infra red filters

[L4MBOLUV3R]

hi i just got a infra red filter IR 720nm 58mm and ive seen things like these pictures http://www.pbase.com/allonkira/infrared and it interested me. i know what IR is and how it differs from visible light but it arrived today and i cant seem to get any thing close to the pictures on that site? i don't know if im doing it wrong or what?



just put on auto and took a snap

[fastfreddy]

What were you hoping a snap of a lampshade would look like?

[baz7175]

Going by his site, he pretty much explains how to produce the sort of images he has on his website:-

[quote]
My IR filter is the Hoya R72. this filter blocks about 95% of the visible light under 720 nm. This is why it's not a "real" IR filter but "near IR" filter and lets you get colorful IR images.

The most important thing in IR photography is to set the WB (with the filter on!) before shooting -to get these surreal colors.

After taking the shot, a little postprocessing: levels (usually auto), contrast (about +5%-10%), saturation (about + 10%), RED and BLUE channels swap and sharpening.

RED and BLUE channels swap: go to IMAGE > ADJUSTMENTS > CHANNEL MIXER. now, choose output channel:RED. in the source channel set the RED to 0% and the BLUE to 100%. don't close the box. now choose output channel:BLUE. in the source channel set the RED to 100% and the BLUE to 0%.
[/quote]

[baz7175]

And another thing - note that the images that show up on the page you linked to are all HDR images - so he does all of the above, then either tone maps a single image or creates a true HDR from several different exposures etc

[L4MBOLUV3R]

fastfreddy said:

What were you hoping a snap of a lampshade would look like?

the picture is to show how i can only get light from the source itself. it wont pick it up from anywhere else like a flower or on the wall

[baz7175]

L4MBOLUV3R said:

fastfreddy said:

What were you hoping a snap of a lampshade would look like?

the picture is to show how i can only get light from the source itself. it wont pick it up from anywhere else like a flower or on the wall

Did you remember and set the white balance with the IR filter on? Otherwise you're pretty much going to block out all light other than the sun (and other bright objects)

[L4MBOLUV3R]

i know thats all photo shopped to produce that but i thought i would atleast get images like these

[L4MBOLUV3R]

baz7175 said:

L4MBOLUV3R said:

fastfreddy said:

What were you hoping a snap of a lampshade would look like?

the picture is to show how i can only get light from the source itself. it wont pick it up from anywhere else like a flower or on the wall

Did you remember and set the white balance with the IR filter on? Otherwise you're pretty much going to block out all light other than the sun (and other bright objects)

i put the lense on first then turned the camera on. i didnt set the balance but since its auto imagine it would of done it itself

[baz7175]

Yeah fair do's, it's also possible to do the same effect via Photoshop with a normal image - here's the basic jist of how it's done:-

http://www.renderosity.com/news.php?viewStory=1359...

...after which overlaying the image with the original to pull out a little colour, or being selective and colouring certain areas

[L4MBOLUV3R]

baz7175 said:

Yeah fair do's, it's also possible to do the same effect via Photoshop with a normal image - here's the basic jist of how it's done:-

http://www.renderosity.com/news.php?viewStory=1359...

...after which overlaying the image with the original to pull out a little colour, or being selective and colouring certain areas

cheers. i would like to know how todo it with my lens specially since i just paid out for it lol

[Simpo Two]

I've never tried IR photography but some digital cameras are more succesful than others due to a built-in filter (anti-alias?) over the chip. This filters out IR light so as you can imagine it rather buggers up the results.

Nikon D70s are popular for IR work as the filter isn't that powerful - and if you're brave you can even remove it: http://www.lifepixel.com/ir-tutorials/nikon-d70-di...

http://www.naturfotograf.com/D70_rev05IR.html

[L4MBOLUV3R]

Simpo Two said:

I've never tried IR photography but some digital cameras are more succesful than others due to a built-in filter (anti-alias?) over the chip. This filters out IR light so as you can imagine it rather buggers up the results.

Nikon D70s are popular for IR work as the filter isn't that powerful - and if you're brave you can even remove it: http://www.lifepixel.com/ir-tutorials/nikon-d70-di...

http://www.naturfotograf.com/D70_rev05IR.html

unfortunately i own a fuji s9600 so i dont have the luxury of removing my lens lol. just so annoying. ive had little plays with it but i cant seem to get anything. the only way as ive said is to place it straight on to a light source

[fastfreddy]

First of all, check your camera is sensitive to IR by pointing it at an IR remote control or something with a IR LED. These come in different wavelengths, but it will at least give you an idea of whether an internal filter or the sensor is the problem.

If that works, I'd follow the guidelines on that site and see if you can get something close to their results.

[Simpo Two]

L4MBOLUV3R said:

unfortunately i own a fuji s9600 so i dont have the luxury of removing my lens lol. just so annoying. ive had little plays with it but i cant seem to get anything. the only way as ive said is to place it straight on to a light source

Well if there's a filter in there removing the IR light then you're a bit buggered. However if you want to do this half seriously, you could pick up a s/h D70 for maybe £150 and experiment? There may be other cameras suited to IR, I don't know.

[L4MBOLUV3R]

fastfreddy said:

First of all, check your camera is sensitive to IR by pointing it at an IR remote control or something with a IR LED. These come in different wavelengths, but it will at least give you an idea of whether an internal filter or the sensor is the problem.

If that works, I'd follow the guidelines on that site and see if you can get something close to their results.

it picks up IR fine

i left colour on black but it works in both

so i dunno, will just have to have a play.

[fastfreddy]

Most IR LEDs are above 800nm so that's a good start. Try putting your IR filter on the lens and see if you can still see the LED as brightly.

[_dobbo_]

You don't mention how long an exposure you are using - but if you are shooting hand held then I'm not surprised that you aren't seeing much.

Try putting the camera on a tripod with the IR filter on and then doing a much longer exposure, you should find you see much more in the resulting photograph!

[L4MBOLUV3R]

thanks, that did the job lol



f-number : 3.7
exposure : 30secs
ISO : 200

light source : ambient/spot florescent light from above

[VxDuncan]

L4MBOLUV3R said:

thanks, that did the job lol



f-number : 3.7
exposure : 30secs
ISO : 200

light source : ambient/spot florescent light from above

Yeah, your Camera won't be very sensitive to IR light. You're gunna need long exposures... Typically a DSLR will let through about a 30th of the available IR light due to the AA filter on the lens. Whilst on a DLSR it is possible to replace the AA filter with cut glass you use AF. Trouble is you are stuck with however your cam is configured. Also worth noting your coin won't be emitting much IR.

[Cabinet Enforcer]

Simpo Two said:

L4MBOLUV3R said:

unfortunately i own a fuji s9600 so i dont have the luxury of removing my lens lol. just so annoying. ive had little plays with it but i cant seem to get anything. the only way as ive said is to place it straight on to a light source

Well if there's a filter in there removing the IR light then you're a bit buggered. However if you want to do this half seriously, you could pick up a s/h D70 for maybe £150 and experiment? There may be other cameras suited to IR, I don't know.

The 9600 does have an IR filter, it is possible to dismantle the cam and remove it, but I can't find a howto on the web and the website which used to offer conversions has vanished. The advantage with the 9600 being a fixed lens is that you can mount a suitable filter on the front of the lens to convert it back to normal. Fuji used to sell the IR dedicated IS-1 which was just a 9600 with no IR filter.

You can get away with AF still working OK as the smallish sensor means a bigger DOF, which tends to hide the slight shift in focus, plus the 9600 has decent manual focus if needed.

The only workaround is long exposures, and they still won't look as good.