Y'all can go all sci-ency and prove either side of the argument. It still
boils down to "Do you need it? Or do you just WANT it?"
There's a difference.
I want it!
On 9/8/2014 12:33 PM, Bryan Jacoby wrote:
The other side of the coin is that, to produce the same picture (same
depth of field and shutter speed), the full frame camera will only be
getting half as many photons per unit area, so has to shoot at 2x the
ISO of the crop camera. So the common wisdom that you get a stop
extra ISO out of a full frame camera is true but misleading, because
you _need_ a stop higher ISO on full frame to produce the same image
as you would with an APS-C camera.
On Mon, Sep 8, 2014 at 12:27 PM, Bryan Jacoby <[email protected]> wrote:
On Mon, Sep 8, 2014 at 10:11 AM, Darren Addy <[email protected]> wrote:
To try to find lenses that still give you that focal length and
maximum aperture becomes an expensive proposition, when it is possible
at all.
Extreme example: DA* 200mm f2.8 can be bought for under $1K. (More
like $700, used) 300mm equiv. FOV on APS-C
Move to a full frame, now you need a 300mm f2.8 to replicate that FOV.
Price one of those lately? A Sigma is $3400. A more reasonable choice
would be a 300mm f4. You've replicated the FOV, but lost a full stop
of light.
Not really (I mean about losing the stop of light). It's true that
f/4 on full frame will only produce an image half as bright on the
sensor compared to f/2.8 on APS-C, but that's half as bright in the
sense of photons per second _per unit area_. The full frame sensor
has a little over twice the area, so it will actually be collecting
slightly more photons per second _over the whole image_, which is what
actually matters (or, another way to think of it is they will both get
the same number of photons per second per pixel if the two sensors
have the same number of pixels). And a 300 f/4 on full frame would
have about the depth of field as the 200 f/2.8 on APS-C. So these two
scenarios are actually very comparable.
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Science - Questions we may never find answers for.
Religion - Answers we must never question.
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