camera this weekend, and will check it out. But from my iso testing I did with it back in march. It seem normal. The AE seems to be tied to the different AF system. The liveview seems to need a bit more light with the contrast base system, vs the ovf and the phase detect system.
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