Hi,

When I see a LF focal length, I usually multiply
that focal length by .30 in order to get its
equivalent in 35mm.

For example, a LF lens with a 150mm focal length
will be multiplied by the .30 factor to get the 35mm.
equivalent, that is 45mm.

However, I was reading a conversation on the
internet and a guy mentioned that it is not .30
the right factor to multiply by, but .27.

That would give a LF lens of 150mm. a focal length
of 40.5mm.

Which of the two factors is right? Which one have
you be using?

Thank you, kind regards!