DX 35mm VS FX 35mm Focal Length
I often wondered, "Is the 1.5x crop factor real with "DX" sensors?" I set up a test to find out. Placing my sturdy Manfrotto tripod on our deck, I went about scribbling on half sheets of paper the lens and focal length being used. Here, I used "D" to signify a "DX" lens and the absence of the "D" indicates an "FX" ("full frame" or "film" et cetera) lens. The color images were shot with my Nikon D80 digital (DX sensor camera) using the same settings as on my N80 35mm film camera throughout the test (I forgot to kick the ISO down to 125, so they are a bit overexposed -- however, exposure or image quality was not the intent of this test). The black and white shots are scans from a contact sheet I made in the darkroom (hence the poor quality). So, in color is a DX sensor and black and white a flim (or FX like a D700, D3 (Nikon) or 5D, 1D (Canon)).
Here, the top is shot with my Nikkor 18-200mm DX zoom lens at a 35mm focal length. The bottom was shot with my Nikkor 17-35mm FX lens at 35mm. Notice the darkening of the edges is a bit less severe at 35mm with the DX lens that at 18mm with the DX lens in a different shot posted in this series. I did not do a test to see when the vignetting disappears completely, but I suspect it may be around the 200mm mark or higher.
DX 35mm VS FX 35mm Focal Length
I often wondered, "Is the 1.5x crop factor real with "DX" sensors?" I set up a test to find out. Placing my sturdy Manfrotto tripod on our deck, I went about scribbling on half sheets of paper the lens and focal length being used. Here, I used "D" to signify a "DX" lens and the absence of the "D" indicates an "FX" ("full frame" or "film" et cetera) lens. The color images were shot with my Nikon D80 digital (DX sensor camera) using the same settings as on my N80 35mm film camera throughout the test (I forgot to kick the ISO down to 125, so they are a bit overexposed -- however, exposure or image quality was not the intent of this test). The black and white shots are scans from a contact sheet I made in the darkroom (hence the poor quality). So, in color is a DX sensor and black and white a flim (or FX like a D700, D3 (Nikon) or 5D, 1D (Canon)).
Here, the top is shot with my Nikkor 18-200mm DX zoom lens at a 35mm focal length. The bottom was shot with my Nikkor 17-35mm FX lens at 35mm. Notice the darkening of the edges is a bit less severe at 35mm with the DX lens that at 18mm with the DX lens in a different shot posted in this series. I did not do a test to see when the vignetting disappears completely, but I suspect it may be around the 200mm mark or higher.