Do Panoraflex lenses need a center filter?

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?

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

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

http://www.panoraflex.de/index.php

RolandRB <rolandberry.DeleteThis@hotmail.com> 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


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