Filter factor for Hitech red and orange filters

[shannaford]

Hi all,
Just hoping someone can provide some advice on how many stops of compensation you give to the Hitech 25a red or orange filters? They didn't come with any advice and can't find anything on their homepage, so grateful for your advice.
Thanks,
Scott

[Erik Larsen]

Hi Scott, I use 2 stops for the red, I don't have an orange if this helps at all.
erik

[shannaford]

Thanks Erik, much apreciated, I'll give that a try.

[venchka]

Hold the filter over your meter. Read the difference.

[gevalia]

Scott,

I found these somewhere a while ago on the HiTech website. I believe they are correct :

All hitech:
- red 2 1/3 stops #25
- orange 1 2/3 stops #21
- yellow 1 stop #8

- yellow/green 2 stops #11
- green 2 2/3 stops #58
- blue 2 2/3 #47


Ron

[mandoman7]

Hold the filter over your meter. Read the difference.

...and then add a stop, according to Hutchings.

JY

[venchka]

...and then add a stop, according to Hutchings.

JY

...or not according to Wayne.

[Sevo]

Scott,

I found these somewhere a while ago on the HiTech website. I believe they are correct :

They certainly are correct, but so is 42. The harder part is finding the matching question to the answer. Working out the filter factor for a given film and lighting is much easier and cheaper than figuring out the right film and lighting for a given filter factor. A red #25 should be reasonably similar in response no matter what maker it is from, and I've had to use anything from 1 to 8 stops with a #25, depending on film and light.

Sevo

[Chauncey Walden]

What Hutchings arrived at was based on getting enough detail in shadow areas. So, it was meter through the filter then add none, one, or two stops depending on the filter. In this case, orange (#21) plus 1 stop, red (#25) plus 2 stops.

[mandoman7]

...or not according to Wayne.

Shadow detail is not important in Texas?

John