John Gardner wrote:
>
> Bob asked; Gary answered - I replied thus:
>
> A really good use for the 7mm tube is to leave it permanently attached to
> the 180mm f/2.8 which does not focus close enough for me. This turns it
> into a proper portrait lens and a useful nature photographer's lens. 7mm is
> also useful for adding to other combinations of tube too.
>
> As an aside, I recently used the 7mm tube on a 24mm wide angle to
> photograph a Burnet Moth on a pyramidal orchid. The tube allowed me to get
> close enought to get the moth big enough in the frame while retaining a big
> vista behind.
>
> John.
>
> ----------
> > From: PCACala@xxxxxxx
> > To: olympus@xxxxxxxxxxxxxxx
> > Subject: Re: [OM] 7mm Macro Extension Tube
> > Date: 27 August 1998 9:16 am
> >
> > Hi Bob:
> >
> > > When would something like this be useful? How much effect will it have
> > > and which lenses would be best suited to its use?
> >
> > The shorter the focal length, the more effective this is in being able to
> > focus closer. For example:
> >
> > 35 mm f/2.0 Zuiko
> > 1:5.3 reproduction ratio normally
> > 1:4.3 w/ 7 mm tube
> >
> > 28 mm f/2.8 Zuiko
> > 1:6.3 normally
> > 1:2.3 w/ 7 mm tube
> >
> > 24 mm f/2.8 Zuiko
> > 1:6 normally
> > 1:2 w/ 7 mm tube
> >
> > But frankly, I can't remember having the desire to focus my wide angles
> closer
> > than normal, so mine is still looking for a reason for its existance.
> Given
> > that it weighs close to that of the 25 mm tube, I'll opt to carry the
> latter,
> > which gets the 50 mm Macros to 1:1 (in a pinch) and offers a bit closer
> > focusing with telephoto lenses.
> >
> > Gary Reese
> > Las Vegas, NV
> >
Hi Gary & John,
Thanks for the useful input.
Regards,
-Bob-
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