Understanding effective focal length for EF-S lenses

Started Feb 20, 2009 | Discussions thread
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iMac, therefore iAm Veteran Member • Posts: 8,413
This was never an issue before digital

The fact is, there has ALWAYS been conversion factors with cameras because cameras have always had different size sensors. 8x10 large format, medium format, 35mm, 110, etc. But you NEVER heard someone say "What focal length do I need on my 35mm SLR to match my field of view from my Kodak Instamatic?" Or what focal length on Med Format to I need to match 100mm on 35mm?

Cedarhill wrote:

Suppose you have always used a P&S digital camera and you decide to
buy a DSLR. Wouldn't it be nice to be able to select lenses that will
cover the same field of view as your previous camera? Without any
kind of common standard, you would have no way of doing that. That is
the value of equating focal lengths of different cameras to some
agreed upon standard. You may not be interested in that sort of
comparison but I certainly was when I bought my first DSLR. I daresay
a lot of other people besides myself are also interested in that sort
of information.
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