Re: Easy newbie Canon Rebel XT 1st questions

All Things Mopar wrote:
> Today David J Taylor commented courteously on the subject at
> hand
>
>> I think Alan's page says a lot about the need for IS:
>>
>> http://www.aliasimages.com/KM7D_AS_Test.htm
>>
>> If you are forced into shutter speeds slower than
>> 1/<focal-length>, there is a risk of camera shake. That
>> risk is much reduced with IS - perhaps by 3 stops -
>> allowing a shutter opening time of 5 - 10 times what you
>> might otherwise require for a sharp image. This increase
>> in exposure time could either allow you to use the
>> hand-held camera at a lower light level, a smaller lens
>> aperture at the same light level, or a lower ISO (and hence
>> lower noise) at the same light level.
>
> How'd we go from 3 newbie questions to the perennial debate on
> proper technique? I have /no/ trouble with camera shake with
> flash or in daylight, and never have except when I shoot the
> Woodward Dream Cruise pre-cruise event at sundown. And, I
> haven't had the time to test my new toy at high ISO and see
> what shutter speed I get, so the question is moot. I
> understand IS and the First Amendment gives me the right to
> ignore it.
>
>> The visibility of noise is critically dependant on the
>> image viewing conditions, and the image size in pixels.
>> Are you using all 6MP or just displaying on the Web at 640
>> x 480? How big are you printing (if at all)? These factors
>> will determine what ISO you can use on the camera without
>> the noise becoming objectionable to you. Subjective, yes.
>> Sorry, but it is!
>
> I said a lot of complementary things about this NG, and you
> David. But, I neither need nor want a Photography 101 lesson.
> I am well aware of all this stuff, I've been take 35mm for 40
> years and digital for 5.
>
> I used to shoot at 1.6 MP, then went up to 5 but resized down
> to 3 in PSP 9 prior to editing. I used to save at 1280 x 960,
> not I usually go 1400 x 1050. Is that OK with you if I still
> do this with my new Canon? I certainly hope so. <grin>
>
> What is your issue with what I choose to do with my images? I
> know about the "rule of 200 PPI" and for me, it is bunk. I'm
> not going to debate this any further. I now know the answers
> to the 3 questions I asked, I have a modicum of experience
> with the XT, and I'll come back with more questions as they
> come up.
>
> See my sig, it says it all here...

Jerry - there's no argument, simply that some people will say "anything
over ISO 800 is hopeless because of noise". This usually comes when they
examine at 1:1 zoom. If these are not your own viewing conditions, then
be wary of what people say about noise at specific ISOs. At 1.5MP (1400 x
1050), you will be able to use a higher ISO for the same visible noise
level.

I'm not saying there's anything wrong (or right) about what you choose to
do with your images. I had thought you asked for more information about
noise, but I was mistaken. Oops!

David


.

Relevant Pages

  • Re: Easy newbie Canon Rebel XT 1st questions
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