[Leica] Re: Odd diffraction patterns

[lrzeitlin at optonline.net (Lawrence Zeitlin)]

On Apr 20, 2007, at 8:27 PM, lug-request@leica-users.org wrote:

> I took two more dew pictures this morning.  One at f/3.5 (my  
> preferred),
> and one at maybe f/8(?).  The stopped down photo has out of focus
> highlights unlike any I've ever seen without anything in front of  
> the lens,
> and I've fooled around with diffusion a lot.  I've included a  
> magnified
> version of these spots.
>
> Smooth background:
> <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Color/ 
> DropWideStop.jpg.htm
> l>
>
> Stopped down:
> <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Color/ 
> DropSmallStop.jpg.ht
> ml>
>
> Magnified:
> <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Color/ 
> SmallStopUFOs.jpg.ht
> ml>


Alan,

How many blades does your lens diaphragm have? If it has 6 blades,  
that might be the cause. I had much the same effect in photos shot  
into the light.

Larry Z