Would jitter do the same?  It seems focal blur is:
1. relatively expensive
2. introduces an artifact, as it's depth-dependent

Jaime Vives Piqueres wrote:
>   A quick note about something I just discovered...
> 
>   When using two-pass radiosity, if you use a little focal blur during the
> first pass (just a few blur samples is enough), the you can scale up the
> render size on the second pass without suffering the typical artefacts 
> (and you don't need to use focal blur on the final pass).
> 
>   I've used this trick successfully with the first pass at 320x240 and 
> the second at 1024x768. So, for the first pass I'm now using that in the 
> camera:
> 
>   aperture .01 blur_samples 7 focal_point <,,>
> 
>   Regards,
> 
> -- 
> Jaime

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