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09-13-2010, 09:23 AM   #1
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Dream feature for Pentax K-7 Green Button in TAv

Hi.
When shooting in TAv mode, one can program the Green Button to give you a quick appropriate exposure as either the Program Line, Tv-Shift or Av-Shit. I use Program Line, but the problem is that in low light the priority for the shifts is such that one may end up with very slow shutter speed - and ruined picture as a result.
I guess using Av-shift mitigates the issue for low light, but then in high light one is liable to run into the opposite problem - getting very high f-stops.
Wouldn't be possible to restrict the lowest shutter speed to some user-specified number - say, 25 or 30? That would mean, optimize the Tv and Av values, but not unconstrained?
I think this could be something that could be added in firmware.
Any other ideas how to work around the issue?

09-13-2010, 10:58 AM   #2
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You can try and change the program line to fast moving target:

- Turn on camera
- Press info button
- Select the icon at the top left corner under the (Auto) ISO bar
- Turn the rear wheel so you see a fast running person icon

It may not do what you want but it will try to use a faster shutter speed.

- Bert
09-13-2010, 11:50 AM   #3
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Yeah, Bert, I thought about this as well, but it is indeed not exactly what I want (well, nothing in the current firmware is)
But the idea is similar. Just let the user prioritize the parameters of the optimization
09-13-2010, 12:58 PM   #4
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I think you may have misunderstood the Tav mode.

This mode gives you user selectable shutter speed and aperture, while the system corrects exposure by selecting the appropriate ISO value with that.
The general idea is that you are in control, and setting A and V, not the camera.
Yes, I know that the green button is setting values to a P style point, but Tav is not about automation, it is about user control.

If you are looking for a camera mode where the camera sets all values depeding upon a certain scene type, you will be better of buying a K-x/r/m.
These models have a number of scene modes you may be looking for.

Cheers, Bert

09-13-2010, 01:13 PM   #5
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Bert, I can see why you'd think so - I did not explain that the use of Green Button for me is not for regular shooting but for situations where one needs quick correct exposure AND doesn't have time to adjust the exposure in the parameters of the TAv mode.
I do like the user control and in fact was shooting in Manual all the time when I had *ist Ds.
09-13-2010, 01:13 PM   #6
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QuoteOriginally posted by bymy141 Quote
You can try and change the program line to fast moving target:

- Turn on camera
- Press info button
- Select the icon at the top left corner under the (Auto) ISO bar
- Turn the rear wheel so you see a fast running person icon

It may not do what you want but it will try to use a faster shutter speed.

- Bert
I was wondering if there could be a way to tweak that in Av or Tv ... nothing available under those modes, right?

JP
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