[MF3D.FORUM:641] Re: High speed film in viewer?

["Stuart Johnson - GCSPHOTO" <GCSPHOTO@xxxxxxxxxxxxx>]

Bill wrote:

  .
> Stuart
>
>      Good suggestion.  Have you, or anyone else, tried shooting any higher
> speed film (200 /400) ?  Has anyone tried to push 100 speed film one stop
or
> two?  I am curious how these films would look in the viewer.  I would
> suspect that grain would be visible and the image less desireable?  Any
> input would be helpful...
>
> Bill G

    Bill,  I would suggest trying some of the higher speed rated films. I am
new to the 120 film world
but have used 200 and 400 in the 35mm world.  You CAN get some great results
with the 200
speed films.  I think the 160 ASA ratings are pretty reasonable in the 120
format.  You should
   be able to shoot 100 ASA at F16 at 1/125 on a bright beach day. So, using
the basic law
    of 'halves' you should be able to get F8 at 1/250 or F5.6 at 1/500 using
100 ASA.  This
    is with just a skylight filter.  When you put filters on, you have to
diminish by whatever 'stops' the
filter tells you it needs.  For example, if you use a Polarizer with say a "
2 Stop" exposure increase,
then your base on a bright sunny day for 100ASA film would be: F5.6 at
1/125.  Use a 200ASA
film and it's F5.6 at 1/250.  THIS should be fast enough to freeze for a
nice effect.  Any basic
photography book goes through all of this.  I have seen slower films
'pushed' to higher ratings with good results.  They do this to take
advantage of the better clarity of the slower films (less graininess).
Why not try it?  I'd be curious to hear your analysis.

    All the best.  -Stuart