Basically all I wanted to know is ... "will more stuff fit into the picture with a 14mm (non DX) lens than with an 18mm DX lens, on a DX camera?"
Simple yes or no ... I'm assuming "yes" based on the feedback above.
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Others have already answered in some way, but it seems that the OP is still confused and/or in search of an answer...
Hoping to not add confusion, let a beginner-dilettante (myself) try to be of help:
The answer to your question is YES, but not because the 14 mm is non DX and the 18mm is DX.
The answer is yes "the 14mm does fit more stuff than the 18mm one" because a shorter Focal Length lens has a wider angle of view than a longer one.
Explanation:
a- "more stuff fitting into the picture" (angle of view) does NOT depend on the DX or not DX type of the lens mounted on the same camera
b- on the same camera, a 14mm lens does always "fit more stuff into the picture" than a 18mm one, independently of the DX or FX type of the lens.
The angle of view of a 14mm lens is wider than that of a 18mm one
c- the angle of view of a (e.g.)
whatever 14mm lens on a DX camera is equivalent to that of a 21mm(14*1.5) mounted on a FX camera
Added for hopefully further clarification:
If you buy for your DX camera (1.5 "crop factor") a given lens and you want to know the FX (35mm) Focal Length equivalent angle of view, you have to multiply by 1.5 the focal length of the lens you are considering, being it a special one for DX or not. So, on a DX camera you have
always to multiply the Focal Length by the "crop Factor" 1.5.
You have to judge the opportunity to buy a DX lens v/s a non DX lens on other factors than the Angle of view (on the same camera, same Focal Length = same Angle of View).
Hope to not have written anything wrong or confusing.
Cheers