Assertion: effective aperture | /r/CapableOf | appear to be 50mm wide
Facets:
value: regardless of the fact
type: OTHER
Source sentences:
text: For instance, if you have a 200mm lens and want an aperture of f/4, the effective aperture needs to appear to be 50mm wide, regardless of the fact that due to magnification between the front element and the diaphragm in conventional designs the actual width of the diaphragm is usually smaller.