[Casey1721]

I have the f4 10-20 lens, very pleased with it, this is a bit off the subject but interesting. i had a Canon 40d converted to infrared with a 720nm filter put in, i tried the 10-20 on IR and it was rubbish, so i left it for a while, then a couple of months later i went out with the IR camera and when i got the camera out i was horrified, i still had the sigma on it. so i went ahead and spent the day taking shots but thinking i was wasting my time, but some of the best IR shots i have ever done were there, i had to make another set of actions to get the effects i wanted, and got some effects i did not bargain on, i was at park in October, one amazing effect i got was a shot of a tree and white bridge over a stream with almost natural range of colors, its half IR and half "normal" it seems it does not like the summer IR very smeared near the frame edges. lots to do to get used to these random effects.