The F7x7 has a different multiplier, you would want to use 3.9176
So the wide angle of the F7x7 of 9.7mm would be equivalent to:
9.7mm * 3.9176 = 38mm (the 35mm equivalent focal length)

Tom123 wrote:
> Shay --
>
> I'm familiar with the 4.875 multiplyer, and I've been wondering why
> my 707 lens has 9.7-48.5 inscribed on it, because that figures out
> to the 35mm equivelant of approximately 47mm to 236mm, instead of
> 38-190. And when shooting at full WA, the exif always shows a 35mm
> equiv. of 54mm! (I notice you use 8mm as your example, which gives
> the "proper" 35mm equiv. of about 38mm. Can my 707 lens be
> different?) Thanks.
>
> tom
>
>
>
>
>
> Shay Stephens wrote:
> > Just take the reported focal length and multiply by 4.875
> >
> > Example: 8mm * 4.875 = 39mm (the 35mm equivalent focal length)
> >
>
>
>

--
Shay

My Sony F707 & F717 Gallery: http://www.shaystephens.com/portfolio.asp
My F717 Observations: http://www.shaystephens.com/f717.asp