Concerned about 720nm infrared filter (dHD)

[Northgrove]

I'm growing concerned my 720nm IR filter from dHD is a scam and in fact just a red filter?! Or am I just bad at post-processing...?

First, I can shoot with this filter handheld at ISO 800 in daylight, it gives me around a 1/40 sec shutter speed. This alone had me a bit surprised.

Second, the photos straight out of my Fujifilm X-T1 looks like this.



Then I can adjust color temperature to this:
(by using a custom profile to extend range in Lightroom)



And finally color swap R & B channels, but it barely makes a difference.



Everything comes out looking like this, with a purple sky if white balance is set by foilage.

It's nowhere near the output I see elsewhere online, with e.g. blue skies after a color channel swap? I also don't see much of color separation to speak of. But I'm new at this so I'm not sure if I'm doing anything wrong?

 

[FRGorga]

Your photos do not look like the result of using a true IR filter to me.

In bright sunlight, the foliage/grass will be bright white in an IR. The exposure time you cite is way too quick, even for a fast lens wide open.

What does the filter look like physically? The filter should appear essentially black.

You cannot compose or focus with a true IR filter mounted on the lens.

You would need to compose and focus, turn off the AF, mount the filter on the lens and then adjust your exposure.

If you hold a true R720 filter up to the sun you might be able to just see a trace to light coming through. They are that dense.

I don't do much IR work and that which I do is generally in black and white but here are some of my IR images from about a year ago: http://gorga.org/blog/?s=infra

Regards,

--- Frank (www.gorga.org/blog)

I'm growing concerned my 720nm IR filter from dHD is a scam and in fact just a red filter?! Or am I just bad at post-processing...?

First, I can shoot with this filter handheld at ISO 800 in daylight, it gives me around a 1/40 sec shutter speed. This alone had me a bit surprised.

Second, the photos straight out of my Fujifilm X-T1 looks like this.



Then I can adjust color temperature to this:
(by using a custom profile to extend range in Lightroom)



And finally color swap R & B channels, but it barely makes a difference.



Everything comes out looking like this, with a purple sky if white balance is set by foilage.

It's nowhere near the output I see elsewhere online, with e.g. blue skies after a color channel swap? I also don't see much of color separation to speak of. But I'm new at this so I'm not sure if I'm doing anything wrong?

--
--- Frank (http://www.gorga.org/blog)

 

[Northgrove]

Your photos do not look like the result of using a true IR filter to me.

In bright sunlight, the foliage/grass will be bright white in an IR. The exposure time you cite is way too quick, even for a fast lens wide open.

What does the filter look like physically? The filter should appear essentially black.

You cannot compose or focus with a true IR filter mounted on the lens.

You would need to compose and focus, turn off the AF, mount the filter on the lens and then adjust your exposure.

If you hold a true R720 filter up to the sun you might be able to just see a trace to light coming through. They are that dense.

I don't do much IR work and that which I do is generally in black and white but here are some of my IR images from about a year ago: http://gorga.org/blog/?s=infra

Regards,

Thank you for your reply. When I hold it up against a window, I can see through the filter just a little bit in dark red. A sticker on the box does say "52mm IR720 Infrarot HD Digital Passfilter" but I agree with you and think this isn't right and a fake. With the unprocessed photos, I can even see the foilage as near black but somewhat dark green, as if it's just generally making everything dark red and not actually dealing with letting IR reflections through.