Thanks useful information: 
(Nikon D7000...18-105 lensy thingy on the front of the camera) regardless of what mode you are in (auto or manual) when you zoom in or out the fstop read out changes.... i.e. zoom out - fstop gets lower. Now, I understand that the lower the fstop, the bigger the aperture size, more light gets in but the depth of field is shortened..... but why does zooming (in/out) effect your aperture read out /display reading?? I though by setting the fstop, you SET the amount of light you want to get to the sensor... so why does it change when adjusting zoom.....??? Zoom is just framing your picture at the end of the day... Does that then effect your depth of field??.... or is that a dumb question..?
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