Using Tech Pan with filters

[josh_randall2]

Just curious if anyone has used tech pan film with filters. I know it has an increased sensativity to red light. Thus, what effect does a #25 red filter, or a K2 yellow filter have on the image? Thanks in advance for your responses.

[james___]

It's pretty contrasty already so be sure you have a really good reason

for using filters with it.

[pat_j._krentz_29_palms__ca]

Also remember that a filter blocks its own color. Pat

[henry_friedman]

Regarding the last post...

I believe that a filter transmits its own color, and blocks those

opposite on the color wheel. Therefore a red filter would have the

effect of increasing the apparent red sensitivity.

[pat_j._krentz_29_palms__ca]

If you photograph a red barn and allow for the filter factor, you wind

up with a white barn basically, if you do not allow a filter factor

you will have the tonal value of a red barn, try it. Pat

[thomas_wollstein]

Pat

 

<p>

 

That is not a contradiction to what Henry said. In the shot with the

exposure without filter factor allowance, the filter might leave the

red areas basically unchanged, while darkening (in the print) all

other areas. If the statement in your previous post were true ("Also

remember that a filter blocks its own color. Pat") the red barn would

be black (or transparent in the negative) in a photo not taking into

account the filter factor.

[pat_j._krentz_29_palms__ca]

Tom, you are right about filter factors, where I went astray was I

don't use them, so that when I photograph a red rose I do not allow

for a filter factor and my roses come out very dark which in the gray

scale approximates what I would call dark red, in the negative it is

very light exposure which prints very dark. Sorry about the confusion

on my part. Pat