On Wed, 31 Jul 2002 15:27:16 +0200, "Xm@n°" wrote:

>Few filter questions
>Yesterday I have purchased a filter Heliopan (Made by Schneider, B+W) type
>KR1.5 or the Skylight 1A (very similar to 81A by Toya or Tiffen). I buy it
>for a good price in excellent condition mainly for a protection purposes. It
>is very slightly colored, like salmon color.
>
>Important issue is that I DO NOT shoot slide films, but negatives and B&W
>films!
>
>Questions are: What effects will that filter have on my pictures?

None, given that you do not shoot slides, and
assuming the filter has no faults...

>Can I leave it constantly on the lens (50 mm 1.8N, 28mm 2.8 D or 35 - 70
>3.3 - 4 AF) all the time egz. outdoors, evening, morning, indoors, indoors
>with flash etc.?

Yes.

>How will it affect my B&W pictures?

Not at all...

>This are the links to the filter (KR1.5 <1A> ) :
>http://www.schneideroptics.com/filters/filters_for_still_photography/uv_&_wa
>rming
>http://www.heliopan.com/heliopan_c_c_filter.htm
>
>The other question is:
>
>Can a Circ. polarizer be used as a neutral density filter? It is color
>neutral and have a factor of 2 - 2.2 I think. So why not used it as a ND
>(with or without turning it for his original effect) in a case of high speed
>film in camera and bright light situation like taking longer exposures of
>waterfalls?

It reduces the shutter speed only by a stop to 1.5 stops
(not a lot), and the color and some local contrasts may
change, not always for the better...

>What is your recommendation for a B&W filter (yellow, orange, red, light
>red, green or yellow-green) in a case where it should take a picture:
>white stone house, with some (or no) green foliage, possible strong shade
>(from 10am - 19pm) and maybe some people dressed in black passing by (not a
>close portrait).

No colored filter will affect the results, with the
possible exception of lightening/darkening the green
slightly with a green/red filter (not worth bothering
with...). If the shadows show *strong* blue color
(unlikely), a red filter may darken them slightly.
Color filters work by having subject tones altered
according to their colors (mostly fairly pure ones)
relative to the filter color; no color, no tonal shift...

>There is also a possible "no clouds at all" situation here!
>Could be a high contrast shot, and I am considering a low speed (25 or 50
>ASA) film and tripod. Now I am wonder what filter would suit this situation
>best (I have only Medium Yellow K2 and CP)? Probably will buy one max two.
>Need advice and help.
>Any ideas?

If there is a bright clear sky, an orange or red filter
can be useful (at normal altitudes, with normal skies,
using a yellow is a waste of effort and shutter speed
or aperture...). A polarizer can be used to help darken
a sky if the angle of view is not wide, but it can ruin
small reflections, making things look dull...