Re: Focusing question

"Bob Kirkpatrick" <bob.kirkpatrick@[EMAIL PROTECTED]
> wrote in message 
news:5be1562b-109a-40a5-a91c-2983909ca333@[EMAIL PROTECTED]
>>
>
> There is a subtle point here.  You need to be able to focus your
> vision sharply on the underside / matte side of the focusing screen.
> If your screen has lines or focusing aids like a split or microprism
> then those lines or edges or even dust on the matte surface must be
> perfectly sharp.   Then focus the reflected image through the lens.
> If you cannot focus your eyes on the screen, the image cannot be
> brought into sharp focus at the correct place.  So use whatever
> correction combination that allows you to focus on the screen.  This
> is the whole point of diopter correction lenses for viewfinders and
> the reason I'm saving up for a PM45.
>

Thanks for the thoughtful response.