I tried to buy a new camera and after reading in the topic Is it true that at an opening to say f / 2. 4 on a digital camera, it would rate as around f/11 on a DSLR? Is it true about these “bridges” that cameras Panasonic Lumix FZ28? observed
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February 8th, 2010 at 11:18 am
The apertures are the same in digital as they are with a SLR.. and it does apply to the Panasonic FZ series of cameras. the aperture is found in the lens, not in the body of the camera.
February 8th, 2010 at 11:18 am
F/ stops are the same in any camera, while it’s the f/stop system, of course. Other measures of aperture exist, like the T stops, used in cinematography.
Possibly, what you heard, is that the Depth of field (DoF) of a compact camera @ f2.4 is equivalent to the aperture of a 35mm camera (a.k.a full frame) @f11.
This is more or less true, since, compacts and bridges have smaller sensors, that need lenses with shorter focal length. The longer the focal, less DoF it will have.
Both @ f2.8 will let in the same quantity of light, but the two cameras will have different DoF because of their different focal length of the lens.
If you look at the barrel of the lens of your FZ, it may say something like 28-300mm equivalent, but the true focal is much shorter eg: (2.8-20.6 mm). Most focals, are shown as if they were 35mm format focals. A 30mm lens on APS (DSLRs common sensor size) is equivalent to a 50mm in 35mm.
February 8th, 2010 at 12:14 pm
Um, yes but aperture effects two things, one being light, of which it will collect more light (but this camera needs more to work better) and the other being depth of field. Unfortunately although using a nice large aperture of f2.8 creates a small depth of field on the bridge camera this is counter acted because the sensor is closer to the lens and creates more.
So although it my technically have a larger aperture it doesn’t necessarily have any advantages of a DSLR.
February 8th, 2010 at 12:30 pm
basically, aperture is aperture for the purpose of exposure, regardless of the camera body. That’s why it works.
f/stop is a ratio between focal length and lens opening. No matter what the actual numbers are that used to determine that ratio, the result means the same thing every time. So an f/4 lens on a pocket camera and an f/4 lens on a medium format body will give you the same exposure value. The pocket camera will give much more depth of field, but that isn’t a part of exposure value.
February 8th, 2010 at 1:08 pm
There are two things that you need to consider. The effective aperture size, and the physical aperture size.
While on say the FZ28 the effective aperture is f2.4 will let through an equivalent of f2.4’s worth of light. Now because of the shorter focal lengths of these cameras size of the hole in the real world is smaller.
If you were to then put this same hole (exactly the same distance across) into an SLR then the aperture will then only let through f11’s worth of light.
So to have f2.4 on an SLR lens then you’ll need a much larger hole (I believe it will have 20.15x the diameter of the aperture of the smaller camera, this is because to gain one stop of light the aperture has to be doubled in size, and an f2.4 is 4.333 stops faster than f11)