gkal

It looks like condensation / fog to me. Were you in an air conditioned environment couple of minutes before your shooting cession ? George

There is no such thing as an unprofitable customer. A customer is a customer no matter what. The day you start to be selective or turn your back to even one customer that's when it will backfire....

In the life of any product you have an initial upward trend with high volume sales and profit, stabilization period and decline. I believe the Photoshop line reached a peak with CS5 and there is...

To begin, fart on the lens first to clean and remove all dust

You know that by using 2 polarizing filters  you can have an infinite neutral density filter values ranging from clear to pitch black. George

I was in Italy for 3 weeks and 95 % of the time the 18-105 was more than adequate. The few times I pulled the Sigma 10-20 was at the fountain of Trevi  and at the Piazza Venezia.