First IR try with 400D

[wanzw]

taken with 50mm 1.8 with R72.

PP done was according to max2.8's instruction. have not much time to experiment because of various assignments coming this week. will use it more often after that.

anyway.



taken in hwa chong JC. lol.

looks OOF. i guess i will need to focus without the filter then shoot with R72 on. shall try it soon enough

[TrailsofLife]

Originally Posted by wanzw taken with 50mm 1.8 with R72. PP done was according to max2.8's instruction. have not much time to experiment because of various assignments coming this week. will use it more often after that. anyway. taken in hwa chong JC. lol. looks OOF. i guess i will need to focus without the filter then shoot with R72 on. shall try it soon enough

Focus looks fine at this size. How's the exposure? Shutter speed, aperture, ISO?

[wanzw]

shutter speed is 30 sec, aperture is 7.1 ISO is 100.

[TrailsofLife]

Originally Posted by wanzw shutter speed is 30 sec, aperture is 7.1 ISO is 100.

Not too bad....That means if you use f5.6, ISO200 or even 400, you should shorten your exposures to about 8 secs...

Make use of the low noise high ISO of Canon's sensor, can go higher ISO to shorten the exposure time.

Should be fine.

[wanzw]

will try iso 200 and 5.6 with around 6 second. see how

[matrixneo]

nice...snow in sg...hehehe

[mohgui]

wah... 30sec exposure for a daytime shot is too long. is this inherent to canon lenses?

[adamadam]

Originally Posted by mohgui wah... 30sec exposure for a daytime shot is too long. is this inherent to canon lenses?

For IR with an unmodified Canon I think this is normal.

[JoshSiao]

Originally Posted by mohgui wah... 30sec exposure for a daytime shot is too long. is this inherent to canon lenses?

Not the lens lol! Its the super-duper hot-mirror filter in front of the sensor.

[wanzw]

Originally Posted by JoshSiao Not the lens lol! Its the super-duper hot-mirror filter in front of the sensor.

dun understand what you are talking about. care to share?

yes camera is not modified. filter only.

[TrailsofLife]

hot mirrors are supposed to block away unwanted light in the spectrum like ultra-violet and infra-red so your image won't be contaminated by them. Although so, some infrared and ultraviolet light will still be recorded in a prolonged exposure.

So in order record infrared light with the hot mirror on, a IR pass filter like Hoya R72, is used to block away visible light, allowing only IR light to pass through. But because of the hot mirror blocking the IR light, a longer exposure is need to record IR light.

Hope this is layman enough.

[denniskee]

Originally Posted by wanzw looks OOF. i guess i will need to focus without the filter then shoot with R72 on. shall try it soon enough

for ir photography, the focus line indicator is futher away from the normal one you use. take a closer look on your lens, you should be able to find it.

[deadpixel]

Originally Posted by denniskee for ir photography, the focus line indicator is futher away from the normal one you use. take a closer look on your lens, you should be able to find it.

Not all lenses, especially the newer ones, have this IR focus line indicator.

Cheers,
Matt

[wanzw]

Originally Posted by denniskee for ir photography, the focus line indicator is futher away from the normal one you use. take a closer look on your lens, you should be able to find it.

that's true. is it ok for the camera do to AF by itself when the IR filter is attached?

[deadpixel]

Originally Posted by wanzw that's true. is it ok for the camera do to AF by itself when the IR filter is attached?

It is, but then not all cameras can AF with the IR filter in place.

Cheers,
Matt