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A DX Lenses
DX lenses are designed for use with DX format cameras and have a smaller
picture angle than lenses for 35mm format cameras.
If [Auto DX crop] is
off and [FX format (36 × 24)] or [5 :4 (30 × 24)] is selected for [Image area]
when a DX lens is attached, the edges of the image may be eclipsed.
This
may not be apparent in the viewfinder, but when the images are played
back you may notice a drop in resolution or that the edges of the picture
are blacked out.
A The Viewfinder Display
The DX format and 5 :4 crops are shown below.
DX format (24 × 16)
image circle
FX format (36 × 24)
image circle
DX format
5:4
FX format
DX format 5 : 4