View Full Version : Aperture

02-23-2010, 03:32 PM
On my lens it says 1:4.5(22) - 5.6 Is that the aperture that this lens can do? If so then Ive noticed when I take a picture the aperture setting has gone up to F13 When the camera goes to F13 does the lense just go up to F5.6? Can someone just clarify this for me.

02-23-2010, 03:56 PM
Your lens range is f/4.5 to f/22 so your aperture will be able to shoot at any f/stop in that range such as f/4.5, f/5, f/5.6, f/6.3, f/7.1, f/8, etc. If I understand what your asking.

Here is a good article on F/stops if you want read more on it.

F-number - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/F-number)

02-23-2010, 04:48 PM
I would guess you have a zoom lens. If so the max/min aperture is dependent on amount of zoom so two low numbers are max for zoom in and zoom out and two high numbers are min for zoom in and zoom out.

If anything like mine I will admit not so easy to work out as no ring any more all done electric. But I can't see any lens not closing up to at least 16.

Mad Aussie
02-23-2010, 05:08 PM
Those numbers simply mean the widest possible apertures for that zoom lens. On a very good zoom lens it might only show 1 number ... like f2.8 for instance. This means that no matter what focal length you are using the lens will be able to use f2.8.

When it shows 2 numbers like yours f4.5 - 5.6 (and on my Canon L series 100-400) it means that at the lower end of the zoom ( in my case around 100mm ) I can get as wide as f4.5 but at some point through the zoom (focal length) I will only be able to go as low as f5.6.

Which is basically what eric is saying but in a different way.