rambotk3 wrote in post #12423966
For all of you that have sent in your camera to be converted, did you send in a lens that you knew you were most likely going to use the most with it? I am about to send in a 30D to lifepixel and they said that after they convert it to IR the autofocusing can be a little different so they recommend sending in a lens with it for best results. What do you guys think, would it really make that big of a difference?
Kind of depends on what you're going to shoot. If its big landscapes or "scenes" in general then you probably wont see much difference. I usually stop down to f/9, shift the focus back from the infinity stop a fraction and shoot away.
If you're going to be taking images of things fairly close, plants for example then you may notice a problem. You can always get round it by switching to manual focus and over time getting used to where the focus actually is versus where the focus appears to be in the viewfinder (I *think* the IR plane of focus lies behind the subject - i.e. further away from you than the visible light plane of focus - but I could have remembered that wrong
Gotta be a bit wary of calibrating the camera for infrared as different lenses focus in different ways - I think this only applies to Ultra Wide Angle zooms. For example a camera calibrated for infrared on a 50mm will not focus correctly when a 10-22 is used (and vice versa).
I suppose at the end of it, if you know which lens you're going to use and you're only going to use that one for infrared, send it in with the camera else just stop down and shoot away.
For info, I have a converted 400D and that was calibrated to a nifty-fifty. However I only use a 17-40 on it and I've had no issues. I also pretty much only shoot f/8-11 and in bright daylight so I wouldnt really notice to many focus issues. And also blurry backgrounds dont seem to work as well with infrared so I dont go after shallow DoF shots.
Hope this helps.