Which lens is 35mm?

[vd853]

I'm looking to buy a lens that will match those used in a 35mm film cameras. What length should I be looking for in terms of EF and EF-S for my Canon 40D? I have no idea how to convert crop sensors.

 

[Big]

If I'm right, somewhere around 21mm. Take the mm of a full frame and divide it by 1.6 to find the mm of a crop sensor. The 40D should be a 1.6 crop ratio.
Say for example, a 50mm on a 40D (crop sensor) will be about the equivalent of 80mm on a full frame. 50x1.6=80

 

[Overread]

I'm confused as to what you are after - what is a 35mm film camera lens - since a 35mm SLR camera has interchangable lenses. Unless you are refering to a set lens on a 35mm camera body then you would have to state the focal length of that lens.

Also EF and EFs lenses give you the same focal length as each other. The only difference is that an EFs lens has less glass since it does not need to produce as large an image (since a crop sensor camera body crops away the edge of the image from an EF (fullframe compatable) lens).

 

[matfoster]

yes 21mm: 21 + (6 x 2.1) = 33.6mm equiv.
or maybe find a 24mm prime...38.4mm equiv.