Quote: The meter is balanced for visible light with an average colour temperature (daylight) and will almost certainly misread when the visible light is removed with a "black" IR filter. I think you're going to have to bracket, it would make most sense to meter without the filter & work from that, I'd suggest trying -1 -2 -3 stops find out which one looks best & refine from
I have done so, but it seems that I on average underexposed for about 5 stops, just looking at the pics now. The Sigma does have an issue though, when you use the wrong white balance. Even in normal photography it is imperative that you use the right white balance settings.Correction is difficult if you don't and can lead to increased noise at times, which I think it may have been one of the contributing factors.
Quote: Softness - have you remembered to correct the focus by using the distance scale visible & IR indices? It may help to stop right down but getting the right focus in the first place is surely the key.
The lenses I used apart from one did not have the IR index scale but the Sigma SD10 without the hotmirror does a great job autofocussing through the IR filter I have to say,the softness was introduced because of the excess noise and the subsequent use of Noise Reduction software. I have a few that survived and here's one:
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