I love Infra-Red Photography

[PhotosbyChuck]

Originally Posted by rsimon

I added 2 new pictures to my Infra-red Album. 1 showing no conversion and the other showing it after. I used this picture to show another common problem in Infra-Red photography, using filters, the spot in the middle which is either from the sun or possibly a speck of dust that got on the filter as the picture was taken. The longer time exposures does alow this to happen and I clean the filter prior to every shot and it still happens. The sun is unpredictable since you cannot see it until after the shot has been taken, but sometimes it gives a great effect also, but that is rare.

The spot is a photo of your lens iris -- so it's not dust. Most likely flare caused by a reflection off of the water.

[rsimon]

Never thought of that, I do not get it very often and there have been times when it appears in 1 photo and not in another without moving the camera so I always assumed that it was something on the lens. I have other examaples where there arem MANY on these spots and after cleaning the filter they go away. But after relooking at the spot in this picture I have to agree that it could be a reflection. Thanks

[PhotosbyChuck]

Originally Posted by rsimon

Never thought of that, I do not get it very often and there have been times when it appears in 1 photo and not in another without moving the camera so I always assumed that it was something on the lens. I have other examaples where there arem MANY on these spots and after cleaning the filter they go away. But after relooking at the spot in this picture I have to agree that it could be a reflection. Thanks

Sure. Dust will never give you that shape. That shape is always due to stray light entering the lens. If you are pointing your camera at a light source (including water reflecting light) you're much more likely to see it. With an IR filter on the lens, it's tough to know it will be there in the viewfinder tho!