[LargeFormat] Wide angle for XLF

[Jim Hemenway]

Hi Michael:

Thanks, very much, for the in-depth reply. I'm waiting to see my next
commission check to determine if I'll have enough money.  The SA is
running about $1,200 used.

Thanks also for steering me away from considering an Angulon.

Jim - http://www.hemenway.com



Michael Briggs wrote:
> 
> The designs of the Grandagons and Super-Angulons (and also Nikkor-SWs and
> Fuji-SW and -SWD) are quite similar.    These lenses are all designed to have
> better light falloff than a standard lens design.   If with focal length X of
> Brand Q of a lens listed above on format size Y with film Z, you find that you
> need a center filter, then switching to Brand P from the list above is very
> unlikely to change your need for a center filter.  These lenses are not
> designed to need or not need a center filter: whether a photographer will want
> a center filter depends on the format they are using the lens for, the type of
> film, subject matter and their taste.
> 
> The super-wide lenses listed above have their characteristic appearance of very
> wide outer elements (both front and back) compared to the width of the middle
> elements because they are using a trick of tilting the enterance and exit
> pupils.   You can see the effecting by looking at the front of one of these
> lenses with the aperture stopped down about half way, and slowly turning the
> lens from viewing it straight on to viewing it an angle.  The outside rim
> of the lens will quickly become elliptical, but the aperture will remain closer
> to a circle.   This effect theoretically reduces the light falloff to the third
> power of cos theta, instead of the standard fourth.   In practice (based upon
> the curves published by Rodenstock and Schneider), the improvement is not quite
> as good.
> 
> The lenses mentioned in the first sentence have the improved falloff.  The old,
> plain Angulons do not.  Nor the the new, high-technology Super-Symmar-XLs.
> In some cases, like yours of a 200 mm lens for 11x14, this is a reason to
> select the Super-Angulon or Grandagon over the smaller Super-Symmar-XL.
> 
> --Michael
> 
> On 03-Mar-2003 Jim Hemenway wrote:
> >
> > Having determined through some lens testing with paper negatives, that
> > my Rodenstock 300mm and 210mm process lenses are not suitable for wide
> > angle use on my 11x14, I'm now looking into the acquisition of a
> > Schneider Super Angulon 210mm f:8.
> >
> > Do any of you know whether or not this lens needs a center filter, i.e.,
> > was it designed to require one.
> >
> > It appears that the Rodenstock 200mm Grandagon does require one and
> > costs almost as much as the lens does - used.
> 
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