7D IR Retry

Drudkh · 23rd April 2005

Today got to borrow and IR filter to run another test and failed badly. here are the results.

This shot was taken without covering the VF.

6 secs, f/5.6, ISO400

This shot was taken with VF covered using the provided VF cap + the hotshoe cover clip on the VF cover.

6 secs, f/6.7, ISO400

This shot was taken with VF covered using my thumb.

6 secs, f/6.7, ISO400

White Balance was set to auto, AS off, sharpness +1, saturation +1, honeycomb metering and all shots post-processed with Paintshop Pro 9, 1 step photo fix and resized. Photo was taken somewhere in the direction towards the east @ 9am.

Man, I just don't understand what is going on?

Please disregard the colour tone of the photos, I am addressing about the bluish-purple highlights and not the post-processing (I believe it doesn't matter much).

If you would like the original files to see and post-process them yourself to find out, kindly send me a PM and I'll give you the link to download.

* Sorry, I just updated the photos, previously were wrong ones & in wrong order but doesn't matter much anyway.

Del_CtrlnoAlt · 23rd April 2005

look like some old fotos...

btw y there is the L shape flare on the pic?

wat lens u use? also, i thought for IR, we use low iso, open aperture den set long exposure?

Drudkh · 23rd April 2005

it doesn't matter much at what ISO to use. if you follow my previous thread on my first IR test, you'll see the same thing.

now, i'm trying to find out why does this happen.

TME · 23rd April 2005

I've never done IR but is it possible to raise the ISO and hence the shutter speed so that the exposure time is shorter? Wonder if that will help... from the shape of the reflection and that they appear at the 4 corners, it looks like light bouncing off the mirror...

Drudkh · 23rd April 2005

Originally Posted by TME

I've never done IR but is it possible to raise the ISO and hence the shutter speed so that the exposure time is shorter? Wonder if that will help... from the shape of the reflection and that they appear at the 4 corners, it looks like light bouncing off the mirror...

exactly... but if i increase the ISO further, the amount of noise will be much more than you see from those i took today, esp the last one.

tokrot · 24th April 2005

Hi Drudkh.

please refer to my thread http://forums.clubsnap.org/showthread.php?t=125567

U need some post processing on your Pic... I searched in Dpreview threads and almost every shot with D7D taken look like yours including mine (reflection). So far, I have yet to see anyone successfully converted it to more colorful pic but I will try that again when I am free.

TME · 24th April 2005

But that reflection is not acceptable what.....

Drudkh · 24th April 2005

Originally Posted by tokrot

Hi Drudkh.

please refer to my thread http://forums.clubsnap.org/showthread.php?t=125567

U need some post processing on your Pic... I searched in Dpreview threads and almost every shot with D7D taken look like yours including mine (reflection). So far, I have yet to see anyone successfully converted it to more colorful pic but I will try that again when I am free.

Hi,

the purpose of my IR threads are to address the issue of the bluish-purple highlights in the photos and not about taking good IR or good post-processing on them.

on my very first try, i followed axactly how an IR photo should be post-processed but this bluish-purple thing pops out, therefore i used Paintshop Pro's 1-step photo-fix to bring it out more.

gooseberry · 24th April 2005

Hey mate,

Hmmm.. interesting. Do you get those same highlights with different lenses ? Looks like those four square highlights in the corners could be due to internal reflection from something - either the lens or double reflection off the sensor or filter pack to the lens and back.

Drudkh · 24th April 2005

Originally Posted by gooseberry

Hey mate,

Hmmm.. interesting. Do you get those same highlights with different lenses ? Looks like those four square highlights in the corners could be due to internal reflection from something - either the lens or double reflection off the sensor or filter pack to the lens and back.

I only have 2 lenses and was using my KM 28-75 2.8 and yes it is very interesting.

At the moment, I could only get to borrow my friend's IR ilfter, which is the hoya. I don't mind if I can get hold of other types of IR filters to try out.

23rd April 2005	#1
Drudkh Senior Member Join Date: Mar 2004 Location: lulu island Posts: 6,053	7D IR Retry Today got to borrow and IR filter to run another test and failed badly. here are the results. This shot was taken without covering the VF. 6 secs, f/5.6, ISO400 This shot was taken with VF covered using the provided VF cap + the hotshoe cover clip on the VF cover. 6 secs, f/6.7, ISO400 This shot was taken with VF covered using my thumb. 6 secs, f/6.7, ISO400 White Balance was set to auto, AS off, sharpness +1, saturation +1, honeycomb metering and all shots post-processed with Paintshop Pro 9, 1 step photo fix and resized. Photo was taken somewhere in the direction towards the east @ 9am. Man, I just don't understand what is going on? Please disregard the colour tone of the photos, I am addressing about the bluish-purple highlights and not the post-processing (I believe it doesn't matter much). If you would like the original files to see and post-process them yourself to find out, kindly send me a PM and I'll give you the link to download. * Sorry, I just updated the photos, previously were wrong ones & in wrong order but doesn't matter much anyway. __________________ Where on earth did you ask? I got mine for 750. Last edited by Drudkh; 14th September 2005 at 12:46 PM.

23rd April 2005	#2
Del_CtrlnoAlt Senior Member Join Date: Feb 2003 Location: Outside the Dry Box. Posts: 16,340	look like some old fotos... btw y there is the L shape flare on the pic? wat lens u use? also, i thought for IR, we use low iso, open aperture den set long exposure? __________________ Logging Off Permanently. Those who need to contact me will know where to contact me.

23rd April 2005	#3
Drudkh Senior Member Join Date: Mar 2004 Location: lulu island Posts: 6,053	it doesn't matter much at what ISO to use. if you follow my previous thread on my first IR test, you'll see the same thing. now, i'm trying to find out why does this happen. __________________ Where on earth did you ask? I got mine for 750.

24th April 2005	#6
tokrot Member Join Date: Jun 2003 Posts: 1,245	Hi Drudkh. please refer to my thread http://forums.clubsnap.org/showthread.php?t=125567 U need some post processing on your Pic... I searched in Dpreview threads and almost every shot with D7D taken look like yours including mine (reflection). So far, I have yet to see anyone successfully converted it to more colorful pic but I will try that again when I am free. __________________ Colors of Photography through my eyes...

23rd April 2005	#4
TME Senior Member Join Date: Jan 2002 Location: Clementi Posts: 6,244	I've never done IR but is it possible to raise the ISO and hence the shutter speed so that the exposure time is shorter? Wonder if that will help... from the shape of the reflection and that they appear at the 4 corners, it looks like light bouncing off the mirror...

24th April 2005	#9
gooseberry Senior Member Join Date: Mar 2004 Location: Central West Posts: 1,925	Hey mate, Hmmm.. interesting. Do you get those same highlights with different lenses ? Looks like those four square highlights in the corners could be due to internal reflection from something - either the lens or double reflection off the sensor or filter pack to the lens and back.