I must choose the correct lens

image circle and frame for 35mm and aps-c

My current digital camera has an APS-C size sensor, in green above.  It is about the size of the seldom used APS format film.  It is not as large as 35 mm frame, in red above.   

APS-C sensor gets fully covered by even 35mm lens

I can use all my lenses on my current digital camera.  

image circle of aps-c lens does not cover the entire 35mm frame.

 I cannot, however; use all my lenses on the Elan 7 because I have bought lenses in recent years made exclusively for the APS-C sensor.  They would not cover the 35 mm frame.  I must remember not to use the wrong lens when shooting this film.  It adds another step of thinking that I must go through to plan a shot.

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