Originally posted by jsherman999 Ah. As I suspected.
Originally posted by kh1234567890 The E believers know that E exists. It is worse than a religion ...
The believers have forgotten that there is no useful purpose to the term beyond FOV and even then the concept is fuzzy. Unless, of course you use Stieglitz's original sense for the term or are lobbying to support your personal choices for camera gear.
To fall into Jay's mode:
Buyer: I want a lens to photograph birds with
Seller: What format is your camera?
Buyer: I don't know. It is a EOS something ii that I got at Costco.
Seller: Oh, then it is probably cropped-format
Buyer: Cropped format?
Seller: Yes, you have to multiply everything by 1.6 to determine equivalence
Buyer: Equivalence?
Seller: Yes, equivalence to FF
Buyer: What is FF?
Seller: It is the format used by high-end Canon cameras that you cannot afford
Buyer: What does that have to do with a lens for birds?
Seller: Everything! All discussions of sensors and lenses in interchangeable lens photography reference high-end Canon cameras that you cannot afford, except for even more expensive medium format and large format cameras. The owners of those cameras don't need equivalence.
Buyer: OK, what lens do I need?
Seller: You need a 480mm equivalent lens at minimum
Buyer: I looked at the Canon catalog and did not see any 480mm lenses. Am I missing something?
Seller: Just take a 300mm lens and multiply by 1.6
Buyer: OK, you say so, just sell me the lens
Seller: Do you want the f/2.8 or f/5.6 version. It is important to remember that the f/2.8 is DOF and resolution equivalent to...
End of conversation
Steve
(...I like and respect Jay immensely, though I don't really understand the importance of all this. I guess it is because I shoot medium and large format too...)