How to Meter Ortho 25 Film

[wideopeniris]

<p>I have a box of Adox Ortho 25 ASA sheet film for 4x5in. I am wondering how to meter it.<br>

Does the rating of 25ASA account for the fact that the meter is white light sensitive, but the film is blue sensitive only? In other words, do I need to put a cyan filter (an 80c is the closest I have) on the meter to get it to meter correctly (with it set to 25ASA) or do I meter with no filter (perhaps making adjustments for strongly coloured scenes) and set to 25ASA ??<br>

many thanks for any advice,<br>

Kevin.</p>

[larrydressler]

<p>This may help.</p>

<p>http://www.mahn.net/TAOrte.htm</p>

[wideopeniris]

<p>So if I read that right - I need to set ISO 25 on my (pan sensitive) meter and meter as normal without a filter, and yes maybe it should be iso 50, who knows... have I got that right?</p>

<p>Thanks,</p>

<p>Kevin.</p>

[larrydressler]

<p>That is the way I read it.</p>