Colour correction filters, but for mono

[seany65]

I was wondering if filters that are meant to correct colour-balance for colour film can affect mono film?

eg. A Blue filter for mono film has a fairly strong effect on mono film, would a light blue 82A filter have a lesser effect or no effect?

Wold a warm-up filter have an effect tghat is between yellow an dorange or no effect?

Any help would be much appreciated, even if not understood, lol.

 

[Chriscrawfordphoto]

Most of them would have little or no effect. Colored filters used for B&W film are very strongly colored filters - green, orange, red, blue, yellow. They're not for altering color temperature but for radically changing the grayscale values of different colors in the scene.

 

[seany65]

Thansk for the info, Chris.

I didn't think the warm-ups would have much effect, but did think some of the stronger blue cooling filters may.

 

[Rob-F]

I don't think there would be much point in using a blue filter for black and white, anyway. Most of the time we want to filter out the blue wavelengths, not filter them in, for purposes such as darkening the sky and improving cloud contrast; or reducing haze caused by ultraviolet light. But I have heard of using blue filters for the purpose of copying old, yellowed documents.

 

[seany65]

I'd been wondering about using a light blue filter to increase the effect of haze or fog a little, without darkening most of the colours too much which would happen with a "proper" blue filter.

 

[BillBingham2]

Think of them being Grey-Scale-Shift rather than colour correction. I hope that the easy photo editing vendors will come out with options for changing color jpeg to B&W.

B2 (;->

 

[DownUnder]

A photographer I know uses a blue filter (probably a B&W one as I believe it dates to the 1950s) to create an 'orthochromatic' effect on modern films.

Why anyone would want the ortho look in this day and age is beyond me to know, but there you are. I could ask him, I suppose. I may, if I remember to.

Anyway, one more use for a blue filter.

 

[raydm6]

Anyone use a polarizer/polarizing filter while shooting B&W?

 

[Rob-F]

I hope that the easy photo editing vendors will come out with options for changing color jpeg to B&W.

B2 (;->

Are you not satisfied with ones that presently exist? I use either of two ways, with Aperture: First, Aperture has a black and white conversion option, color to black and white. Second, I can desaturate using the saturation slider, and then, to achieve the effect of filters, I can use the color sliders. So if I want the effect of using a yellow filter, I can pull back on the blue slider, since blue is the complement of yellow. A slight reduction for a K1 filter; more for a K2 cloud filter; still more for a K3, a wratten #15, or orange filter. For a green filter, pull back blue and red a bit. And so on, reducing the color complements of the filter you want to mimic. Oh, and for a blue filter, pull back red and green. Determine the amount of reduction by trial and error.

 

[seany65]

@B2, do you mean like making the entire scale lighter or darker, instead of making some shades being made lighter or darker?

ozmoose, Ilford do make an Ortho 80 asa film, so there is some call for the ortho look.