A lens can be calibrated to a camera for focus though I believe this is most applicable to a DSLR conversion moreso than a mirrorless camera. Regardless, some lenses simply are not suitable for IR because of their design or internal coatings may lend to hot spots or flare, which can be exhibited to varying degrees at different apertures and/or focal lengths if using a zoom.
I had two Sony A7r bodies converted to full spectrum by Life Pixel---and both operated well. But I feel Life Pixel is simply "harder" on the camera bodies when they get them on the bench. Both cameras were scratched in exactly the same spot on the LCD when I received the cameras back. The damage looked like a rub mark about the size of a dime. I had protective covers so damage was avoided but I had to foot the bill to replace the covers.
I subsequently thought I would upgrade my Sony Zeiss 24-70 to the (new at the time) Sony G 24-70, a much more expensive lens. Severe hot spot in the middle was noted at some settings. Very disappointed in the lens after spending $$$, but that's the risk in IR/FS if a new lens is not in the lens-use IR database----you get to be the guinea pig.
I then sent in the Sony A7r FS and had it re-converted again by Kolari Vision to full spectrum with their AR coating option. I was surprised that the hot spots on the Sony G 24-70 were greatly diminished, though not entirely---it was a noticeable improvement. I'm sold on the AR option----it is mandatory for me (if offered). I like Kolari's new pro line of thin filters as well for IR and hot mirror filters.
A lens can be calibrated to a camera for focus though I believe this is most applicable to a DSLR conversion moreso than a mirrorless camera. Regardless, some lenses simply are not suitable for IR because of their design or internal coatings may lend to hot spots or flare, which can be exhibited to varying degrees at different apertures and/or focal lengths if using a zoom.
I had two Sony A7r bodies converted to full spectrum by Life Pixel---and both operated well. But I feel Life Pixel is simply "harder" on the camera bodies when they get them on the bench. Both cameras were scratched in exactly the same spot on the LCD when I received the cameras back. The damage looked like a rub mark about the size of a dime. I had protective covers so damage was avoided but I had to foot the bill to replace the covers.
I subsequently thought I would upgrade my Sony Zeiss 24-70 to the (new at the time) Sony G 24-70, a much more expensive lens. Severe hot spot in the middle was noted at some settings. Very disappointed in the lens after spending $$$, but that's the risk in IR/FS if a new lens is not in the lens-use IR database----you get to be the guinea pig.
I then sent in the Sony A7r FS and had it re-converted again my Kolari Vision to full spectrum with their AR coating option. I was surprised that the hot spots on the Sony G 24-70 were greatly diminished, though not entirely---it was a noticeable improvement. I'm sold on the AR option----it is mandatory for me (if offered). I like Kolari's new pro line of thin filters as well for IR and hot mirror filters.
Hope that helps.
Ken
Apr 01, 2019 at 07:39 AM
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