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Program mode shift

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Offline mkmenuts

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Program mode shift
« on: 09 / February / 2008, 08:14:23 »
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Hi all,

Since the camera's P-mode usually gets the exposure right (may be corrected with exposure compensation), the main reason to use the S, A (Tv) modes is to select the right "Artistic Exposure" out of the (normally 6) available shutter and aperture combinations.

I suggest to use this (stealing the idea from Nikon, mind you):

P: Program Automatic Exposure Mode Shift


Use "P" for program auto exposure. In this mode the camera chooses the f/stop and shutter speed for you.

In order to get any aperture or shutter speed you prefer in this mode: simply move the zoom lever to shift them (after half-pressing.) This will select alternate combinations of f/stops and shutter speeds which give the same exposure. Nikon calls this "Program Shift." A *P symbol will appear (and lock the settings) on the bottom left of the viewfinder, to the left of the shutter speed.

Three easy ways to return to the standard program combination are to:

1.) flip to a different mode and back to P, or

2.) turn the camera off and back on, or

3.) spin the zoom lever back to its original position.

The *P symbol goes away when you've returned to the standard combinations.

The standard combinations are f/4 at 1/60, f/5.6 @ 1/125, f/8 @ 1/250, f/11 @ 1/500, etc.

A shifted set might use f/4 @ 1/1,000, f/8 @ 1/500 or might use f/4 @ 1/2, f/5.6 @ 1 sec, etc.

This will allow going for different apertures to control DOF, or different shutters according to subject type.

Looking for your comments...

mkmenuts

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Offline mkmenuts

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Re: Program mode shift
« Reply #1 on: 09 / February / 2008, 08:15:32 »
...One more comment:

For IXUS cameras, this will be useful to control the ND Filter as well, by allowing 2 Aperture values at each zoom position.

mkmenuts

Re: Program mode shift
« Reply #2 on: 09 / February / 2008, 13:05:14 »
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« Last Edit: 22 / April / 2008, 11:24:53 by Barney Fife »
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Offline GrAnd

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Re: Program mode shift
« Reply #3 on: 09 / February / 2008, 13:16:31 »
Already available on the S-series...
A-series also does have such feature in P mode by design.
SD-series does not have due to absence of iris diaphragm.
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Offline ewavr

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Re: Program mode shift
« Reply #4 on: 09 / February / 2008, 15:10:17 »
A-series also does have such feature in P mode by design.
Unfortunately, A6x0 cameras only  :(

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Offline GrAnd

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Re: Program mode shift
« Reply #5 on: 09 / February / 2008, 15:50:11 »
A-series also does have such feature in P mode by design.
Unfortunately, A6x0 cameras only  :(
Really? I've looked into A710 user manual and compared it with A610 - I have not seen any differences in this point.
« Last Edit: 09 / February / 2008, 16:02:12 by GrAnd »
CHDK Developer.

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Offline ewavr

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Re: Program mode shift
« Reply #6 on: 09 / February / 2008, 15:58:30 »
When I press "exposure lock" (half-shutter+erase keys) in "P" mode I see gray (not green) arrows around aperture/shutter values.

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Offline GrAnd

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Re: Program mode shift
« Reply #7 on: 09 / February / 2008, 16:08:14 »
When I press "exposure lock" (half-shutter+erase keys) in "P" mode I see gray (not green) arrows around aperture/shutter values.

Heh... The another feature which Canon blocked for marketing reason?
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Offline ewavr

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Re: Program mode shift
« Reply #8 on: 09 / February / 2008, 16:15:09 »
Heh... The another feature which Canon blocked for marketing reason?
Yes. I tried unlock this mode (by modifying some variables), but without success.

Re: Program mode shift
« Reply #9 on: 09 / February / 2008, 19:33:47 »
Quote
This will allow going for different apertures to control DOF, or different shutters according to subject type.

That's the real shortcoming of IXUS cameras:
There is no control over DOF, and 2 stops down by means of the ND filter is not quite enough for 'flowing water'.

However. program mode shift would be easy to realize here:
A single button press to flip the ND filter the other way and set +2EV or -2EV.

 

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