White Patch, White Patch ...

[Jayson_Ang]

Taken using kit lens 18-55mm, read a lot online that kit lens are usually not suitable for IR shots, in that case, how can I take the white spot away in PS


PS : Just bought Hoya R72 58mm for 50 bucks ... good buy or not?

[deadpixel]

Originally Posted by Jayson_Ang Taken using kit lens 18-55mm, read a lot online that kit lens are usually not suitable for IR shots, in that case, how can I take the white spot away in PS

That white spot is commonly known as a Hot Spot.

You can get rid of it in PS by using the Burn tool, but the best way is not to get it all.

Not all kit lenses are bad, but to avoid this, try not to use too small an aperture. You were shooting at f/5.6, that's not suppose to be too small, but in lenses that have this problem, the usual solution is to shoot wide open.

BTW, long exposures do not necessarily cause hot spots. I've experienced hot spots shooting at 1/500 sec at f/8.

Cheers,
Matt

[Jayson_Ang]

By the way, is there any way to take my infrared shots (with Hoya R72) in a faster shutter speed? Cause most of the time, I leave my camera shutter open for about 5 to 8 seconds with AV 5.6, in bright daylight 12PM to take the shots, if not, I'll get really really underexposed images ...

[deadpixel]

Originally Posted by Jayson_Ang By the way, is there any way to take my infrared shots (with Hoya R72) in a faster shutter speed? Cause most of the time, I leave my camera shutter open for about 5 to 8 seconds with AV 5.6, in bright daylight 12PM to take the shots, if not, I'll get really really underexposed images ...

You're using a Canon 350D that has a pretty strong low pass filter, so there's not much you can do to increase the shutter speed, unless you choose to mod your camera into a pure IR camera.

Cheers,
Matt

[Jayson_Ang]

Geez ... mod to cater only for IR? no thanks man ... I'd rather stick to longer shutter speed
Thanks, for the tip deadpixel

By the way, I've read online that, I must set my custom WB to a patch of grass, so my question is, should I take an overexposed patch of green grass, or normal exposure green grass, for my custom WB

[deadpixel]

Originally Posted by Jayson_Ang Geez ... mod to cater only for IR? no thanks man ... I'd rather stick to longer shutter speed Thanks, for the tip deadpixel By the way, I've read online that, I must set my custom WB to a patch of grass, so my question is, should I take an overexposed patch of green grass, or normal exposure green grass, for my custom WB

Normal...and by normal I mean that it should be sufficient for the camera to capture a decently exposed photo with the filter on, not over and not too much under.

Cheers,
Matt

[DinoT]

Originally Posted by deadpixel That white spot is commonly known as a Hot Spot. You can get rid of it in PS by using the Burn tool, but the best way is not to get it all. Not all kit lenses are bad, but to avoid this, try not to use too small an aperture. You were shooting at f/5.6, that's not suppose to be too small, but in lenses that have this problem, the usual solution is to shoot wide open. BTW, long exposures do not necessarily cause hot spots. I've experienced hot spots shooting at 1/500 sec at f/8. Cheers, Matt

Hi, new to IR. What is or what causes whitespot (hotspot)? I have a prime lens but it "whitespotted". Maybe it is not the quality eh? appreciate ur comments,