Quote:
Originally Posted by lukiwooki
Thanks! I'm learning something new here. I haven't really got to study my camera yet, so thanks for this new info. So that means, the lower the f-number, the greater the depth of field. The greater the focal length (mm), the wider the photo, is that correct?
So, is there any autofocus lens for D40 with f1.2 as well as a "longer telephoto"
Anyway, does telephoto mean the wideness of the photo?
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The lower the f/number (taken as a fraction), the bigger the DOF. For example, f/10 will have more DOF than f/4, which will have more DOF than f/1.8 (because 1/10 is smaller than 1/4 is smaller than 1/1.8).
The
shorter the focal length (in mm), the wider the photo. A 10mm lens will be ultrawide, 18mm will be wide, 35mm will be "normal" (on a DX or Crop camera), 55mm will be telephoto, etc. "Telephoto" basically means "long" (closer, zoomed in). "Wide angle" means what you think -- a very wide angle of view.
I don't think that there's an AF-S f/1.2 lens out from Nikon, but I would never get it anyhow. It would be all but impossible to take a photo with the right thing in focus! At f/1.2, the DOF is so tiny that even the smallest focus error will totally mess up your photo. The D40 just doesn't have a clear enough focusing screen to let you do such a thing -- never mind that you've never used a lens with such a huge aperture before.
The 35mm f/1.8 is a good start (and a bit more forgiving on the focusing front).