Canon EOS 5D and IR Photography

[tomcat]

Just tested the Canon EOS 5D today for it's IR capability using the EF 50mm f/1.8 lens and the Hoya R72 IR filter. Seems to me that the 5D is a lot more sensitive than the 20D to IR and is therefore very useable for IR photography.

Check out these test shots....

#1

1s, f/3.5, ISO 400

#2

2s, f/3.5, ISO 400

#3

1s, f/3.5, ISO 1600

#4

2s, f/3.5, ISO 400

[Pablo]

Hi tomcat,

Thank you for showing the 5D ability. It will be added.

In particular with pic #1 and #4, they look like they have a reverse hot spot

Cheers

[ark19]

Could be vignette?

[tomcat]

I think it's because of the dynamic range between brightly lit and shadowed areas...

#1 was taken from a shaded location and the subject (the building and some of the shrubs) in the centre of the frame was in direct sunlight while the bottom, side and top of the frame were in the shade. In any case, the sky if very clear, also tends to appear darker at the top of the frame even in direct sunlight and even in normal photography.

In #4, the flower head in the centre of the frame was in direct sunlight while the parts of the background were in the shadows cast by surrounding branches. I could not get any closer than this distance to exclude the shadowed and redundant areas as I was not using a macro lens for this shot.

[TrailsofLife]

I think its a vignette, 5D have a 20 or was it 30% light loss which is a known fact, like film slr. It can look quite nice on a normal image.

Can post a unprocessed image?

I didn't bother to try my 5Ds, as I expect canon to pump in a tougher hot mirror, but what a nice surprise!

[tomcat]

Originally Posted by Max 2.8 I think its a vignette, 5D have a 20 or was it 30% light loss which is a known fact, like film slr. It can look quite nice on a normal image. Can post a unprocessed image? I didn't bother to try my 5Ds, as I expect canon to pump in a tougher hot mirror, but what a nice surprise!

This is the unprocessed but scaled down jpg file that accompanied the RAW file of #1.


1s, f/3.5, ISO 400

Since you have a 5D, can I check something with you? Do you have any problem with exposure when using a bounce flash in any mode other than Prog? I'm testing out my friend's 5D and the shots are always underexposed if I bounced the flash in Aperture, Shutter or Manual modes. I don't have any such problem with all my other cameras and I think there must be something wrong with the exposure control of this particular 5D.

[TrailsofLife]

If you are judging from the screen, its normal. When you open in PS, it'll look fine.

Mine so far so good, but I shoot manual mode most of the time.

[deadpixel]

Originally Posted by Max 2.8 I think its a vignette, 5D have a 20 or was it 30% light loss which is a known fact, like film slr.

No, no, not vignette

It's called light falloff and is something that improves/disappears when you stop down the lens...the problem is that when you stop down the lens, you may bump into hot spots...

Cheers,
Matt

[TrailsofLife]

Originally Posted by deadpixel No, no, not vignette It's called light falloff and is something that improves/disappears when you stop down the lens...the problem is that when you stop down the lens, you may bump into hot spots... Cheers, Matt

yah correct, its light loss

Tomcat,

I downloaded your image and try out in PS. I realised if you just do a standard channel switch, maybe lower the yellow in hue/saturation. Its good enough, dun sharpen and increase cyan. Your 5D ir image can be quite natural.