Originally posted by guard_01:
i was wondering, the camera takes photograph through the view finder right? then what is the middle lens for and why do some photographers attacher a longer lens to it?
![](http://a.img-dpreview.com/reviews/NikonD40/Images/lensmount-d40.jpg)
sensor in a digital camera that records and process the images while in traditional film cameras the light will fall on the film negative when the camera shutter blades open and closes
![](http://www.steves-digicams.com/2006_reviews/s3is/s3_evf.jpg)
the view finder in cameras (esp useful in film cameras where the shooter frames the subjects before taking a shot)
![](http://www.steves-digicams.com/2006_reviews/s3is/s3_back.jpg)
now most digital cameras have LCD and what you see is what you captures so the viewfinder is just an additional/ backup function
![](http://www.steves-digicams.com/2007_reviews/d40/d40_side_lt.jpg)
i believe the middle lenses TS was writing about are the big longer lenses he/ she sees on some cameras. these are usually interchangeable lenses that provides added optical zoom / wide angle / special effects capabilities