Efke IR 8x10 & Two Filters

Andrew O'Neill · Oct 23, 2022

I'm out with the 8x10, late this past August, with working Efke IR, a 720, and a Wratten 87C. Which filter gives me the best result? A couple of prints were made, too...

Michael W · Nov 2, 2022

Very interesting, thanks for taking the effort to video this process.

xkaes · Nov 2, 2022

Some people who want to check out IR don't want to go to the expense of an IR filter -- of whatever type -- because they made decide that IR is not for them.

But many of them can check out IR for just the cost of the IR film -- depending on what filters they already have.

Some try a strong RED filter like a 25A. That helps by cutting out the green and blue spectrums, but the IR effect is not very strong.

But, by simply adding strong GREEN filter like an X1 -- which cuts out the red spectrum -- in addition to the RED filter, the IR result is much stronger. And it might cost nothing at all -- except for the film.

Of course the results depend on the specific red and green filters you use as well as the IR film you use -- so results will vary.

And remember to adjust your focusing AFTER you attach the filters.

Andrew O'Neill · Nov 2, 2022

xkaes said:
Some people who want to check out IR don't want to go to the expense of an IR filter -- of whatever type -- because they made decide that IR is not for them.

But many of them can check out IR for just the cost of the IR film -- depending on what filters they already have.

Some try a strong RED filter like a 25A. That helps by cutting out the green and blue spectrums, but the IR effect is not very strong.

But, by simply adding strong GREEN filter like an X1 -- which cuts out the red spectrum -- in addition to the RED filter, the IR result is much stronger. And it might cost nothing at all -- except for the film.

Of course the results depend on the specific red and green filters you use as well as the IR film you use -- so results will vary.

And remember to adjust your focusing AFTER you attach the filters.

I could see the use of a green filter in combination with a #25 red could improve the Wood effect, but after you apply the factors for both filters, it's pretty muchthe same as just using a 720 filter alone. At any rate, the effect would be different, I am sure. Something that I must try now! Thanks!

xkaes · Nov 2, 2022

Andrew O'Neill said:
..., it's pretty muchthe same as just using a 720 filter alone.

Except for the cost. Many photographers already have a pretty good IR filter, but don't know it. And if you don't already have a red and a green filter, they are a lot cheaper than a 720 -- and useful in other ways on their own.

Andrew O'Neill · Nov 2, 2022

Zomei 720 IR filters are cheap, and work really well. I have an Urth 720. It's probably the most expensive filter I own. I compared it with the Zomei recently. It'll end up in a video in the very near future.

Efke IR 8x10 & Two Filters

Andrew O'Neill

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Michael W

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Efke IR 8x10 & Two Filters

Andrew O'Neill

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Michael W

xkaes

Andrew O'Neill

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