Actually you gain, or lose, depth of field, based entirely on the size
of the aperture, if you look at the math, that fact is pretty apparent.
Smaller aperture equals smaller CoC implies greater DoF.
Light transmission, to simplify things, depends on the f stop which is
as we all know, the ratio of the size of the lens opening to focal length.
Which is what promotes the idea that larger, (numbered), f stops and
shorter focal lengths give greater DoF.
So I'll modify my comment in the last post.
The author of the piece, isn't an just an idiot, he's an ignorant idiot,
with a very high opinion of himself.
By the way, the author, also displays an astounding ignorance of the
inverse square law, which is central to pretty much every rule of
correct exposure, in photography.
On 5/26/2015 8:37 AM, J C OConnell wrote:
you dont gain depth of field as the sensor gets smaller, you only gain
depth of field when you change the lens to a shorter focal
length to give the equiv angle of view on the smaller sensor.
JCO
On 5/26/2015 8:12 AM, Bill wrote:
On 26/05/2015 4:34 AM, james wrote:
While reading the photography part on flipboard (Smart phone app) A guy
named Dzvonko Petrovski is talking about crop v full frame sensors.
Edited quote:
A 50mm F2 lens on full frame is as expected a 50mm F2. On a 1.5 crop
sensor, it is a 75mm F3.
Link here:
http://www.lightstalking.com/?s=camera+sensor+size
Huh???????? A lens gets darker on a crop sensor????
James
I was hoping the equivalence debate would never make it's way to the
PDML.
The lens doesn't change, however you gain depth of field as the
sensor gets smaller. The equivalence nimrods dwell on that number,
completely ignoring that the maximum aperture of a lens is determined
by the manufacturer, not the format it is put in front of.
Please direct further inquiries to DPReview. They have people there
who have nothing better to do with their lives than make entire
mountain ranges out of this molehill.
bill
--
I don't want to achieve immortality through my work; I want to achieve
immortality through not dying.
-- Woody Allen
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