Steve'sDigicams

mckennma · Apr 5, 2006, 10:18 AM

The 14-54 f/2.8 - f/3.5 works in this manner

Maximum Aperture: f2.8 Wide - f3.5 Telephoto - Minimum Aperture: f22

14mm starts at f/2.8 and goes out to f/3.5 at 54mm. It also can go to f/22. Is the f/2.8 to f/3.5 linear in nature?

Mikefellh · Apr 7, 2006, 1:31 PM

The reason for the changing aperture is so you won't get vignetting when you zoom...if it didn't change, you'd see the inside of the lens barrel in your pictures when you've zoomed in.

As for linear, don't know exactly what you mean by that...if you mean that plotting zoom vs. f-stop on a graph, you can find that out for yourself by taking pictures at every f-stop change; set your camera to aperture mode, set the zoom at 14mm, then set the aperture for f2.8 and take a picture...start zooming in until the f-stop changes and take another picture, and so on. Each picture will record the f-stop and position of the lens. Then you can plot it.

mckennma · Apr 7, 2006, 1:36 PM

Great idea. I have my 2GB Sandisk Extreme III CF coming today. I could do that. Adjust the camera from 2.8 to 3.5 at 0.1 intervals.

Mikefellh · Apr 8, 2006, 4:00 AM

This isn't something that needs to be done at full resolution...you could just use the lowest JPG resolution to do it...the images still record the full exif info for you to chart this.

mckennma · Apr 8, 2006, 9:47 AM

Just mea reasonto play with new toys.

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Apr 5, 2006, 10:18 AM	#1
mckennma Senior Member Join Date: Aug 2004 Posts: 134	The 14-54 f/2.8 - f/3.5 works in this manner Maximum Aperture: f2.8 Wide - f3.5 Telephoto - Minimum Aperture: f22 14mm starts at f/2.8 and goes out to f/3.5 at 54mm. It also can go to f/22. Is the f/2.8 to f/3.5 linear in nature?

Apr 7, 2006, 1:31 PM	#2
Mikefellh Senior Member Join Date: May 2004 Location: Toronto, ON, Canada Posts: 1,707	The reason for the changing aperture is so you won't get vignetting when you zoom...if it didn't change, you'd see the inside of the lens barrel in your pictures when you've zoomed in. As for linear, don't know exactly what you mean by that...if you mean that plotting zoom vs. f-stop on a graph, you can find that out for yourself by taking pictures at every f-stop change; set your camera to aperture mode, set the zoom at 14mm, then set the aperture for f2.8 and take a picture...start zooming in until the f-stop changes and take another picture, and so on. Each picture will record the f-stop and position of the lens. Then you can plot it.

Apr 7, 2006, 1:36 PM	#3
mckennma Senior Member Join Date: Aug 2004 Posts: 134	Great idea. I have my 2GB Sandisk Extreme III CF coming today. I could do that. Adjust the camera from 2.8 to 3.5 at 0.1 intervals.

Apr 8, 2006, 4:00 AM	#4
Mikefellh Senior Member Join Date: May 2004 Location: Toronto, ON, Canada Posts: 1,707	This isn't something that needs to be done at full resolution...you could just use the lowest JPG resolution to do it...the images still record the full exif info for you to chart this.

Apr 8, 2006, 9:47 AM	#5
mckennma Senior Member Join Date: Aug 2004 Posts: 134	Just mea reasonto play with new toys.