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Re: [OM] Ways to go macro

Subject: Re: [OM] Ways to go macro
From: "Ian A. Nichols" <I.A.Nichols@xxxxxxxxxxxxx>
Date: Thu, 19 Apr 2001 14:46:15 +0100 (BST)
Earlier today, I wrote:

> Reversing ring is cheapest, but:
[snip]
>        disables TTL metering (except for OTF auto)

This needs a bit more clarification, I suspect.

A good reversing ring will have a metal tab that moves the aperture
coupling ring in the camera body to the position it would occupy with a
lens fitted.  I this case, the TTL metering system will indicate
exposure for the lens as-it-is.  So you have to have the d-o-f preview
fully depressed to take your meter readings as well as for the exposure
itself (or calculate from the full-aperture reading).

I believe (ie I could be wrong) there are some reversing rings out there
which don't have the metal tab referred to above - these will no allow a
TTL metering system to give a meaningful reading. 

-- 
________________________________________________________________________
*             |                                                        |
|  /  | |/-\  |                      Ian A. Nichols                    |
| |   | |   | |             http://www.chm.bris.ac.uk/~cpian/          |
|  \-/| |  /  |                  i.a.nichols@xxxxxxxxxx                |
|             *                    iann@xxxxxxxxxxxxx                  |
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