Yes Fx.x = f/x.x.
And yes F8 has a greater DOF than F2..
You can see the practical application of Depth of Field using the calculator here:.
Http://www.dofmaster.com/doftable.html.
As you can see there a 1.5x crop SLR body (like Canon 400D or Nikon D40,D80 etc ) has a DOF of about 1.6 ft at 50mm f2 and 6.2ft at 50mm f8..
The amount of zoom on your lens also affects Depth of Field. So to give you extremes:DOF on 200mm at f2 = 0.03 ft and at f8 = 0.3ft (!!)DOF on 18mm at f2 = 8.7 ft and at f8 = 4ft to infinity.
Chris Elliott.
*Nikon* D Eighty + Fifty - Other equipment in Profile.
Http://PlacidoD.Zenfolio.com/..
Sybren wrote:.
On my camera and in my manual, apertures are listed as Fx.x (wherex's are #s). In the glossary of this site, apertures are listed asf/x.x. Is Fx.x = f/x.x? If not, what's the difference?.
"f/x.x" is more correct, technically. "f:x.x" is also OK. The "F-stop" is a ratio of the aperture (diameter) of a lens to it's focal length (FL)..
Charlie DavisNikon 5700 & Sony R1CATS #25PAS Scribe @ http://www.here-ugo.com/PAS_List.htmHomePage: http://www.1derful.info'I brake for pixels...'..
One thing you don't readily find out on the internet is how the technical terms are pronounced. I really don't know whether other parts of the world differ, but I've always pronounced the term f/5.6 as simply "eff five point six". But I do consider the f/5.6 style to be the standard way of writing it down..
The other standard way, often found engraved on lenses, shows the maximum aperture something like this:"50mm 1:5.6".
The letter "f" does not appear at all. Generally this is used only to show the maximum (widest) aperture a lens has...
Sherwoodpete wrote:.
The other standard way, often found engraved on lenses, shows themaximum aperture something like this:"50mm 1:5.6"The letter "f" does not appear at all. Generally this is used only toshow the maximum (widest) aperture a lens has..
In this example f = 50 mm so is stated but in f/56 we mean the focal length divided by 56, surely?.
Regards, David..
The 1:5.6 means the diameter of the wide open aperture is 1/5.6th of 50mm..
Of course, I don't think there's any such thing as a 50mm lens with a maximum aperture of f/5.6. Even macro 50s do better than that...