----- Original Message -----
From: "Robert Meier" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: April 5, 2001 10:17 PM
Subject: Re:Pentax 6x7 Ext. Tube Exp. Adjustments
> I have gotten the helicoid extension tube to use with my 135mm
macro lens on
> the 6x7. I don't have the meter prism (I use the waistlevel)
and I don't
> know how much increase to give the exposure. Does anyone
have the table
> for this?
> Thanks, Bob
Pentax sez:
The Helicoid Extension Tube unit which fits to the inner bayonet
mount of the 6x7 camera and offers continuously variable
extension for precise control of image size. Range covered
equals that of the No.2 Auto Extension Tube at minimum
extension ant the No.3 Auto Extension Tube at maximum
extension.
Here is the exposure table for the Auto extension tube set for
the 135mm macro:
http://www.accesscomm.ca/users/wrobb/135Macro.jpg
You will have to come up with your own median values. Remember,
light fall off is an inverse square proportion to extension.
William Robb
>
>
>
>
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