Archived posting to the Leica Users Group, 2002/07/18

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Subject: Re: [Leica] When f 1 is too mush!
From: "Rei Shinozuka" <shino@panix.com>
Date: Thu, 18 Jul 2002 23:10:44 -0400 (EDT)

after all that,  aren't you going to post examples ?!?

perhaps you are talking about the "nauselux" syndrome,
where you are focusing at 6 ft, and objects about 12 ft 
and in the center 3/4" of the frame take on a swirling,
motion-filled appearance.

i personally find the phenomenon fascinating, but others 
on this list are less enthusiastic.

- -rei


> From: Ted Grant <tedgrant@shaw.ca>
> 
> "When f 1.0 is too much out of focus!"
> 
> Hi Gang,
> An interesting observation when using the Noctilus at f 1.0 creating a "too
> much out of focus look" that actually becomes a distraction compared to the
> same situation at  f 2.0!  Same lens but stopped down to f 2.0.
> 
> As many of you are aware I'm Bigtime into using M7 and the Noctilux on my
> new medical project, women in medicine. Today when editing negatives shot at
> f 1.0 during an eye examination at an Ophthalmologist's office I found
> something I'd not experienced before.
> 
> A couple of shots were very interesting, but the depth of field at f 1.0
> created a weird look, a visual distortion of out of focus that was
> distracting, compared to a few frames of the same scene but shot at f2.0 .
> Where there was just enough sharpness, read "less out of focus" to carry the
> background to an acceptable sharpness of recognition content.
> 
> It's something I've not encountered in my many years of using a Noctilux and
> I'm sure it's merely the clothing and angle of focus that added to this
> strange out of focus look. I just thought you might find it interesting that
> sometimes weird visual phenomena can occur when using some lenses under
> certain angles and wide open  apertures.
> 
> ted


- -- 
Rei Shinozuka shino@panix.com
Ridgewood, New Jersey

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Replies: Reply from Ted Grant <tedgrant@shaw.ca> (Re: [Leica] When f 1 is too mush!)