I don't get it either! You'll have noticed that I didn't sepcify the
aperture on the CCTV lens - unmarked, and I wouldn't know the relevance
either. All this shows is that it is worth experimenting.
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Chuck Norcutt
Sent: 22 September 2005 23:27
To: olympus@xxxxxxxxxx
Subject: [OM] Re: OM macro lenses?
The DOF of the shorter lens pair makes a superior result but I still don't
understand it. After looking at the amount of extension I'd have said the
effective focal ratio of the short pair was much higher than the
50+extension but the exposure time is the same. I don't get it.
Chuck Norcutt
Piers Hemy wrote:
--snip
>
> www.hemy.me.uk/Miscellany/50+25tube.jpg was taken with a Zuiko 50/3.5
> with 25mm extension tube at 1:1, lens at f/22.
>
> www.hemy.me.uk/Miscellany/Tandem20+4.jpg was taken with a Zuiko 20/3.5
> with 150mm of bellows extension, lens at f/3.5, coupled to a 4mm CCTV
> lens which was mounted to the Zuiko using a custom engineered adaptor.
--snip
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|