K100D Auto ISO limitation?

[Ed_T]

I read that when using exposure compensation, Auto ISO cannot be used.

If this is true, isn't this a serious limitation? Ouch. I'll have to check my DL.

http://www.geocities.com/ricehigh/K100D/RiceHighs_Pentax_K100D_Full_Review.html#Design_Pros_Cons

click Design Pros and Cons

Hope the K10D ain't gonna be like this, if true.

 

[MPrince]

In what way is it a serious limitation? Why let the camera decide the iso anyway? I would think the photographer would prefer to select the iso.

I don't know if it is true or not. UPS will be delivering my k100d to me later this morning.

I do know that when I get it, I will decide what iso to use, not the camera.

 

[dlkitch]

It be true. If you use EV comp, auto iso will not work....dlk

 

[Roland Mabo]

I have never found this to be a limitation.
With Auto ISO on, the camera controls the EV.
When you use exposure compensation, you control the EV.
You can't have both automatic control and manual control of EV at the same time.
It wouldn't be logical, as Mr Spock would have said.
EV = Exposure Value.

Take care
R

 

[philzucker]

Since logic was mentioned ... ;-)

With Auto ISO on, the camera controls the EV.

With Auto ISO off, the camera also controls the EV. In fact Auto ISO has no influence on the EV - only on the shutter speed and aperture chosen in P, Av and Tv modes. Auto ISO ups the ISO in given limits to facilitate handheld shots.

When you use exposure compensation, you control the EV.

When you use exposure compensation, you add or subtract from an EV the camera still controls.

You can't have both automatic control and manual control of EV at
the same time.

Since the exposure compensation works in P, Av and Tv modes - all modes that have EVs controlled by the camera - it would be just another round of processing: First EV is determined by the camera; then EV compensation is added/subtracted; then ISO, shutter and aperture is chosen in the same way as if EV comp wasn't active. Why should this be problematic?

Or am I missing something?

--
Phil

GMT +1

 

[MPrince]

Logic works like this:

The camera controls EV.

The photographer controls the camera.

Therefore, the photographer controls EV.

 

[philzucker]

The camera controls EV.

The photographer controls the camera.

Therefore, the photographer controls EV.

LOL! Would add an "if" clause to the second sentence to make it more realistic ;-)

--
Phil

GMT +1

 

[Peter Nelson]

--
Artist Eye's

Good one!

 

[GossCTP]

In what way is it a serious limitation? Why let the camera decide
the iso anyway? I would think the photographer would prefer to
select the iso.

I don't know if it is true or not. UPS will be delivering my k100d
to me later this morning.

I do know that when I get it, I will decide what iso to use, not
the camera.

It's a great feature and its a shame that the EV comp turns it off. If your going to let the camera select your Av or Tv, then why would the ISO be any different?
--

We should be careful to get out of an experience only the wisdom that is in it—and stop there; lest we be like the cat that sits down on a hot stove-lid. She will never sit down on a hot stove-lid again—and that is well; but also she will never sit down on a cold one any more. - Mark Twain

 

[MPrince]

The camera controls EV.

The photographer controls the camera.

Therefore, the photographer controls EV.

LOL! Would add an "if" clause to the second sentence to make it
more realistic ;-)

--
Phil

GMT +1

You're right, my logic structure here is deficient. It should probably read

IF statement 1

AND IF statement 2

THEN statement 3

 

[Michael Barker]

I don't like it. I wish auto would work with e.c.

If I dial up exposure compensation, that means I want a brighter picture, period. It does not mean I suddenly want to control other parameters. It just means that I disagree with the programmed metering choice.

The other problem with it is that it causes ISO to be changed with no notification! There should be a warning showing that Auto ISO has been turned off therefore your ISO has just been changed from 800 (Auto) to 200 (Default). This is very non-intuitive.

Exposure compensation is perhaps the most understood parameter adjustment by beginners and it exists even on cell phone cameras where no other parameters exist. Turning off Auto ISO when this is used causes a complicated side effect which will result in blurry pictures.