Re: Zone Plate Focus stringency

very good. thanks.

----- Original Message -----
From: Guillermo <penate@home.com>
To: <pinhole-discussion@pinhole.com>
Sent: Monday, October 29, 2001 2:34 PM
Subject: Re: [pinhole-discussion] Zone Plate Focus stringency

>
> ----- Original Message -----
> From: "TSHACK" <TSHACK@SILVER-BAYOU.COM>
>
> > That was going to be my question.
>
> When you focus a lens using a ground glass, you are just making coincide
> the -ideally- flat image the lens is projecting with the surface of the
> ground glass, if you remove the ground glass, your eyes can't see the
image,
> but the image is still there focused "in the air". If you take a loupe
and
> make its base coincide with that image "in the air", in other words, with
> the "Aerial Image", you will then see the the exact same image your film
> will see. This is best seen in axis with the lens. If your camera has
GG,
> remove it an install a piece of clear glass, this will allow you to rest
the
> loupe steady, otherwise, you will have to rely on your steady hand.
>
> Again, you will probably be surpriced of what you see.
>
> Guillermo
>
>
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Received on Mon Oct 29 19:10:22 2001