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12-29-2014, 01:59 PM   #1
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Operational difference between TAv and M+Auto-ISO?

I almost always use TAv since I'm concerned about both motion blur & DOF. TAv seems the same as M+Auto-ISO. Has anyone noticed any operational differences between these two exposure modes?

Dan.

12-29-2014, 02:02 PM   #2
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QuoteOriginally posted by dosdan Quote
concerned about both motion blur & DOF.
Why not just learn to use full on Manual Exposure mode?
12-29-2014, 02:10 PM - 1 Like   #3
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QuoteOriginally posted by r0ckstarr Quote
Why not just learn to use full on Manual Exposure mode?
With M-series lenses, I usually use M or M+Auto-ISO.

With my Super Takumar 50/F1.4 M42 lens I use M, M+Auto-ISO, or Av.

But most of my shooting these days I shoot sports in TAv with two AF lenses, DA* 60-250/F4 SDM & Sigma 70-200/F2.8 HSM II.

Dan.
12-29-2014, 02:14 PM   #4
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The only difference is the ability to dial in some exposure compensation.

12-29-2014, 02:14 PM   #5
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QuoteOriginally posted by dosdan Quote
I almost always use TAv since I'm concerned about both motion blur & DOF. TAv seems the same as M+Auto-ISO. Has anyone noticed any operational differences between these two exposure modes?
Is auto-ISO an option in M on Pentax?

Anyway, I think the main (only?) difference between the two is that TAv makes sense. To me it sounds illogic to have auto anything in manual mode.

Edit: Ah, didn't know that about manual lenses. I need to investigate
12-29-2014, 02:21 PM   #6
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QuoteOriginally posted by dosdan Quote
I almost always use TAv since I'm concerned about both motion blur & DOF. TAv seems the same as M+Auto-ISO. Has anyone noticed any operational differences between these two exposure modes?

Dan.
They are essentially the same. On lower-end bodies, M mode with auto ISO is actually displayed as TAv, since the mode dial lacks that setting.

Adam
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12-29-2014, 02:30 PM   #7
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QuoteOriginally posted by savoche Quote
Is auto-ISO an option in M on Pentax?
It is on the K100D Super. This does not have a TAv mode.

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12-29-2014, 02:33 PM   #8
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QuoteOriginally posted by dosdan Quote
It is on the K100D Super. This does not have a TAv mode.
Ok, thanks for the clarification. I learn something from the forums every day.

12-29-2014, 02:36 PM   #9
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QuoteOriginally posted by Adam Quote
They are essentially the same. On lower-end bodies, M mode with auto ISO is actually displayed as TAv, since the mode dial lacks that setting.
Thanks, Adam. looking at the DSLR comparator, it seems that the K10D was the first model with TAv on the AE dial.

Dan.

---------- Post added 30-12-14 at 07:43 ----------

QuoteOriginally posted by savoche Quote
Ok, thanks for the clarification. I learn something from the forums every day.
Beside the K100D Super, the only Pentax which I own that doesn't have TAv is the K-01. I use the K-01 a lot with MF lenses.

Ah, forgot about the Q. (The kids mainly use it.) It doesn't have TAv either.

Dan.

Last edited by dosdan; 12-29-2014 at 02:46 PM.
12-29-2014, 02:56 PM   #10
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We know TAv mode supports exposure compensation on k-5/IIs and k-3. But there is no M mode with auto-ISO in those cameras. There is possibility that M mode auto-ISO works the same as TAv except exposure compensation. My k-01 has M mode with auto-ISO but it is difficult to test/show if the metering is affected by exposure compensation. We know that Nikon had M mode with auto-ISO, again, not sure if exposure compensation can alter the metering.
12-29-2014, 03:04 PM   #11
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Doesn't auto iso in M mode mean that non-A lenses only shoot wide open?
12-29-2014, 03:07 PM   #12
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QuoteOriginally posted by dosdan Quote
Beside the K100D Super, the only Pentax which I own that doesn't have TAv is the K-01. I use the K-01 a lot with MF lenses.
The K-01 will indicate TAv on the LCD when in M mode with auto iso

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12-29-2014, 03:21 PM   #13
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QuoteOriginally posted by dosdan Quote
Beside the K100D Super, the only Pentax which I own that doesn't have TAv is the K-01. I use the K-01 a lot with MF lenses.

Ah, forgot about the Q. (The kids mainly use it.) It doesn't have TAv either.
It may not be written on the mode dial, but if you put the K-01, Q, Q10 or Q7 in manual with auto ISO, the mode displayed in the LCD is TAv. All that is missing is exposure compensation, because that button is used to switch the e-dial between shutter speed and aperture adjustment.
12-29-2014, 03:40 PM   #14
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I may be wrong on this, but I'm pretty sure on my K3, TAv steps ISO in 1/3 EV steps even if your actual ISO steps for other modes are set to full step. I find that quite a nice feature.

Auto iso in manual mode may do this as well, I am new to the k3 and haven't tried auto iso in manual mode.
12-29-2014, 03:43 PM   #15
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QuoteOriginally posted by Sandy Hancock Quote
It may not be written on the mode dial, but if you put the K-01, Q, Q10 or Q7 in manual with auto ISO, the mode displayed in the LCD is TAv. All that is missing is exposure compensation, because that button is used to switch the e-dial between shutter speed and aperture adjustment.
That is correct, except that Nikon's version of TAv mode is also M mode with auto-ISO, I wonder if someone who has the Nikon DSLR can verify if its M-auto ISO can support EV as well.
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