From: Pete D on

"Alan Browne" <alan.browne(a)FreelunchVideotron.ca> wrote in message
news:f39iq7$arh$1(a)inews.gazeta.pl...
> HEMI-Powered wrote:
>> Alan Browne offered these thoughts for the group's consideration
>> of the matter at hand:
>>>the_niner_nation wrote:
>>>
>>>>As per title, what is the difference between these 2 shooting
>>>>modes? According to the manual, both allow you to define or
>>>>set your own aperture whilst the camera sets a shuuter speed
>>>>to deliver a correct exposure...if thats the case, then why
>>>>are there 2 modes ro do almost the same thing?
>>>
>>>"P" mode makes an initial selection for you of both aperture
>>>and speed (based on metered light, ISO setting, max lens
>>>aperture and Canon's particular P algorithm) and then lets you
>>>"program shift" as desired in either aperture or speed.
>>>
>>>"Av" locks the exposure speed according to your chosen
>>>aperture (and ISO setting). You vary the aperture only.
>>>
>>>On top of both of the above is the exposure-compensation that
>>>you enter to offset for the metering.
>>>
>>
>> I added Tv because it is a natural adjunct to the OP's overall question.
>> You correctly amplified my remarks by noting that ISO
>
> eh? I answered first, so you're the one amplifying... ;-)
>
>> modifies how all 3 modes will compute, and the camera's AE can be
>> overridden to at least +/- 2 stops. I don't do that much, but isn't that
>> EV?
>
> I didn't mention Tv as I thought the OP could make that leap of connection
> by himself...
>
> In the Canon world EV seems to be what everyone else calls "exposure
> compensation". In the real world EV is "Exposure Value" which is
> basically aperture & speed for ISO 100. (eg: Sunny-16 is EV 15 regardless
> of actual aperture and speed combo to achieve it).
>
> Your post correctly pointed out that P sets the shutter speed (or should)
> to reduce camera shake as well as the other factors I mentioned.
>
> Every time I use a Canon camera I am frustrated by its exposure system and
> it takes me many minutes to adjust. Minolta and Nikon is straight nuts
> and bolts terminology and usage. Pentax too IIRC.
>
> Cheers,
> Alan.
>

Pentax now also has two more modes on the K10D, Sv and TAv.


From: G.T. on
Alan Browne wrote:
> HEMI-Powered wrote:
>> Alan Browne offered these thoughts for the group's consideration
>> of the matter at hand:
>>
>>> the_niner_nation wrote:
>>>
>>>> As per title, what is the difference between these 2 shooting
>>>> modes? According to the manual, both allow you to define or
>>>> set your own aperture whilst the camera sets a shuuter speed
>>>> to deliver a correct exposure...if thats the case, then why
>>>> are there 2 modes ro do almost the same thing?
>>>
>>> "P" mode makes an initial selection for you of both aperture
>>> and speed (based on metered light, ISO setting, max lens
>>> aperture and Canon's particular P algorithm) and then lets you
>>> "program shift" as desired in either aperture or speed.
>>>
>>> "Av" locks the exposure speed according to your chosen
>>> aperture (and ISO setting). You vary the aperture only.
>>>
>>> On top of both of the above is the exposure-compensation that
>>> you enter to offset for the metering.
>>>
>>
>> I added Tv because it is a natural adjunct to the OP's overall
>> question. You correctly amplified my remarks by noting that ISO
>
> eh? I answered first, so you're the one amplifying... ;-)
>
>> modifies how all 3 modes will compute, and the camera's AE can be
>> overridden to at least +/- 2 stops. I don't do that much, but isn't
>> that EV?
>
> I didn't mention Tv as I thought the OP could make that leap of
> connection by himself...
>
> In the Canon world EV seems to be what everyone else calls "exposure
> compensation". In the real world EV is "Exposure Value" which is
> basically aperture & speed for ISO 100. (eg: Sunny-16 is EV 15
> regardless of actual aperture and speed combo to achieve it).

Actually, on a Rebel XT the button is labeled Av+-. And the manual
describes it as the Av/Exposure Compensation button. In manual mode it
is used to change aperture, and in other modes it's used to change EC.

I don't see EV mentioned anywhere.

Greg
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From: Alan Browne on
G.T. wrote:
> Alan Browne wrote:
>
>> HEMI-Powered wrote:
>>
>>> Alan Browne offered these thoughts for the group's consideration
>>> of the matter at hand:
>>>
>>>> the_niner_nation wrote:
>>>>
>>>>> As per title, what is the difference between these 2 shooting
>>>>> modes? According to the manual, both allow you to define or
>>>>> set your own aperture whilst the camera sets a shuuter speed
>>>>> to deliver a correct exposure...if thats the case, then why
>>>>> are there 2 modes ro do almost the same thing?
>>>>
>>>>
>>>> "P" mode makes an initial selection for you of both aperture
>>>> and speed (based on metered light, ISO setting, max lens
>>>> aperture and Canon's particular P algorithm) and then lets you
>>>> "program shift" as desired in either aperture or speed.
>>>>
>>>> "Av" locks the exposure speed according to your chosen
>>>> aperture (and ISO setting). You vary the aperture only.
>>>>
>>>> On top of both of the above is the exposure-compensation that
>>>> you enter to offset for the metering.
>>>>
>>>
>>> I added Tv because it is a natural adjunct to the OP's overall
>>> question. You correctly amplified my remarks by noting that ISO
>>
>>
>> eh? I answered first, so you're the one amplifying... ;-)
>>
>>> modifies how all 3 modes will compute, and the camera's AE can be
>>> overridden to at least +/- 2 stops. I don't do that much, but isn't
>>> that EV?
>>
>>
>> I didn't mention Tv as I thought the OP could make that leap of
>> connection by himself...
>>
>> In the Canon world EV seems to be what everyone else calls "exposure
>> compensation". In the real world EV is "Exposure Value" which is
>> basically aperture & speed for ISO 100. (eg: Sunny-16 is EV 15
>> regardless of actual aperture and speed combo to achieve it).
>
>
> Actually, on a Rebel XT the button is labeled Av+-. And the manual
> describes it as the Av/Exposure Compensation button. In manual mode it
> is used to change aperture, and in other modes it's used to change EC.

If you have and Av mode then it should mean that and having another
button labeled "Av+/-" seems like poor UI to me.

I may have made an error above, but the point remains that Canon have
one of the strangest exposure nomenclatures. Minolta had it just right:
A,S,M,P and exp-comp for both available light and flash. What more does
one need? (Drop the "P" and I'd be just as happy).

> I don't see EV mentioned anywhere.

HEMI wrote:
""modifies how all 3 modes will compute, and the camera's AE can be
overridden to at least +/- 2 stops. I don't do that much, but isn't
that EV?""

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From: G.T. on
Alan Browne wrote:
> G.T. wrote:
>> Alan Browne wrote:
>>
>>> HEMI-Powered wrote:
>>>
>>>> Alan Browne offered these thoughts for the group's consideration
>>>> of the matter at hand:
>>>>
>>>>> the_niner_nation wrote:
>>>>>
>>>>>> As per title, what is the difference between these 2 shooting
>>>>>> modes? According to the manual, both allow you to define or
>>>>>> set your own aperture whilst the camera sets a shuuter speed
>>>>>> to deliver a correct exposure...if thats the case, then why
>>>>>> are there 2 modes ro do almost the same thing?
>>>>>
>>>>>
>>>>> "P" mode makes an initial selection for you of both aperture
>>>>> and speed (based on metered light, ISO setting, max lens
>>>>> aperture and Canon's particular P algorithm) and then lets you
>>>>> "program shift" as desired in either aperture or speed.
>>>>>
>>>>> "Av" locks the exposure speed according to your chosen
>>>>> aperture (and ISO setting). You vary the aperture only.
>>>>>
>>>>> On top of both of the above is the exposure-compensation that
>>>>> you enter to offset for the metering.
>>>>>
>>>>
>>>> I added Tv because it is a natural adjunct to the OP's overall
>>>> question. You correctly amplified my remarks by noting that ISO
>>>
>>>
>>> eh? I answered first, so you're the one amplifying... ;-)
>>>
>>>> modifies how all 3 modes will compute, and the camera's AE can be
>>>> overridden to at least +/- 2 stops. I don't do that much, but isn't
>>>> that EV?
>>>
>>>
>>> I didn't mention Tv as I thought the OP could make that leap of
>>> connection by himself...
>>>
>>> In the Canon world EV seems to be what everyone else calls "exposure
>>> compensation". In the real world EV is "Exposure Value" which is
>>> basically aperture & speed for ISO 100. (eg: Sunny-16 is EV 15
>>> regardless of actual aperture and speed combo to achieve it).
>>
>>
>> Actually, on a Rebel XT the button is labeled Av+-. And the manual
>> describes it as the Av/Exposure Compensation button. In manual mode
>> it is used to change aperture, and in other modes it's used to change EC.
>
> If you have and Av mode then it should mean that and having another
> button labeled "Av+/-" seems like poor UI to me.

I completely agree.

>
> I may have made an error above, but the point remains that Canon have
> one of the strangest exposure nomenclatures. Minolta had it just right:
> A,S,M,P and exp-comp for both available light and flash. What more does
> one need? (Drop the "P" and I'd be just as happy).

I don't know why Canon has to do the Av, Tv thing, and why T instead of
S anyway?

>
>> I don't see EV mentioned anywhere.
>
> HEMI wrote:
> ""modifies how all 3 modes will compute, and the camera's AE can be
> overridden to at least +/- 2 stops. I don't do that much, but isn't
> that EV?""
>

Can't speak for HEMI but I was just talking about the manual.

Greg

--
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Dethink to survive - Mclusky
From: nospam on
In article <135joojcc0f2mf1(a)corp.supernews.com>, G.T.
<getnews1(a)dslextreme.com> wrote:
>
> I don't know why Canon has to do the Av, Tv thing, and why T instead of
> S anyway?

aperture value, time value
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