I always consider the whole issue of home lens calibration fraught with difficulties and a bit of a dark art. Nasim seems to explain his methods so well giving a good balance between achieving good results and the pitfalls.
I fully understand how a prime can be adjusted and a zoom at one single setting, perhaps the most used setting. This is discussed well and clearly his site is fast becoming a very valuable recourse to the owners of numerous makes of photographic equipment.
Am I correct in thinking that the LensCal he refers to is only available in the US, as I've searched Google and found nothing in the UK.