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DX lens on a D800 - I am confused

Bulgakov

Winter Springs, US
97 posts

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Bulgakov Registered since 31st Oct 2006
Fri 12-Oct-12 06:29 PM

This wasn't even a topic that I thought I was confused about until I took a couple of photos today.

With my D800 set on Auto FX Crop, I took a picture. When I looked through the viewfinder, I could see the total area, and then I could see the smaller area inside that I assumed was the DX area. The cropped area was grayed out a bit. The RAW file size was about 19M.

I then turned off Auto DX Crop and took a photo with my 24-70 2.8 at 24mm. I switched lenses to the 12-24 DX and took another photo at 24mm. There was no crop area (as I expected) but the area covered in the photos was virtually identical. Additionally, both file sizes were about 40M.

I'm now confused. I guess I expected the DX lens to either produce a smaller size file or an image with a narrower field of view by 1.5X.

What makes a DX lens a DX lens and what effect does Auto DX crop have?If my file size and angle of view is identical from a dx to an fx lens it seems hard for me to justify selling the DX f4 to get the f2.8 FX, at least right now. I can continue to use my DX lenses on my FX and slowly upgrade.

Additionally, for example, if I were to place a 300mm lens (DX or FX) ON THE D800 and put it into DX mode, would I get the same photo as I would with a DX camera and a 300mm lens?

Sorry for the rambling question. If anyone can help me out of my confusion I would really appreciate it. Thanks.

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