Originally posted by Tord Sitting on an outdoor bar a week ago, takings snaps on a colleage with my K-5 I ran into trouble, I found out later when I looked through the snaps - all pictures were bathed in red colour. There were no red lights there, that night, but IR heaters, and the K-5 sensor saw that IR radiation as red light. So the photos were awash with red light! Some could be saved by turning then into B&W, but some were lost, for ever!
What's the cure, you might ask! Only one company makes an suitable infared filter, and that's Heliopan, a German company! Costs about as much as a non-Ltd lens, but seems to do the job, and does the job as both UV and infrared filter!
Hopefully, these filters will make photographing red objects much simpler, and red flowers will be red flowers, not oversaturated, formless things!
More to come!
Cheers,
Tord
I have been taking pictures of a person with a 2000 W IR heater behind her, and I could see no interference at all from the heater. The ambient light was such that I got a correctly exposed picture with the exposure values 1/8 s, F/4.0 and ISO 1600/32. About half of the heater was shielded by the person in front of it. Distance to person: about 1.5 m, distance to heater: about 3.5 m. In the picture, the heating elements of the heater had the red channel overexposed.
If you had less ambient light, and therefore relatively more IR compared to visible light, that could be a reason why you got problems from the IR heaters when I did not. I used the 18 - 135 WR on my K-5, and I have a 62 mm Hoya HD UV filter attached to it.
/Jonas