Re: Do Panoraflex lenses need a center filter?

RolandRB <rolandberry@[EMAIL PROTECTED]
> wrote:

> Do the wider-angle lenses that can go with the Panoraflex camera, such
> as the 75mm and 90mm lenses, need a center filter to reduce vignetting
> or do modern lenses not need it?

Panoraflex... aha. Bought one of those from this chap when they still
carried the original Gaoersi label. 

I use it with a Nikkor 8/90 mm for 6x17 cm and this works fine without a
center filter if the lens is stopped down to f22 at least. The same
should hold true with the 75 mm lens and 6 x 12 cm (75 mm with 6 x 17 is
too extreme in my opinion). 

Use a center filter and you may open up the lens by a stop or two and at
the same time you'll have to multiply your exposure time by the filter
factor, so you'll end up with the same times as without.

> Is the 2cm shift enough for architectural work when using the 75mm and
> 90mm lenses?

There's no easy answer to that question. Depends on what you want to
photograph from what distance. 

> Not sure if this should go in the large format category. Can 120 or
> 220 film use be "large format"?

Most large format forums accept people doing 6 x 17 on rollfilm in their
discussions so I guess it would qualify as LF. You could always say
you're doing 2 by 7 inch format. :-)

Ralf 


-- 
Ralf R. Radermacher  -  DL9KCG  -  Köln/Cologne, Germany
private homepage: http://www.fotoralf.de
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