Custom Center Filters Printed On Clear Gelatin

Mustafa Umut Sarac · Oct 14, 2014

Inkjet dots will work as nonlinear filter if your inkjetted area transmits light. I dont have any idea about center filters but inkjet will create semispherical dots and god knows how they will be shaped in result of diffusion in gelatin. Nonlinear filters have same but three dimensional dots in the mass. I thinked the same idea for to make my autochrome RRGGBB filter and Photo Engineer reported that he hadnt eeen an successful filter out of printer. But if your inkjetted area will not transmit light , I cant see a problem.

AgX · Oct 15, 2014

A alternativ to a printed or optical filter could be the Hypergon approach:

a serrated homogeneously opaque aperture that is twisted during exposure.
Depending on construction it necessítates a double exposure.

DREW WILEY · Oct 17, 2014

As far as that inkjet option goes ... take a can of black spray paint and partially mist it over your eyeglasses and try to see anything clearly. What's the difference? Might was well be smashed bugs all over a windshield.

OldBikerPete · Oct 18, 2014

DREW WILEY said:
As far as that inkjet option goes ... take a can of black spray paint and partially mist it over your eyeglasses and try to see anything clearly. What's the difference? Might was well be smashed bugs all over a windshield.

The difference is black, spotty mist on your eyeglasses is way out of focus and has a similar effect to a homogenous smoked glass filter (smoked glass BTW is ash particles on glass) bugs on a windscreen are usually in focus and can be individually seen.

AllanD · Oct 18, 2014

On a slightly different tack, would using liquid B/W emulsion (e.g. Liquid Light) work? Is it clear after processing? Would it be possible to coat a clear round filter with liquid emulsion (perhaps spinning it somehow to level out the coating) in such a way as to make it optically acceptable? If so, the emulsion could be exposed via the lens to which the filter would be attached, giving a perfect match. Just thinking out loud, so sorry if the idea is bollocks!

OldBikerPete · Oct 19, 2014

AllanD said:
On a slightly different tack, would using liquid B/W emulsion (e.g. Liquid Light) work? Is it clear after processing? Would it be possible to coat a clear round filter with liquid emulsion (perhaps spinning it somehow to level out the coating) in such a way as to make it optically acceptable? If so, the emulsion could be exposed via the lens to which the filter would be attached, giving a perfect match. Just thinking out loud, so sorry if the idea is bollocks!

You could make an exactly compensating filter from photographic film IF you are going to use the resulting filter at the film plane and IF you can get an exactly uniform subject to use for the exposure which creates your filter in the first place. I understand that the second condition is not so easy to achieve. Of course you would have to experiment to achieve the correct density in the filter.

rdg · Oct 19, 2014

OldBikerPete said:
You could make an exactly compensating filter from photographic film IF you are going to use the resulting filter at the film plane and IF you can get an exactly uniform subject to use for the exposure which creates your filter in the first place. I understand that the second condition is not so easy to achieve. Of course you would have to experiment to achieve the correct density in the filter.

That assumes, of course, that there is never going to be any camera movements when using said filter. The advantage of having the filter on the lens is that, especially with large format systems, the exposure compensation is constant for that lens regardless of where the image circle falls on the film.

Richard

OldBikerPete · Oct 20, 2014

rdg said:
That assumes, of course, that there is never going to be any camera movements when using said filter. The advantage of having the filter on the lens is that, especially with large format systems, the exposure compensation is constant for that lens regardless of where the image circle falls on the film.

Richard

Correct.

Custom Center Filters Printed On Clear Gelatin

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