k20d auto ISO in TAv mode

wiyum · 08-07-2008, 02:46 AM

Hey all,

My k20d is set to use ISOs from 100-2000 in auto mode, but when I'm in TAv, it'll often stop at 1600, even though it tells me that 1600 is too slow. Stopping down often gets it to jump to 2000, which it also deems as too slow. My question is, since I'm shooting in low light and might just be willing to live with it being underexposed, is there any way to get the camera to give me that extra 1/3rd stop of help by jumping to 2000?

Will

tubadad · 08-07-2008, 06:24 AM

On the K10D you can limit Auto ISO to a range, check this out on the K20D and see if you have set Auto to have a max ISO of 1600. Also, the K10D has an Auto Exposure correction, if you have this as well, perhaps you have to turn it off.

wiyum · 08-08-2008, 01:36 AM

Yeah, I definitely set the range to 100-2000. I couldn't find auto exposure correction though.

Will

flyer · 08-08-2008, 04:53 AM

When set on "B", the camera auto ISO stops at 1600 (page 78 of K20D book). So maybe the electronic try to keep the ISO at 1600 to minimize noise.

Arpe · 08-10-2008, 06:08 PM

I use TAv mode extensively and do not have this problem with my K20D. Sorry. I have it set to 100-4500.

*janosh* · 08-11-2008, 10:21 PM

Originally Posted by Arpe

I use TAv mode extensively and do not have this problem with my K20D. Sorry. I have it set to 100-4500.

I've been curious about TAv...why do you use it and why set at 100-4500...

...in other words, what kind of photo situations are you dealing with this way?

*Venturi* · 08-11-2008, 11:13 PM

As someone else here explained a few days back, TAv mode is akin to shooting in full manual but switching film on the fly. You manually set your shutter and aperture with the e-dials, and the camera sets the ISO for the 'correct' exposure.

Arpe · 08-12-2008, 06:56 PM

Originally Posted by janosh

I've been curious about TAv...why do you use it and why set at 100-4500...

...in other words, what kind of photo situations are you dealing with this way?

Taking photos of rugby.
I know what my minimum shutter speed I want is.
I know what minimum aperture I want.
So I set, say 1/500 at f4.5, and let the camera figure out what ISO to use (it's faster than me at that). As conditions can change from second to second (clouds scuttling across the sky etc.) I need something on auto!
With a 3pm kick-off the game finishes at around 4:30pm. In winter, on a dark wet day, it can be very dark by the end of the game. By then I usually would have dialled back the shutter speed to 1/350 or even 1/250, and the aperture to f2.8, but the ISO will still be high.
Why ISO4500? Because it's better than no picture at all.

It's good because I have control over the things that really matter and let the camera do the rest. (I also dial in -0.5 exposure compensation, just seems to need it)

*janosh* · 08-13-2008, 10:22 AM

Thanks Arpe & Venturi... I need to explore this.

I also find N-.5 a good idea .. "N" is usually excessive in my contrasty light...might not be that way in flat light.

Originally Posted by Arpe

Taking photos of rugby.
I know what my minimum shutter speed I want is.
I know what minimum aperture I want.
So I set, say 1/500 at f4.5, and let the camera figure out what ISO to use (it's faster than me at that). As conditions can change from second to second (clouds scuttling across the sky etc.) I need something on auto!
With a 3pm kick-off the game finishes at around 4:30pm. In winter, on a dark wet day, it can be very dark by the end of the game. By then I usually would have dialled back the shutter speed to 1/350 or even 1/250, and the aperture to f2.8, but the ISO will still be high.
Why ISO4500? Because it's better than no picture at all.

It's good because I have control over the things that really matter and let the camera do the rest. (I also dial in -0.5 exposure compensation, just seems to need it)

reeftool · 08-13-2008, 11:59 AM

Originally Posted by janosh

I've been curious about TAv...why do you use it and why set at 100-4500...

...in other words, what kind of photo situations are you dealing with this way?

On partly cloudy days with quickly changing light and shooting a sports game where you would want a fast shutter and as much depth of field is where I use it. A nice feature.

Arpe · 08-13-2008, 06:18 PM

And even on sunny days when the players run from bright sunshine into the grandstand shadow, the camera reacts a lot faster than me!