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08-25-2010, 07:20 AM   #1
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DAL 18-55mm 3.5-5.6 3.5 midway only

I have only had the K-x, my first SLR, for 3 weeks and have been experimenting, so please excuse my stupid questions.
I have been trying to set the maximum aperture to 3.5f at the widest angle of my 18-55mm 3.5-5.6 DAL lens but only 5.6f is selectable in aperute priority.
Being new to this level of photography I get confused.
The lens will contract in as I widen the view and the starts to move out once again as I continue to expand the view to the widest angle.
I can select 3.5f at the point where the lense is closest to the camera about half way through the zoom range but if If I move the lens to a wider angle the aperture changes to 5.6f.
Is this correct or am I missing something? Or is there is a fault with either the camera or the lens?
I suspect it is me I just do not know enough to understand what I am doing wrong.
Any response welcome.

08-25-2010, 11:38 AM   #2
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Welcome to the forum, don't worry too much about lens physically going in and out.

Just look through the viewfinder at the wide end (18mm) you will get a lot more in the picture and this will be the f3.5 end also. As you move towards the 55mm end the f5.6 will then come into play.
08-26-2010, 01:01 AM   #3
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I had another play last night and I could set 3.5f at 35mm in aperture priority mode and move the lens to 18mm with 3.5f staying; however as soon as I pre-focussed it jumps back to 5.6f! Undeterred I changed to manual mode and set the lens to 18mm and I was able to set 3.5f in this mode and pre-focus without it changing. So I then changed back to aperture priority and it now functions as I would expect, setting 3.5f at 18mm changes to higher numbers as I zoom in and revduces back as I zoom out. I suspect this is a software bug?
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