Out of focus problem

[Grevolorio]

Hi guys!!
I need your advice, all my IR shots are out of focus, I'm using a tripod and a timer, still no luck. I've tried with my Canon 10d, my Oly c750 and lately with a Nikon Coolpix 775, which I pulled back out of the drawer becaused I discovered I can shoot IR using spedds of 1/4 - 1/8 ) and I can see the preview in the LCD before I shoot (only in auto mode).
Can you guys tell me what I'm doing wrong?
TIA, Gus

 

[TrailsofLife]

Hi welcome,

Its funny, we have quite a wide variety of different brand camera user here, but other than camera shake and motion blur due to slow shutter, have never encounter out of focus with our camera.

I personally have used Canon 300D, A80, Olympus c5050 & Nikon D70. Normally, will use auto-focus. Never have focus problem.

There's 2 possibilities, check your filter, is it scratched or smugged with grease? Check your cameras, also try auto-focus with filter on.

digi-IR shoot is very easy.

Also, search through this sub-forum on how to shoot IR with Digicam & custom WB.

Hope this help, Cheers!
Max 2.8

 

[sebastiansong]

Could be two possibilities

1)for 10D, try shooting using Manual Focus, i.e., you prefocus before affixing the IR filter. I know its troublesome but you can give it a try

2)use the timer to activate the shutter instead of your finger. It could be possible that when you depress the shutter, the camera register the "shake"

do try out and revert.

 

[ark19]

Hi Grevolorio,
I did encounter some focus prob with A80 in the past, had to use manual focus.... but generally it can do autofocus.

For C700UZ (should be similar to C750) no focusing prob at all.

Maybe you could list down the IR filter/s used and how they are mounted?
:think: sounds like a CSI job

 

[vortex]

or maybe

when its on autofocus with the IR filter on...the lens keep hunting..then it focuses on the wrong point. = out of focus

i experienced that before when i was using the coolpix 8400.

like sebastian has mentioned.....focus and lock it on manual. then attach the IR filter on and shoot.

 

[photoexpress]

Hi Grevolorio,

From what you've described, I have also thought the 2 possibles as sebastian has mentioned. Try either/both steps which might help.

 

[Zerstorer]

On some lenses, IR wavelength diverges from the visible wavelength, hence to get proper IR focus you would have to manually compensate with an offset. For nikon lenses, there is a white spot by the focus window that shows the offset required. This might be a possible point to note if you shots are still turning out blurry after negating all other factors.