[MF3D.FORUM:426] Re: fl/30

[Tloc54452@xxxxxxx]

In a message dated 2000/04/07 07:32:09, erker@xxxxxxxxxxxxxx writes:

>  If you are always viewing with the same lenses
>then you want the on-film deviation to be unchanged
>(2.7mm for MF w/ 80mm viewer lenses) when you change
>taking lenses.
>
>  If you are changing the viewing lenses to match
>the taking lenses then the OFD (in mm) needs to scale so
>that the angular deviation you view remains unchanged.
>So if you take with a 50mm lens and then view your
>MF with a 50mm lens you need to scale the 2.7mm OFD
>to 1.7mm to avoid eyestrain due to excessive angular
>deviation when viewing.

I couldn't have said it that well myself, but I was going
to try.

John B